TY  - JOUR
AU  - Tošić, Miloš
AU  - Rajić, Vladimir
AU  - Pjević, Dejan
AU  - Stojadinović, Stevan
AU  - Krstulović, Nikša
AU  - Dimitrijević-Branković, Suzana
AU  - Momčilović, Miloš
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13091
AB  - This study proposes a simple and controlled method for producing TiO2 with phase junction, oxygen vacancies, and Ti3+ by combining picosecond pulsed laser irradiation and electrochemical anodization. Ti mesh was pretreated by irradiating with a picosecond pulsed laser technique using an Nd:YAG laser (1064 nm) at two fluencies, 15 J/cm2 and 30 J/cm2 . The samples were then subjected to electrochemical anodization to form TiO2 nanotube arrays on the previously laser-treated surface. This study will investigate the possibility of forming TiO2 nanotube arrays on a pre-laser-treated Ti substrate and determine their physicochemical and photocatalytic properties. The samples were characterized by FESEM, XRD, Raman, XPS, and UV-Vis DRS. UV-Vis spectroscopy was used to observe the progress of photocatalytic degradation for all samples, and degradation products were determined using GC-MS. With the synergistic effects of phase junction, oxygen vacancies, and Ti3+, the laser-treated TiO2 with 30 J/cm2 showed a higher photocatalytic degradation rate (85.1%) of the pesticide carbofuran compared to non-laser-treated TiO2 (54.8%), remaining stable during successive degradation cycles, which has promising practical applications.
T2  - Photonics
T1  - Synergy of Nd:YAG Picosecond Pulsed Laser Irradiation and Electrochemical Anodization in the Formation of TiO2 Nanostructures for the Photocatalytic Degradation of Pesticide Carbofuran
VL  - 11
IS  - 3
SP  - 284
DO  - 10.3390/photonics11030284
ER  - 

@article{
author = "Tošić, Miloš and Rajić, Vladimir and Pjević, Dejan and Stojadinović, Stevan and Krstulović, Nikša and Dimitrijević-Branković, Suzana and Momčilović, Miloš",
year = "2024",
abstract = "This study proposes a simple and controlled method for producing TiO2 with phase junction, oxygen vacancies, and Ti3+ by combining picosecond pulsed laser irradiation and electrochemical anodization. Ti mesh was pretreated by irradiating with a picosecond pulsed laser technique using an Nd:YAG laser (1064 nm) at two fluencies, 15 J/cm2 and 30 J/cm2 . The samples were then subjected to electrochemical anodization to form TiO2 nanotube arrays on the previously laser-treated surface. This study will investigate the possibility of forming TiO2 nanotube arrays on a pre-laser-treated Ti substrate and determine their physicochemical and photocatalytic properties. The samples were characterized by FESEM, XRD, Raman, XPS, and UV-Vis DRS. UV-Vis spectroscopy was used to observe the progress of photocatalytic degradation for all samples, and degradation products were determined using GC-MS. With the synergistic effects of phase junction, oxygen vacancies, and Ti3+, the laser-treated TiO2 with 30 J/cm2 showed a higher photocatalytic degradation rate (85.1%) of the pesticide carbofuran compared to non-laser-treated TiO2 (54.8%), remaining stable during successive degradation cycles, which has promising practical applications.",
journal = "Photonics",
title = "Synergy of Nd:YAG Picosecond Pulsed Laser Irradiation and Electrochemical Anodization in the Formation of TiO2 Nanostructures for the Photocatalytic Degradation of Pesticide Carbofuran",
volume = "11",
number = "3",
pages = "284",
doi = "10.3390/photonics11030284"
}

Tošić, M., Rajić, V., Pjević, D., Stojadinović, S., Krstulović, N., Dimitrijević-Branković, S.,& Momčilović, M.. (2024). Synergy of Nd:YAG Picosecond Pulsed Laser Irradiation and Electrochemical Anodization in the Formation of TiO2 Nanostructures for the Photocatalytic Degradation of Pesticide Carbofuran. in Photonics, 11(3), 284.
https://doi.org/10.3390/photonics11030284

Tošić M, Rajić V, Pjević D, Stojadinović S, Krstulović N, Dimitrijević-Branković S, Momčilović M. Synergy of Nd:YAG Picosecond Pulsed Laser Irradiation and Electrochemical Anodization in the Formation of TiO2 Nanostructures for the Photocatalytic Degradation of Pesticide Carbofuran. in Photonics. 2024;11(3):284.
doi:10.3390/photonics11030284 .

Tošić, Miloš, Rajić, Vladimir, Pjević, Dejan, Stojadinović, Stevan, Krstulović, Nikša, Dimitrijević-Branković, Suzana, Momčilović, Miloš, "Synergy of Nd:YAG Picosecond Pulsed Laser Irradiation and Electrochemical Anodization in the Formation of TiO2 Nanostructures for the Photocatalytic Degradation of Pesticide Carbofuran" in Photonics, 11, no. 3 (2024):284,
https://doi.org/10.3390/photonics11030284 . .

TY  - JOUR
AU  - Ahmetović, Sanita
AU  - Vasiljević, Zorka Ž.
AU  - Rajić, Vladimir
AU  - Bartolić, Dragana
AU  - Novaković, Mirjana M.
AU  - Tadić, Nenad B.
AU  - Cvjetićanin, Nikola
AU  - Nikolić, Maria Vesna
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10448
AB  - Pure and samarium (Sm3+) - or zirconium (Zr4+)-doped TiO2 nanofibers were synthesized by electrospinning method followed by calcination at 500 °C for 1 h. As-spun fibers were smooth, straight and continuous, whilst EDS analysis confirmed the fiber composition and incorporation of dopants in the fibers. Doping with Sm3+ and Zr4+ greatly inhibited the phase transformation of anatase to rutile, by surrounding of Sm3+ ions through formation of Ti-O-Sm bonds and by replacement of Ti4+ ions with larger Zr4+ ions. This was confirmed by HRTEM and SAED analysis. The size of nanofibers was determined to be 133 nm, 175 nm and 155 nm for pure, (0.5%)Sm3+:TiO2 and (1%)Zr4+:TiO2, respectively. After calcination, TiO2 crystal lattice with interplanar spacing of 0.353 nm of (101) crystal plane was not significantly disturbed by Sm doping whilst crystal lattice spacing of 0.357 nm of (101) planes of anatase phase in case TiO2:1.0%Zr4+, significantly differs from the value of pure TiO2 (0.352 nm), thus implying that Zr was doped into substitutional sites of the TiO2 lattice. The indirect band gaps were calculated to be in the range 3.07–3.24 eV. TiO2:0.5%Sm3+ and TiO2:1.0%Zr4+ exhibited higher specific surface area, of 47.1 and 59.4 m2/g, respectively, than pure TiO2 fibers (19.7 m2/g). Effects of Sm3+ and Zr4+ dopant content on the photodegradation efficiency of methylene blue (MB) were studied. TiO2:0.5%Sm3+ and TiO2:1.0%Zr4+ nanofibers have shown the highest photocatalytic activity of 97% and 98% with constant rates 0.01768 min−1 and 0.01939 min−1, respectively, within180 min irradiation under visible light.
T2  - Journal of Alloys and Compounds
T1  - Examination of the doping effects of samarium (Sm3+) and zirconium (Zr4+) on the photocatalytic activity of TiO2 nanofibers
VL  - 930
SP  - 167423
DO  - 10.1016/j.jallcom.2022.167423
ER  - 

@article{
author = "Ahmetović, Sanita and Vasiljević, Zorka Ž. and Rajić, Vladimir and Bartolić, Dragana and Novaković, Mirjana M. and Tadić, Nenad B. and Cvjetićanin, Nikola and Nikolić, Maria Vesna",
year = "2023",
abstract = "Pure and samarium (Sm3+) - or zirconium (Zr4+)-doped TiO2 nanofibers were synthesized by electrospinning method followed by calcination at 500 °C for 1 h. As-spun fibers were smooth, straight and continuous, whilst EDS analysis confirmed the fiber composition and incorporation of dopants in the fibers. Doping with Sm3+ and Zr4+ greatly inhibited the phase transformation of anatase to rutile, by surrounding of Sm3+ ions through formation of Ti-O-Sm bonds and by replacement of Ti4+ ions with larger Zr4+ ions. This was confirmed by HRTEM and SAED analysis. The size of nanofibers was determined to be 133 nm, 175 nm and 155 nm for pure, (0.5%)Sm3+:TiO2 and (1%)Zr4+:TiO2, respectively. After calcination, TiO2 crystal lattice with interplanar spacing of 0.353 nm of (101) crystal plane was not significantly disturbed by Sm doping whilst crystal lattice spacing of 0.357 nm of (101) planes of anatase phase in case TiO2:1.0%Zr4+, significantly differs from the value of pure TiO2 (0.352 nm), thus implying that Zr was doped into substitutional sites of the TiO2 lattice. The indirect band gaps were calculated to be in the range 3.07–3.24 eV. TiO2:0.5%Sm3+ and TiO2:1.0%Zr4+ exhibited higher specific surface area, of 47.1 and 59.4 m2/g, respectively, than pure TiO2 fibers (19.7 m2/g). Effects of Sm3+ and Zr4+ dopant content on the photodegradation efficiency of methylene blue (MB) were studied. TiO2:0.5%Sm3+ and TiO2:1.0%Zr4+ nanofibers have shown the highest photocatalytic activity of 97% and 98% with constant rates 0.01768 min−1 and 0.01939 min−1, respectively, within180 min irradiation under visible light.",
journal = "Journal of Alloys and Compounds",
title = "Examination of the doping effects of samarium (Sm3+) and zirconium (Zr4+) on the photocatalytic activity of TiO2 nanofibers",
volume = "930",
pages = "167423",
doi = "10.1016/j.jallcom.2022.167423"
}

Ahmetović, S., Vasiljević, Z. Ž., Rajić, V., Bartolić, D., Novaković, M. M., Tadić, N. B., Cvjetićanin, N.,& Nikolić, M. V.. (2023). Examination of the doping effects of samarium (Sm3+) and zirconium (Zr4+) on the photocatalytic activity of TiO2 nanofibers. in Journal of Alloys and Compounds, 930, 167423.
https://doi.org/10.1016/j.jallcom.2022.167423

Ahmetović S, Vasiljević ZŽ, Rajić V, Bartolić D, Novaković MM, Tadić NB, Cvjetićanin N, Nikolić MV. Examination of the doping effects of samarium (Sm3+) and zirconium (Zr4+) on the photocatalytic activity of TiO2 nanofibers. in Journal of Alloys and Compounds. 2023;930:167423.
doi:10.1016/j.jallcom.2022.167423 .

Ahmetović, Sanita, Vasiljević, Zorka Ž., Rajić, Vladimir, Bartolić, Dragana, Novaković, Mirjana M., Tadić, Nenad B., Cvjetićanin, Nikola, Nikolić, Maria Vesna, "Examination of the doping effects of samarium (Sm3+) and zirconium (Zr4+) on the photocatalytic activity of TiO2 nanofibers" in Journal of Alloys and Compounds, 930 (2023):167423,
https://doi.org/10.1016/j.jallcom.2022.167423 . .

TY  - JOUR
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
AU  - Rajić, Vladimir
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10575
AB  - The present paper investigates the effects of thermal annealing on the structural and magnetic properties of Co thin films. The films were prepared by using electron-beam evaporation method onto Si (100) wafers and annealed in vacuum at 200 °C, 300 °C and 400 °C. A combination of X-ray diffraction, Rutherford backscattering spectrometry, X-ray photoelectron spectroscopy, transmission electron microscopy and energy-dispersive X-ray spectrometry were used to characterize structural properties and the composition of the films, while magnetic behavior was studied by magneto-optical Kerr effect measurements. It was found that as deposited Co layer show predominantly uniaxial magnetic anisotropy, while after annealing at 200 °C and 300 °C a strong influence of fourfold contribution is observed, which is assigned to the thermally induced HCP→FCC phase transition. With further increase in annealing temperature of 400 °C the isotropic contribution becomes the main component of magnetization. Besides, a strong variation in coercive field with annealing temperature was observed, where the coercivity seems to depend closely on the crystallite size. The highest value of HC equals ∼70 Oe and was found for the temperature of 400 °C, where also mixing at the interface has started and formation of CoSi was observed.
T2  - Journal of Alloys and Compounds
T1  - Study on the structural and magnetic properties of e-beam evaporated Co thin films annealed in vacuum
VL  - 937
SP  - 168411
DO  - 10.1016/j.jallcom.2022.168411
ER  - 

@article{
author = "Novaković, Mirjana M. and Popović, Maja and Rajić, Vladimir",
year = "2023",
abstract = "The present paper investigates the effects of thermal annealing on the structural and magnetic properties of Co thin films. The films were prepared by using electron-beam evaporation method onto Si (100) wafers and annealed in vacuum at 200 °C, 300 °C and 400 °C. A combination of X-ray diffraction, Rutherford backscattering spectrometry, X-ray photoelectron spectroscopy, transmission electron microscopy and energy-dispersive X-ray spectrometry were used to characterize structural properties and the composition of the films, while magnetic behavior was studied by magneto-optical Kerr effect measurements. It was found that as deposited Co layer show predominantly uniaxial magnetic anisotropy, while after annealing at 200 °C and 300 °C a strong influence of fourfold contribution is observed, which is assigned to the thermally induced HCP→FCC phase transition. With further increase in annealing temperature of 400 °C the isotropic contribution becomes the main component of magnetization. Besides, a strong variation in coercive field with annealing temperature was observed, where the coercivity seems to depend closely on the crystallite size. The highest value of HC equals ∼70 Oe and was found for the temperature of 400 °C, where also mixing at the interface has started and formation of CoSi was observed.",
journal = "Journal of Alloys and Compounds",
title = "Study on the structural and magnetic properties of e-beam evaporated Co thin films annealed in vacuum",
volume = "937",
pages = "168411",
doi = "10.1016/j.jallcom.2022.168411"
}

Novaković, M. M., Popović, M.,& Rajić, V.. (2023). Study on the structural and magnetic properties of e-beam evaporated Co thin films annealed in vacuum. in Journal of Alloys and Compounds, 937, 168411.
https://doi.org/10.1016/j.jallcom.2022.168411

Novaković MM, Popović M, Rajić V. Study on the structural and magnetic properties of e-beam evaporated Co thin films annealed in vacuum. in Journal of Alloys and Compounds. 2023;937:168411.
doi:10.1016/j.jallcom.2022.168411 .

Novaković, Mirjana M., Popović, Maja, Rajić, Vladimir, "Study on the structural and magnetic properties of e-beam evaporated Co thin films annealed in vacuum" in Journal of Alloys and Compounds, 937 (2023):168411,
https://doi.org/10.1016/j.jallcom.2022.168411 . .

TY  - JOUR
AU  - Popović, Maja
AU  - Novaković, Mirjana M.
AU  - Vaňa, Dušan
AU  - Ronning, Carsten
AU  - Jugović, Dragana
AU  - Rajić, Vladimir
AU  - Noga, Pavol
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10746
AB  - Titanium nitride (TiN) is an attractive alternative for modern and future photonic applications, as its optical properties can be engineered over a wide spectral range. In this study, we have used sequential implantation of gold and silver ions with varying ion fluence, as well as subsequent annealing, in order to modify the optical and plasmonic properties of TiN thin films and correlated this to their structural properties. Our investigations show that the columnar structure of the TiN films is partially destroyed upon implantation, but metallic Au and Ag nanoparticles are formed. The irradiation further induces a reduction of the lattice constant as well as changes the TiN stoichiometry and grain size. From the optical point of view, the implanted films possess less metallicity with increasing Ag fluence and losses several times lower than the as-deposited film, which can be correlated with the deficiency of nitrogen and additional defects. Subsequent annealing partially recovered the destroyed columnar structure, and the films become more metallic where the optical losses are much smaller in comparison to the as-implanted situation, being comparable to those of pure Au and Ag. In this way, by varying the implantation fluence of silver ions properly while keeping the gold fluence constant, we were able to optimize experimental parameters in such a way to ensure the formation of TiN with desirable optical performances.
T2  - Optical Materials
T1  - Structure-dependent optical properties of Au/Ag irradiated TiN thin films
VL  - 138
SP  - 113684
DO  - 10.1016/j.optmat.2023.113684
UR  - https://hdl.handle.net/21.15107/rcub_dais_14289
ER  - 

@article{
author = "Popović, Maja and Novaković, Mirjana M. and Vaňa, Dušan and Ronning, Carsten and Jugović, Dragana and Rajić, Vladimir and Noga, Pavol",
year = "2023",
abstract = "Titanium nitride (TiN) is an attractive alternative for modern and future photonic applications, as its optical properties can be engineered over a wide spectral range. In this study, we have used sequential implantation of gold and silver ions with varying ion fluence, as well as subsequent annealing, in order to modify the optical and plasmonic properties of TiN thin films and correlated this to their structural properties. Our investigations show that the columnar structure of the TiN films is partially destroyed upon implantation, but metallic Au and Ag nanoparticles are formed. The irradiation further induces a reduction of the lattice constant as well as changes the TiN stoichiometry and grain size. From the optical point of view, the implanted films possess less metallicity with increasing Ag fluence and losses several times lower than the as-deposited film, which can be correlated with the deficiency of nitrogen and additional defects. Subsequent annealing partially recovered the destroyed columnar structure, and the films become more metallic where the optical losses are much smaller in comparison to the as-implanted situation, being comparable to those of pure Au and Ag. In this way, by varying the implantation fluence of silver ions properly while keeping the gold fluence constant, we were able to optimize experimental parameters in such a way to ensure the formation of TiN with desirable optical performances.",
journal = "Optical Materials",
title = "Structure-dependent optical properties of Au/Ag irradiated TiN thin films",
volume = "138",
pages = "113684",
doi = "10.1016/j.optmat.2023.113684",
url = "https://hdl.handle.net/21.15107/rcub_dais_14289"
}

Popović, M., Novaković, M. M., Vaňa, D., Ronning, C., Jugović, D., Rajić, V.,& Noga, P.. (2023). Structure-dependent optical properties of Au/Ag irradiated TiN thin films. in Optical Materials, 138, 113684.
https://doi.org/10.1016/j.optmat.2023.113684
https://hdl.handle.net/21.15107/rcub_dais_14289

Popović M, Novaković MM, Vaňa D, Ronning C, Jugović D, Rajić V, Noga P. Structure-dependent optical properties of Au/Ag irradiated TiN thin films. in Optical Materials. 2023;138:113684.
doi:10.1016/j.optmat.2023.113684
https://hdl.handle.net/21.15107/rcub_dais_14289 .

Popović, Maja, Novaković, Mirjana M., Vaňa, Dušan, Ronning, Carsten, Jugović, Dragana, Rajić, Vladimir, Noga, Pavol, "Structure-dependent optical properties of Au/Ag irradiated TiN thin films" in Optical Materials, 138 (2023):113684,
https://doi.org/10.1016/j.optmat.2023.113684 .,
https://hdl.handle.net/21.15107/rcub_dais_14289 .

TY  - CONF
AU  - Ahmetović, Sanita
AU  - Vasiljević, Zorka Ž.
AU  - Rajić, Vladimir
AU  - Bartolić, Dragana
AU  - Novaković, Mirjana
AU  - Tadić, Nenad
AU  - Cvjetićanin, Nikola
AU  - Nikolić, Maria Vesna
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11747
AB  - In this work, titanium dioxide (TiO2) nanofibers doped with 0.5–5 mol% zirconium ions (Zr4+) were synthesized by combining the sol-gel process and electrospinning method, and calcined at 500 °C. The morphological, structural and optical properties of pure and Zr-doped TiO2 nanofibers were investigated. According to the XRD and FTIR analyses, the addition of Zr as a dopant suppressed the transformation of anatase to rutile phase. Scanning electron microscopy showed that all fibers were smooth, fragile and randomly oriented after the calcination process. HRTEM analysis revealed that Zr4+ ions were incorporated at the substitutional sites in the anatase TiO2 crystalline lattice. The photocatalytic efficiency for degradation of methylene blue (MB) was examined for both pure and Zr-doped TiO2 samples. Nanofibers doped with 1% of Zr4+ ions have shown the highest photocatalytic activity of 98%, wich can be explained by considering lower PL intensity in the PL spectrum of this sample, indicating suppressed electron-hole recombination.
PB  - Novi Sad : Faculty of Technology, University of Novi Sad
C3  - CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, programme and book of abstracts; Oct 11-14, Novi Sad
T1  - Investigating the effects of Zr doping on the titanium dioxide nanofibres
SP  - 134
EP  - 134
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11747
ER  - 

@conference{
author = "Ahmetović, Sanita and Vasiljević, Zorka Ž. and Rajić, Vladimir and Bartolić, Dragana and Novaković, Mirjana and Tadić, Nenad and Cvjetićanin, Nikola and Nikolić, Maria Vesna",
year = "2023",
abstract = "In this work, titanium dioxide (TiO2) nanofibers doped with 0.5–5 mol% zirconium ions (Zr4+) were synthesized by combining the sol-gel process and electrospinning method, and calcined at 500 °C. The morphological, structural and optical properties of pure and Zr-doped TiO2 nanofibers were investigated. According to the XRD and FTIR analyses, the addition of Zr as a dopant suppressed the transformation of anatase to rutile phase. Scanning electron microscopy showed that all fibers were smooth, fragile and randomly oriented after the calcination process. HRTEM analysis revealed that Zr4+ ions were incorporated at the substitutional sites in the anatase TiO2 crystalline lattice. The photocatalytic efficiency for degradation of methylene blue (MB) was examined for both pure and Zr-doped TiO2 samples. Nanofibers doped with 1% of Zr4+ ions have shown the highest photocatalytic activity of 98%, wich can be explained by considering lower PL intensity in the PL spectrum of this sample, indicating suppressed electron-hole recombination.",
publisher = "Novi Sad : Faculty of Technology, University of Novi Sad",
journal = "CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, programme and book of abstracts; Oct 11-14, Novi Sad",
title = "Investigating the effects of Zr doping on the titanium dioxide nanofibres",
pages = "134-134",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11747"
}

Ahmetović, S., Vasiljević, Z. Ž., Rajić, V., Bartolić, D., Novaković, M., Tadić, N., Cvjetićanin, N.,& Nikolić, M. V.. (2023). Investigating the effects of Zr doping on the titanium dioxide nanofibres. in CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, programme and book of abstracts; Oct 11-14, Novi Sad
Novi Sad : Faculty of Technology, University of Novi Sad., 134-134.
https://hdl.handle.net/21.15107/rcub_vinar_11747

Ahmetović S, Vasiljević ZŽ, Rajić V, Bartolić D, Novaković M, Tadić N, Cvjetićanin N, Nikolić MV. Investigating the effects of Zr doping on the titanium dioxide nanofibres. in CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, programme and book of abstracts; Oct 11-14, Novi Sad. 2023;:134-134.
https://hdl.handle.net/21.15107/rcub_vinar_11747 .

Ahmetović, Sanita, Vasiljević, Zorka Ž., Rajić, Vladimir, Bartolić, Dragana, Novaković, Mirjana, Tadić, Nenad, Cvjetićanin, Nikola, Nikolić, Maria Vesna, "Investigating the effects of Zr doping on the titanium dioxide nanofibres" in CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, programme and book of abstracts; Oct 11-14, Novi Sad (2023):134-134,
https://hdl.handle.net/21.15107/rcub_vinar_11747 .

TY  - CONF
AU  - Božinović, Nevena
AU  - Petrović, Suzana
AU  - Novaković, Mirjana
AU  - Rajić, Vladimir
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12323
AB  - In scientific and commericial needs, there was a great demand for the modification of biomaterials that would replace damaged tissue in the body. Today, titanium alloys are mostly used for these purposes in combination with metals of similar physicochemical properties. In this context, there is an increased interest in the development of novel biocompatible materials with enhanced surface interface. The experimental results of a Ti/Zr/Ti thin film system deposited on a substrate pre-patterned by a dynamic femtosecond laser are presented. Surface pattering with micrometre characteristics in the form of spikes is being investigated in order to generate arrayed surface patterns for biomedical pruposes. Femtosecond laser pulses were used to acquire black silicon surfaces adorned with conical structures under 0,65 bar in SF6 ambient pressure. The silicon surface contains high aspect ratio spikes with conical morphologies of about 2μm, 400 angle opening, and 13·106 cm-2 density that is roughly uniform over the treatment area. Ion sputtering was employed on sech a prepared surface to make a unique composite thin film composed of two layers of Ti and a subsurface layer of Zr. The deposited Ti/Zr/Ti cpomiste has a thickness of 400 nm. The composition and surface morphology were evaluated using FESEM-EDS and XPS methods. Transmission electron spectroscopy and energy dispersive X-ray spectroscopy demonstrated that post-deposition of Ti/Zr/Ti over Si laser-patterned resulted in diffusion of Ti and Zr layers.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
T1  - Thin film deposition of multilayers on silicon substrate laser pre-patterned
SP  - 51
EP  - 51
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12323
ER  - 

@conference{
author = "Božinović, Nevena and Petrović, Suzana and Novaković, Mirjana and Rajić, Vladimir",
year = "2023",
abstract = "In scientific and commericial needs, there was a great demand for the modification of biomaterials that would replace damaged tissue in the body. Today, titanium alloys are mostly used for these purposes in combination with metals of similar physicochemical properties. In this context, there is an increased interest in the development of novel biocompatible materials with enhanced surface interface. The experimental results of a Ti/Zr/Ti thin film system deposited on a substrate pre-patterned by a dynamic femtosecond laser are presented. Surface pattering with micrometre characteristics in the form of spikes is being investigated in order to generate arrayed surface patterns for biomedical pruposes. Femtosecond laser pulses were used to acquire black silicon surfaces adorned with conical structures under 0,65 bar in SF6 ambient pressure. The silicon surface contains high aspect ratio spikes with conical morphologies of about 2μm, 400 angle opening, and 13·106 cm-2 density that is roughly uniform over the treatment area. Ion sputtering was employed on sech a prepared surface to make a unique composite thin film composed of two layers of Ti and a subsurface layer of Zr. The deposited Ti/Zr/Ti cpomiste has a thickness of 400 nm. The composition and surface morphology were evaluated using FESEM-EDS and XPS methods. Transmission electron spectroscopy and energy dispersive X-ray spectroscopy demonstrated that post-deposition of Ti/Zr/Ti over Si laser-patterned resulted in diffusion of Ti and Zr layers.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts",
title = "Thin film deposition of multilayers on silicon substrate laser pre-patterned",
pages = "51-51",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12323"
}

Božinović, N., Petrović, S., Novaković, M.,& Rajić, V.. (2023). Thin film deposition of multilayers on silicon substrate laser pre-patterned. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
Belgrade : Institute of Technical Sciences of SASA., 51-51.
https://hdl.handle.net/21.15107/rcub_vinar_12323

Božinović N, Petrović S, Novaković M, Rajić V. Thin film deposition of multilayers on silicon substrate laser pre-patterned. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts. 2023;:51-51.
https://hdl.handle.net/21.15107/rcub_vinar_12323 .

Božinović, Nevena, Petrović, Suzana, Novaković, Mirjana, Rajić, Vladimir, "Thin film deposition of multilayers on silicon substrate laser pre-patterned" in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts (2023):51-51,
https://hdl.handle.net/21.15107/rcub_vinar_12323 .

TY  - JOUR
AU  - Radetić, Tamara
AU  - Popović, Miljana M.
AU  - Novaković, Mirjana M.
AU  - Rajić, Vladimir
AU  - Romhanji, Endre L.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12726
AB  - The Fe-bearing intermetallic phases present in the as-cast AA6026 alloy and their evolution during homogenization treatments at 480-550°C were investigated using optical microscopy, SEM, and TEM techniques in combination with EDS analysis. In addition to the α-Al(Fe,Mn)Si phase with dendritic morphology, two types of plate-like Fe-bearing microconstituents were revealed in the microstructure of the as-cast alloy. The EDS microanalysis and electron diffraction showed that one set of platelets represented thin sections of α-Al(Fe,Mn)Si microconstituent. The other set of plate-like microconstituents was identified as a tetragonal, silicon-rich δ-Al4(Fe,Mn)Si2 phase. The formation of the δ-Al4(Fe,Mn)Si2 phase was attributed to the chemical composition of the alloy. During homogenization, the metastable δ-Al4(Fe,Mn)Si2 transformed into the α-Al(Fe,Mn)Si phase and fragmented. The dendritic α-Al(Fe,Mn)Si microconstituents underwent fragmentation. However, while the α-Al(Fe,Mn)Si microconstituents preserved a b.c.c. crystal lattice throughout the process, the product of the transformation of the δ-Al4(Fe,Mn)Si2 phase exhibited primitive cubic lattice.
AB  - Ispitivanje prisustva faza koje sadrže Fe u mikrostrukturi livene legure AA6026, kao i njihova evolucija tokom postupaka homogenizacije na temperaturama od 480-550 °C, sprovedena su korišćenjem optičke mikroskopije, skenirajuće elektronske mikroskopije (SEM) i transmisione elektronske mikroskopije (TEM) u kombinaciji sa analizom EDS-a. Osim faze α-Al(Fe,Mn)Si sa dendritskom morfologijom, identifikovane su dve vrste pločastih mikrokonstituenata koji sadrže Fe u mikrostrukturi livene legure. EDS mikroanaliza i elektronska difrakcija pokazali su da jedan skup ploča predstavlja samo tanke sekcije mikrokonstituente α-Al(Fe,Mn)Si. Drugi skup pločastih mikrokonstituenata identifikovan je kao četvrtasta, silicijumom bogata faza δ-Al4 (Fe,Mn)Si2 . Formiranje faze δ-Al4 (Fe,Mn)Si2 povezano je sa hemijskim sastavom legure. Tokom homogenizacije, metastabilna faza δ-Al4 (Fe,Mn)Si2 transformisala se u fazu α-Al(Fe,Mn)Si i fragmentirala. Dendritski mikrokonstituenti α-Al(Fe,Mn)Si takođe su fragmentirali. Međutim, dok su mikrokonstituenti α-Al(Fe,Mn)Si sačuvali kubnu kristalnu rešetku tipa b.c.c. tokom procesa, proizvod transformacije faze δ-Al4 (Fe,Mn)Si2 pokazao je prostu kubnu rešetku.
T2  - Journal of Mining and Metallurgy, Section B: Metallurgy
T1  - Identification of Fe-bearing phases in the as-cast microstructure of AA6026 alloy and their evolution during homogenization treatment
T1  - Prepoznavanje faza koje sadrže Fe u mikrostrukturi livene legure AA6026 i njihova evolucija tokom postupka homogenizacije
VL  - 59
IS  - 2
SP  - 327
EP  - 338
DO  - 10.2298/JMMB230611028R
ER  - 

@article{
author = "Radetić, Tamara and Popović, Miljana M. and Novaković, Mirjana M. and Rajić, Vladimir and Romhanji, Endre L.",
year = "2023",
abstract = "The Fe-bearing intermetallic phases present in the as-cast AA6026 alloy and their evolution during homogenization treatments at 480-550°C were investigated using optical microscopy, SEM, and TEM techniques in combination with EDS analysis. In addition to the α-Al(Fe,Mn)Si phase with dendritic morphology, two types of plate-like Fe-bearing microconstituents were revealed in the microstructure of the as-cast alloy. The EDS microanalysis and electron diffraction showed that one set of platelets represented thin sections of α-Al(Fe,Mn)Si microconstituent. The other set of plate-like microconstituents was identified as a tetragonal, silicon-rich δ-Al4(Fe,Mn)Si2 phase. The formation of the δ-Al4(Fe,Mn)Si2 phase was attributed to the chemical composition of the alloy. During homogenization, the metastable δ-Al4(Fe,Mn)Si2 transformed into the α-Al(Fe,Mn)Si phase and fragmented. The dendritic α-Al(Fe,Mn)Si microconstituents underwent fragmentation. However, while the α-Al(Fe,Mn)Si microconstituents preserved a b.c.c. crystal lattice throughout the process, the product of the transformation of the δ-Al4(Fe,Mn)Si2 phase exhibited primitive cubic lattice., Ispitivanje prisustva faza koje sadrže Fe u mikrostrukturi livene legure AA6026, kao i njihova evolucija tokom postupaka homogenizacije na temperaturama od 480-550 °C, sprovedena su korišćenjem optičke mikroskopije, skenirajuće elektronske mikroskopije (SEM) i transmisione elektronske mikroskopije (TEM) u kombinaciji sa analizom EDS-a. Osim faze α-Al(Fe,Mn)Si sa dendritskom morfologijom, identifikovane su dve vrste pločastih mikrokonstituenata koji sadrže Fe u mikrostrukturi livene legure. EDS mikroanaliza i elektronska difrakcija pokazali su da jedan skup ploča predstavlja samo tanke sekcije mikrokonstituente α-Al(Fe,Mn)Si. Drugi skup pločastih mikrokonstituenata identifikovan je kao četvrtasta, silicijumom bogata faza δ-Al4 (Fe,Mn)Si2 . Formiranje faze δ-Al4 (Fe,Mn)Si2 povezano je sa hemijskim sastavom legure. Tokom homogenizacije, metastabilna faza δ-Al4 (Fe,Mn)Si2 transformisala se u fazu α-Al(Fe,Mn)Si i fragmentirala. Dendritski mikrokonstituenti α-Al(Fe,Mn)Si takođe su fragmentirali. Međutim, dok su mikrokonstituenti α-Al(Fe,Mn)Si sačuvali kubnu kristalnu rešetku tipa b.c.c. tokom procesa, proizvod transformacije faze δ-Al4 (Fe,Mn)Si2 pokazao je prostu kubnu rešetku.",
journal = "Journal of Mining and Metallurgy, Section B: Metallurgy",
title = "Identification of Fe-bearing phases in the as-cast microstructure of AA6026 alloy and their evolution during homogenization treatment, Prepoznavanje faza koje sadrže Fe u mikrostrukturi livene legure AA6026 i njihova evolucija tokom postupka homogenizacije",
volume = "59",
number = "2",
pages = "327-338",
doi = "10.2298/JMMB230611028R"
}

Radetić, T., Popović, M. M., Novaković, M. M., Rajić, V.,& Romhanji, E. L.. (2023). Identification of Fe-bearing phases in the as-cast microstructure of AA6026 alloy and their evolution during homogenization treatment. in Journal of Mining and Metallurgy, Section B: Metallurgy, 59(2), 327-338.
https://doi.org/10.2298/JMMB230611028R

Radetić T, Popović MM, Novaković MM, Rajić V, Romhanji EL. Identification of Fe-bearing phases in the as-cast microstructure of AA6026 alloy and their evolution during homogenization treatment. in Journal of Mining and Metallurgy, Section B: Metallurgy. 2023;59(2):327-338.
doi:10.2298/JMMB230611028R .

Radetić, Tamara, Popović, Miljana M., Novaković, Mirjana M., Rajić, Vladimir, Romhanji, Endre L., "Identification of Fe-bearing phases in the as-cast microstructure of AA6026 alloy and their evolution during homogenization treatment" in Journal of Mining and Metallurgy, Section B: Metallurgy, 59, no. 2 (2023):327-338,
https://doi.org/10.2298/JMMB230611028R . .

TY  - JOUR
AU  - Aleksić, Katarina
AU  - Stojković Simatović, Ivana
AU  - Stanković, Ana
AU  - Veselinović, Ljiljana
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Radmilović, Nadežda
AU  - Rajić, Vladimir
AU  - Škapin, Srečo Davor
AU  - Mančić, Lidija
AU  - Marković, Smilja
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11080
AB  - Catalytic materials are the greatest challenge for the commercial application of water electrolysis (WEs) and fuel cells (FCs) as clean energy technologies. There is a need to find an alternative to expensive and unavailable platinum group metal (PGM) catalysts. This study aimed to reduce the cost of PGM materials by replacing Ru with RuO2 and lowering the amount of RuO2 by adding abundant and multifunctional ZnO. A ZnO@RuO2 composite in a 10:1 molar ratio was synthesized by microwave processing of a precipitate as a green, low-cost, and fast method, and then annealed at 300°C and 600°C to improve the catalytic properties. The physicochemical properties of the ZnO@RuO2 composites were investigated by X-ray powder diffraction (XRD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The electrochemical activity of the samples was investigated by linear sweep voltammetry in acidic and alkaline electrolytes. We observed good bifunctional catalytic activity of the ZnO@RuO2 composites toward HER and OER in both electrolytes. The improved bifunctional catalytic activity of the ZnO@RuO2 composite by annealing was discussed and attributed to the reduced number of bulk oxygen vacancies and the increased number of established heterojunctions.
T2  - Frontiers in Chemistry
T1  - Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting
VL  - 11
DO  - 10.3389/fchem.2023.1173910
ER  - 

@article{
author = "Aleksić, Katarina and Stojković Simatović, Ivana and Stanković, Ana and Veselinović, Ljiljana and Stojadinović, Stevan and Rac, Vladislav and Radmilović, Nadežda and Rajić, Vladimir and Škapin, Srečo Davor and Mančić, Lidija and Marković, Smilja",
year = "2023",
abstract = "Catalytic materials are the greatest challenge for the commercial application of water electrolysis (WEs) and fuel cells (FCs) as clean energy technologies. There is a need to find an alternative to expensive and unavailable platinum group metal (PGM) catalysts. This study aimed to reduce the cost of PGM materials by replacing Ru with RuO2 and lowering the amount of RuO2 by adding abundant and multifunctional ZnO. A ZnO@RuO2 composite in a 10:1 molar ratio was synthesized by microwave processing of a precipitate as a green, low-cost, and fast method, and then annealed at 300°C and 600°C to improve the catalytic properties. The physicochemical properties of the ZnO@RuO2 composites were investigated by X-ray powder diffraction (XRD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The electrochemical activity of the samples was investigated by linear sweep voltammetry in acidic and alkaline electrolytes. We observed good bifunctional catalytic activity of the ZnO@RuO2 composites toward HER and OER in both electrolytes. The improved bifunctional catalytic activity of the ZnO@RuO2 composite by annealing was discussed and attributed to the reduced number of bulk oxygen vacancies and the increased number of established heterojunctions.",
journal = "Frontiers in Chemistry",
title = "Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting",
volume = "11",
doi = "10.3389/fchem.2023.1173910"
}

Aleksić, K., Stojković Simatović, I., Stanković, A., Veselinović, L., Stojadinović, S., Rac, V., Radmilović, N., Rajić, V., Škapin, S. D., Mančić, L.,& Marković, S.. (2023). Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting. in Frontiers in Chemistry, 11.
https://doi.org/10.3389/fchem.2023.1173910

Aleksić K, Stojković Simatović I, Stanković A, Veselinović L, Stojadinović S, Rac V, Radmilović N, Rajić V, Škapin SD, Mančić L, Marković S. Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting. in Frontiers in Chemistry. 2023;11.
doi:10.3389/fchem.2023.1173910 .

Aleksić, Katarina, Stojković Simatović, Ivana, Stanković, Ana, Veselinović, Ljiljana, Stojadinović, Stevan, Rac, Vladislav, Radmilović, Nadežda, Rajić, Vladimir, Škapin, Srečo Davor, Mančić, Lidija, Marković, Smilja, "Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting" in Frontiers in Chemistry, 11 (2023),
https://doi.org/10.3389/fchem.2023.1173910 . .

TY  - CONF
AU  - Rajić, Vladimir
AU  - Marković, Smilja
AU  - Popović, M.
AU  - Novaković, M.
AU  - Veselinović, Ljiljana
AU  - Stojković Simatović, Ivana
AU  - Škapin, Srečo Davor
AU  - Stojanović, S.
AU  - Rac, Vladislav
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11554
AB  - Zink oxide-based materials have a great potential to be applied in photo and electro catalysts, opto-electronic (indoor illumination, LED), etc. Attractiveness of ZnO is attributed to wide bandgap energy at room temperature (3.37 eV), high electron mobility and transfer efficiency (115-155 cm2·V-1·s-1), large exciton binding energy (60 meV), intrinsic stability, nontoxicity, environmental compatibility and also, simple and not expensive synthesis procedure. A lot of different approaches can be used to modify the bandgap (i.e. optical absorption) of ZnO materials: metal and nonmetal ion doping, hydrogenation, the incorporation of crystalline defects in the form of V and I, modification of particles morphology and surface topology, etc. In this study, eco-friendly and rapid microwave processing of a precipitate was used to produce Fe-doped ZnO nanoparticles with 5, 10, 15 and 20 at.% of Fe (Zn1-xFeyO(1-x+1.5y)). The influence of different amount of Fe substituted Zn in ZnO on the crystal structure, morphological, textural, and optical properties as well as on functionality of ZnO particles was investigated. The crystal structure and phase purity of the Zn1-xFeyO(1-x+1.5y) particles were determined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). Effects of the Fe3+ amount on particles morphology and texture properties were observed with field emission scanning electron microscopy (FE–SEM), transmission electron microscopy (TEM) and nitrogen adsorption–desorption isotherm, respectively. Optical properties were studied using UV-Vis diffuse reflectance and photoluminescence spectroscopy. Functionality of ZnO particles was studied due to their photocatalytic and electrochemical activities. Photocatalytic activity was examined via decolorization of methylene blue under direct sunlight irradiation. Electrochemical behavior of the ZnO samples as anode material was evaluated by linear sweep voltammetry in 0.5 M Na2SO4 electrolyte.
PB  - Belgrade : Vinča Institute of Nuclear Sciences
C3  - PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
T1  - Crystal structure, optical properties and photo/electrocatalytic activity of nanostructured Zn1-xFeyO(1-x+1.5y)
SP  - 34
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11554
ER  - 

@conference{
author = "Rajić, Vladimir and Marković, Smilja and Popović, M. and Novaković, M. and Veselinović, Ljiljana and Stojković Simatović, Ivana and Škapin, Srečo Davor and Stojanović, S. and Rac, Vladislav",
year = "2023",
abstract = "Zink oxide-based materials have a great potential to be applied in photo and electro catalysts, opto-electronic (indoor illumination, LED), etc. Attractiveness of ZnO is attributed to wide bandgap energy at room temperature (3.37 eV), high electron mobility and transfer efficiency (115-155 cm2·V-1·s-1), large exciton binding energy (60 meV), intrinsic stability, nontoxicity, environmental compatibility and also, simple and not expensive synthesis procedure. A lot of different approaches can be used to modify the bandgap (i.e. optical absorption) of ZnO materials: metal and nonmetal ion doping, hydrogenation, the incorporation of crystalline defects in the form of V and I, modification of particles morphology and surface topology, etc. In this study, eco-friendly and rapid microwave processing of a precipitate was used to produce Fe-doped ZnO nanoparticles with 5, 10, 15 and 20 at.% of Fe (Zn1-xFeyO(1-x+1.5y)). The influence of different amount of Fe substituted Zn in ZnO on the crystal structure, morphological, textural, and optical properties as well as on functionality of ZnO particles was investigated. The crystal structure and phase purity of the Zn1-xFeyO(1-x+1.5y) particles were determined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). Effects of the Fe3+ amount on particles morphology and texture properties were observed with field emission scanning electron microscopy (FE–SEM), transmission electron microscopy (TEM) and nitrogen adsorption–desorption isotherm, respectively. Optical properties were studied using UV-Vis diffuse reflectance and photoluminescence spectroscopy. Functionality of ZnO particles was studied due to their photocatalytic and electrochemical activities. Photocatalytic activity was examined via decolorization of methylene blue under direct sunlight irradiation. Electrochemical behavior of the ZnO samples as anode material was evaluated by linear sweep voltammetry in 0.5 M Na2SO4 electrolyte.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade",
title = "Crystal structure, optical properties and photo/electrocatalytic activity of nanostructured Zn1-xFeyO(1-x+1.5y)",
pages = "34",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11554"
}

Rajić, V., Marković, S., Popović, M., Novaković, M., Veselinović, L., Stojković Simatović, I., Škapin, S. D., Stojanović, S.,& Rac, V.. (2023). Crystal structure, optical properties and photo/electrocatalytic activity of nanostructured Zn1-xFeyO(1-x+1.5y). in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
Belgrade : Vinča Institute of Nuclear Sciences., 34.
https://hdl.handle.net/21.15107/rcub_vinar_11554

Rajić V, Marković S, Popović M, Novaković M, Veselinović L, Stojković Simatović I, Škapin SD, Stojanović S, Rac V. Crystal structure, optical properties and photo/electrocatalytic activity of nanostructured Zn1-xFeyO(1-x+1.5y). in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade. 2023;:34.
https://hdl.handle.net/21.15107/rcub_vinar_11554 .

Rajić, Vladimir, Marković, Smilja, Popović, M., Novaković, M., Veselinović, Ljiljana, Stojković Simatović, Ivana, Škapin, Srečo Davor, Stojanović, S., Rac, Vladislav, "Crystal structure, optical properties and photo/electrocatalytic activity of nanostructured Zn1-xFeyO(1-x+1.5y)" in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade (2023):34,
https://hdl.handle.net/21.15107/rcub_vinar_11554 .

TY  - CONF
AU  - Rmuš Mravik, Jelena
AU  - Rajić, Vladimir
AU  - Belec, Blaž
AU  - Mravik, Željko
AU  - Jovanović, Zoran
AU  - Stojković Simatović, Ivana
AU  - Kurko, Sandra
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11657
AB  - Hydrogen production can be outlined as an important aspect of the modern economy. In order to be more clean and renewable, green hydrogen is most desirable, where expensive catalysts for water electrolysis are usually used. As alternative, transition metal dichalcogenides represent potentially good material, with room for further improvement. Molybdenum disulfide is a stable material with a reasonable amount of it available. The properties of the material can be easily tuned in order to increase its charge transport and create more active sites. The incorporation of defects and additives can be beneficial for the catalytic activity of MoS2. Graphene oxide (GO) is carbon nanomaterial, with a large surface area and when reduced, it could be used as a conductive additive. Furthermore, ball milling is a known low-cost, simple and scalable method to introduce defects in the structure. Therefore, combining these two approaches should result in a material with enhanced catalytic activity for hydrogen evolution reaction. The molybdenum disulfide was prepared by easy one-step hydrothermal synthesis. The graphene oxide was first obtained by modified Hummers’ method and after that reduced by thermal treatment at 200 °C. Thus prepared constituents are combined in different mass ratios and composites were obtained by milling with a high-energy ball mill. The various milling parameters were optimized. The prepared composites were analyzed as catalysts for hydrogen evolution reaction in an acidic solution.
PB  - Belgrade : Materials Research Society of Serbia
C3  - YUCOMAT 2023 : 24th Annual Conference YUCOMAT 2023 : programme and the book of abstracts; September 4-8, 2023; Herceg Novi, Montenegro
T1  - Modification of MoS2/GO composites with ball milling and thermal treatment for catalytic application
SP  - 156
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11657
ER  - 

@conference{
author = "Rmuš Mravik, Jelena and Rajić, Vladimir and Belec, Blaž and Mravik, Željko and Jovanović, Zoran and Stojković Simatović, Ivana and Kurko, Sandra",
year = "2023",
abstract = "Hydrogen production can be outlined as an important aspect of the modern economy. In order to be more clean and renewable, green hydrogen is most desirable, where expensive catalysts for water electrolysis are usually used. As alternative, transition metal dichalcogenides represent potentially good material, with room for further improvement. Molybdenum disulfide is a stable material with a reasonable amount of it available. The properties of the material can be easily tuned in order to increase its charge transport and create more active sites. The incorporation of defects and additives can be beneficial for the catalytic activity of MoS2. Graphene oxide (GO) is carbon nanomaterial, with a large surface area and when reduced, it could be used as a conductive additive. Furthermore, ball milling is a known low-cost, simple and scalable method to introduce defects in the structure. Therefore, combining these two approaches should result in a material with enhanced catalytic activity for hydrogen evolution reaction. The molybdenum disulfide was prepared by easy one-step hydrothermal synthesis. The graphene oxide was first obtained by modified Hummers’ method and after that reduced by thermal treatment at 200 °C. Thus prepared constituents are combined in different mass ratios and composites were obtained by milling with a high-energy ball mill. The various milling parameters were optimized. The prepared composites were analyzed as catalysts for hydrogen evolution reaction in an acidic solution.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "YUCOMAT 2023 : 24th Annual Conference YUCOMAT 2023 : programme and the book of abstracts; September 4-8, 2023; Herceg Novi, Montenegro",
title = "Modification of MoS2/GO composites with ball milling and thermal treatment for catalytic application",
pages = "156",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11657"
}

Rmuš Mravik, J., Rajić, V., Belec, B., Mravik, Ž., Jovanović, Z., Stojković Simatović, I.,& Kurko, S.. (2023). Modification of MoS2/GO composites with ball milling and thermal treatment for catalytic application. in YUCOMAT 2023 : 24th Annual Conference YUCOMAT 2023 : programme and the book of abstracts; September 4-8, 2023; Herceg Novi, Montenegro
Belgrade : Materials Research Society of Serbia., 156.
https://hdl.handle.net/21.15107/rcub_vinar_11657

Rmuš Mravik J, Rajić V, Belec B, Mravik Ž, Jovanović Z, Stojković Simatović I, Kurko S. Modification of MoS2/GO composites with ball milling and thermal treatment for catalytic application. in YUCOMAT 2023 : 24th Annual Conference YUCOMAT 2023 : programme and the book of abstracts; September 4-8, 2023; Herceg Novi, Montenegro. 2023;:156.
https://hdl.handle.net/21.15107/rcub_vinar_11657 .

Rmuš Mravik, Jelena, Rajić, Vladimir, Belec, Blaž, Mravik, Željko, Jovanović, Zoran, Stojković Simatović, Ivana, Kurko, Sandra, "Modification of MoS2/GO composites with ball milling and thermal treatment for catalytic application" in YUCOMAT 2023 : 24th Annual Conference YUCOMAT 2023 : programme and the book of abstracts; September 4-8, 2023; Herceg Novi, Montenegro (2023):156,
https://hdl.handle.net/21.15107/rcub_vinar_11657 .

TY  - JOUR
AU  - Stamenković, Tijana
AU  - Pjević, Dejan J.
AU  - Krstić, Jugoslav
AU  - Popović, Maja
AU  - Rajić, Vladimir
AU  - Lojpur, Vesna
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10684
AB  - A set of samples of SrGd2O4 doped with Sm3+ and Dy3+with different concentrations was prepared via glycine-assisted combustion synthesis. All of the diffraction peaks are related to the pure orthorhombic lattice SrGd2O4, according to X-ray Powder Diffraction investigation. The Energy Dispersive X-ray Spectroscopy chemical characterization revealed that the structure included all desired elements. Field Emission Scanning Electron Microscopy was used to capture the morphology, which showed porous aggregated particles consisting of roughly 50 nm-sized spherical particles. The Mercury Intrusion Porosimetry was used to establish where voids originated, and the results showed that samples have a real permanent 3D pore structure. X-ray Photoelectron Spectroscopy verified the successful incorporation of Dy3+ and Sm3+ ions in the matrix. Down-conversion luminescence spectra were recorded and typical emission transitions were found for either Sm3+ (4G5/2→6H5/2, 4G5/2→6H7/2, 4G5/2→6H9/2) or Dy3+ (4F9/2→6H15/2 and 4F9/2→6H13/2) ions. Calculation of the energy band gap using UV-VIS Diffuse Reflectance Spectroscopy yielded values of 4.3 eV for both doped samples. Using UV-VIS Absorption Spectroscopy, the photocatalytic degradation process was observed. After 4 h of simulating Sun exposure, an analysis of the photocatalytic properties revealed that approximately 50% of the Rhodamine B had been mineralized.
T2  - Surfaces and Interfaces
T1  - Characterization and photocatalytic application of SrGd2O4 doped with rare earth Sm3+ and Dy3+ ions
VL  - 37
SP  - 102755
DO  - 10.1016/j.surfin.2023.102755
ER  - 

@article{
author = "Stamenković, Tijana and Pjević, Dejan J. and Krstić, Jugoslav and Popović, Maja and Rajić, Vladimir and Lojpur, Vesna",
year = "2023",
abstract = "A set of samples of SrGd2O4 doped with Sm3+ and Dy3+with different concentrations was prepared via glycine-assisted combustion synthesis. All of the diffraction peaks are related to the pure orthorhombic lattice SrGd2O4, according to X-ray Powder Diffraction investigation. The Energy Dispersive X-ray Spectroscopy chemical characterization revealed that the structure included all desired elements. Field Emission Scanning Electron Microscopy was used to capture the morphology, which showed porous aggregated particles consisting of roughly 50 nm-sized spherical particles. The Mercury Intrusion Porosimetry was used to establish where voids originated, and the results showed that samples have a real permanent 3D pore structure. X-ray Photoelectron Spectroscopy verified the successful incorporation of Dy3+ and Sm3+ ions in the matrix. Down-conversion luminescence spectra were recorded and typical emission transitions were found for either Sm3+ (4G5/2→6H5/2, 4G5/2→6H7/2, 4G5/2→6H9/2) or Dy3+ (4F9/2→6H15/2 and 4F9/2→6H13/2) ions. Calculation of the energy band gap using UV-VIS Diffuse Reflectance Spectroscopy yielded values of 4.3 eV for both doped samples. Using UV-VIS Absorption Spectroscopy, the photocatalytic degradation process was observed. After 4 h of simulating Sun exposure, an analysis of the photocatalytic properties revealed that approximately 50% of the Rhodamine B had been mineralized.",
journal = "Surfaces and Interfaces",
title = "Characterization and photocatalytic application of SrGd2O4 doped with rare earth Sm3+ and Dy3+ ions",
volume = "37",
pages = "102755",
doi = "10.1016/j.surfin.2023.102755"
}

Stamenković, T., Pjević, D. J., Krstić, J., Popović, M., Rajić, V.,& Lojpur, V.. (2023). Characterization and photocatalytic application of SrGd2O4 doped with rare earth Sm3+ and Dy3+ ions. in Surfaces and Interfaces, 37, 102755.
https://doi.org/10.1016/j.surfin.2023.102755

Stamenković T, Pjević DJ, Krstić J, Popović M, Rajić V, Lojpur V. Characterization and photocatalytic application of SrGd2O4 doped with rare earth Sm3+ and Dy3+ ions. in Surfaces and Interfaces. 2023;37:102755.
doi:10.1016/j.surfin.2023.102755 .

Stamenković, Tijana, Pjević, Dejan J., Krstić, Jugoslav, Popović, Maja, Rajić, Vladimir, Lojpur, Vesna, "Characterization and photocatalytic application of SrGd2O4 doped with rare earth Sm3+ and Dy3+ ions" in Surfaces and Interfaces, 37 (2023):102755,
https://doi.org/10.1016/j.surfin.2023.102755 . .

TY  - JOUR
AU  - Božinović, Nevena
AU  - Savva, Kyriaki
AU  - Rajić, Vladimir
AU  - Popović, Maja
AU  - Tošić, Dragana
AU  - Janjetović, Kristina
AU  - Despotović, Ana
AU  - Zogović, Nevena
AU  - Stratakis, Emmanuel
AU  - Petrović, Suzana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11547
AB  - The creation of novel biocompatible Ti-based thin films with a Zr or Cu sub-layer modified by ultrafast laser processing is studied. To prepare bioactive surfaces, ultrafast laser processing is focused on the formation of laser-induced periodic surface structures (LIPSS) with the production of oxide phases at the surfaces. Two differently designed multilayer thin films Ti/Cu/Ti and Ti/Zr/Ti were deposited on the silicon using the ion sputtering method. The Ti thin film contains Cu or Zr sub-layer (thickness of 10 nm) at the 10 nm below the surface. The composition and surface morphology variations for these systems, deposited and laser-processed under the same experimental conditions, were caused only by different thermo-physical properties of the sub-layer (Cu or Zr). The surface morphology in the form of LIPSS, led to improved cell adhesion and stable cells/thin films interface compared to as-deposited samples. Field-emission scanning electron microscopy and MTT analysis revealed that laser processing of both systems increased cell adhesion, proliferation, and metabolical activity of L929 mouse fibroblast cells compared to non-modified flat surfaces. Overall, the biocompatibility of Zrcontaining thin films is better than Ti/Cu/Ti system. Further, laser processing and formation of LIPSS makes Ti/Zr/Ti thin films excellent candidate for biomedical
T2  - Materials Chemistry and Physics
T1  - Influence of zirconium and copper sub-layer in cell integrations on femtosecond laser-processed Ti thin films
VL  - 308
SP  - 128286
DO  - 10.1016/j.matchemphys.2023.128286
ER  - 

@article{
author = "Božinović, Nevena and Savva, Kyriaki and Rajić, Vladimir and Popović, Maja and Tošić, Dragana and Janjetović, Kristina and Despotović, Ana and Zogović, Nevena and Stratakis, Emmanuel and Petrović, Suzana",
year = "2023",
abstract = "The creation of novel biocompatible Ti-based thin films with a Zr or Cu sub-layer modified by ultrafast laser processing is studied. To prepare bioactive surfaces, ultrafast laser processing is focused on the formation of laser-induced periodic surface structures (LIPSS) with the production of oxide phases at the surfaces. Two differently designed multilayer thin films Ti/Cu/Ti and Ti/Zr/Ti were deposited on the silicon using the ion sputtering method. The Ti thin film contains Cu or Zr sub-layer (thickness of 10 nm) at the 10 nm below the surface. The composition and surface morphology variations for these systems, deposited and laser-processed under the same experimental conditions, were caused only by different thermo-physical properties of the sub-layer (Cu or Zr). The surface morphology in the form of LIPSS, led to improved cell adhesion and stable cells/thin films interface compared to as-deposited samples. Field-emission scanning electron microscopy and MTT analysis revealed that laser processing of both systems increased cell adhesion, proliferation, and metabolical activity of L929 mouse fibroblast cells compared to non-modified flat surfaces. Overall, the biocompatibility of Zrcontaining thin films is better than Ti/Cu/Ti system. Further, laser processing and formation of LIPSS makes Ti/Zr/Ti thin films excellent candidate for biomedical",
journal = "Materials Chemistry and Physics",
title = "Influence of zirconium and copper sub-layer in cell integrations on femtosecond laser-processed Ti thin films",
volume = "308",
pages = "128286",
doi = "10.1016/j.matchemphys.2023.128286"
}

Božinović, N., Savva, K., Rajić, V., Popović, M., Tošić, D., Janjetović, K., Despotović, A., Zogović, N., Stratakis, E.,& Petrović, S.. (2023). Influence of zirconium and copper sub-layer in cell integrations on femtosecond laser-processed Ti thin films. in Materials Chemistry and Physics, 308, 128286.
https://doi.org/10.1016/j.matchemphys.2023.128286

Božinović N, Savva K, Rajić V, Popović M, Tošić D, Janjetović K, Despotović A, Zogović N, Stratakis E, Petrović S. Influence of zirconium and copper sub-layer in cell integrations on femtosecond laser-processed Ti thin films. in Materials Chemistry and Physics. 2023;308:128286.
doi:10.1016/j.matchemphys.2023.128286 .

Božinović, Nevena, Savva, Kyriaki, Rajić, Vladimir, Popović, Maja, Tošić, Dragana, Janjetović, Kristina, Despotović, Ana, Zogović, Nevena, Stratakis, Emmanuel, Petrović, Suzana, "Influence of zirconium and copper sub-layer in cell integrations on femtosecond laser-processed Ti thin films" in Materials Chemistry and Physics, 308 (2023):128286,
https://doi.org/10.1016/j.matchemphys.2023.128286 . .

TY  - CONF
AU  - Rakočević, Lazar
AU  - Golubović, Jelena
AU  - Rajić, Vladimir
AU  - Štrbac, Svetlana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12330
AB  - Finding suitable catalysts for hydrogen evolution reaction (HER) is key for economic production of hydrogen for use in fuel cells. Reducing the amount of expensive noble metals that are used is one of the ways for obtaining such catalysts. Various combinations of different noble metals and various carbon supports have been studied. In this work nanoplatelets (GNP) was used as a support and on it Pt nanoparticles were electrochemically deposited in sub monolayer nanoislands. Obtained Pt/GNP electrode was characterized by X ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) while its electrocatalytic activity was investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperometry . XPS analysis showed that the atomic percentages of Pt in Pt/GNP was 1.3% for electhrochemical deposition and 0.3% for spontaneous deposition, respectively. SEM micrographs of Pt/GNP electrode surface showed that Pt nanoparticles occupy mostly the edges GNP support, while elemental maping confirms the distribution of Pt, C and O over the surface of the electrode. Pt/GNP electrode has shown remarkably good performance for HER reaction in 0.5 M H2SO4 acid solution. Outstanding HER activity was achieved, showing the initial potential close to the equilibrium potential for HER and of -0.003 V and a low Tafel slope of about -30 mV/dec. The chronoamperometric measurement performed over 180 min for hydrogen evolution at the constant potential indicates good stability and durability.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
T1  - Characterization and hydrogen evolution on Pt/nanoplatelets
SP  - 82
EP  - 82
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12330
ER  - 

@conference{
author = "Rakočević, Lazar and Golubović, Jelena and Rajić, Vladimir and Štrbac, Svetlana",
year = "2023",
abstract = "Finding suitable catalysts for hydrogen evolution reaction (HER) is key for economic production of hydrogen for use in fuel cells. Reducing the amount of expensive noble metals that are used is one of the ways for obtaining such catalysts. Various combinations of different noble metals and various carbon supports have been studied. In this work nanoplatelets (GNP) was used as a support and on it Pt nanoparticles were electrochemically deposited in sub monolayer nanoislands. Obtained Pt/GNP electrode was characterized by X ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) while its electrocatalytic activity was investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperometry . XPS analysis showed that the atomic percentages of Pt in Pt/GNP was 1.3% for electhrochemical deposition and 0.3% for spontaneous deposition, respectively. SEM micrographs of Pt/GNP electrode surface showed that Pt nanoparticles occupy mostly the edges GNP support, while elemental maping confirms the distribution of Pt, C and O over the surface of the electrode. Pt/GNP electrode has shown remarkably good performance for HER reaction in 0.5 M H2SO4 acid solution. Outstanding HER activity was achieved, showing the initial potential close to the equilibrium potential for HER and of -0.003 V and a low Tafel slope of about -30 mV/dec. The chronoamperometric measurement performed over 180 min for hydrogen evolution at the constant potential indicates good stability and durability.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts",
title = "Characterization and hydrogen evolution on Pt/nanoplatelets",
pages = "82-82",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12330"
}

Rakočević, L., Golubović, J., Rajić, V.,& Štrbac, S.. (2023). Characterization and hydrogen evolution on Pt/nanoplatelets. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
Belgrade : Institute of Technical Sciences of SASA., 82-82.
https://hdl.handle.net/21.15107/rcub_vinar_12330

Rakočević L, Golubović J, Rajić V, Štrbac S. Characterization and hydrogen evolution on Pt/nanoplatelets. in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts. 2023;:82-82.
https://hdl.handle.net/21.15107/rcub_vinar_12330 .

Rakočević, Lazar, Golubović, Jelena, Rajić, Vladimir, Štrbac, Svetlana, "Characterization and hydrogen evolution on Pt/nanoplatelets" in 21st Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts (2023):82-82,
https://hdl.handle.net/21.15107/rcub_vinar_12330 .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Božinović, Nevena
AU  - Rajić, Vladimir
AU  - Stanisavljević Ninković, Danijela
AU  - Kisić, Danilo
AU  - Stevanović, Milena J.
AU  - Stratakis, Emmanuel
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11368
AB  - Arranged patterns obtained via ultrafast laser processing on the surface of Ti/Cu/Ti/Si and Ti/Zr/Ti/Si thin-film systems are reported. Two differently designed multilayer thin films Ti/Cu/Ti/Si and Ti/Zr/Ti/Si were deposited on silicon using the ion sputtering method. The bioactive surfaces of these systems involve the formation of laser-induced periodic surface structures (LIPSS) in each of the laser-written lines of mesh patterns on 5 × 5 mm areas. The formation of nano- and micro-patterns with an ultra-thin oxide film on the surfaces was used to observe the effects of morphology and proliferation of the MRC-5 cell culture line. To determine whether Ti-based thin films have a toxic effect on living cells, an MTT assay was performed. The relative cytotoxic effect, as a percentage of surviving cells, showed that there was no difference in cell number between the Ti-based thin films and the control cells. There was also no difference in the viability of the MRC-5 cells, except for the Ti/Cu/Ti/Si system, where there was a slight 10% decrease in cell viability. © 2023 by the authors.
T2  - Coatings
T1  - Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems
VL  - 13
IS  - 6
SP  - 1107
DO  - 10.3390/coatings13061107
ER  - 

@article{
author = "Petrović, Suzana and Božinović, Nevena and Rajić, Vladimir and Stanisavljević Ninković, Danijela and Kisić, Danilo and Stevanović, Milena J. and Stratakis, Emmanuel",
year = "2023",
abstract = "Arranged patterns obtained via ultrafast laser processing on the surface of Ti/Cu/Ti/Si and Ti/Zr/Ti/Si thin-film systems are reported. Two differently designed multilayer thin films Ti/Cu/Ti/Si and Ti/Zr/Ti/Si were deposited on silicon using the ion sputtering method. The bioactive surfaces of these systems involve the formation of laser-induced periodic surface structures (LIPSS) in each of the laser-written lines of mesh patterns on 5 × 5 mm areas. The formation of nano- and micro-patterns with an ultra-thin oxide film on the surfaces was used to observe the effects of morphology and proliferation of the MRC-5 cell culture line. To determine whether Ti-based thin films have a toxic effect on living cells, an MTT assay was performed. The relative cytotoxic effect, as a percentage of surviving cells, showed that there was no difference in cell number between the Ti-based thin films and the control cells. There was also no difference in the viability of the MRC-5 cells, except for the Ti/Cu/Ti/Si system, where there was a slight 10% decrease in cell viability. © 2023 by the authors.",
journal = "Coatings",
title = "Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems",
volume = "13",
number = "6",
pages = "1107",
doi = "10.3390/coatings13061107"
}

Petrović, S., Božinović, N., Rajić, V., Stanisavljević Ninković, D., Kisić, D., Stevanović, M. J.,& Stratakis, E.. (2023). Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems. in Coatings, 13(6), 1107.
https://doi.org/10.3390/coatings13061107

Petrović S, Božinović N, Rajić V, Stanisavljević Ninković D, Kisić D, Stevanović MJ, Stratakis E. Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems. in Coatings. 2023;13(6):1107.
doi:10.3390/coatings13061107 .

Petrović, Suzana, Božinović, Nevena, Rajić, Vladimir, Stanisavljević Ninković, Danijela, Kisić, Danilo, Stevanović, Milena J., Stratakis, Emmanuel, "Cell Response on Laser-Patterned Ti/Zr/Ti and Ti/Cu/Ti Multilayer Systems" in Coatings, 13, no. 6 (2023):1107,
https://doi.org/10.3390/coatings13061107 . .

TY  - CONF
AU  - Božinović, Nevena
AU  - Rajić, Vladimir
AU  - Savva, K.
AU  - Potočnik, Jelena
AU  - Stratakis, E.
AU  - Petrović, S.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11816
AB  - The experimental study of the dynamic femtosecond laser substrate pre-patterning of the Ti/Zr/Ti thin film system is reported. The design of surface pattering with the micrometer features in the form of spikes is investigated in order to improve the arrayed surface structures for biomedical applications. Femtosecond laser pulses were used to acquire black silicon surfaces decorated with conical structures (spikes) on crystalline silicon surfaces under 6.5×102 mbar of SF6 environmental atmosphere. After irradiation, the silicon surface exhibits high aspect ratio spikes, which have conical shapes of about 2 μm height, 40° angle opening, 13×106 cm−2 density that remains approximately uniform across the processed area. Results show that the base of the induced conical structures has an elliptical shape with a major (long) and minor (short) axis on the horizontal plane. It is revealed that the orientation of the long axis of the ellipsis is polarization-dependent with the long axis oriented always perpendicularly to the electric field of the laser beam. Spike formation has been attributed to a complex mechanism initiated by partial material melting and subsequent capillary wave formation driven by surface tension gradients within the molten region. Ion sputtering was used to create unique composite thin films on pre-patterned Si substrates that consist of two layers of Ti and subsurface layer of Zr on the interface of titanium. The total thickness of the deposited composite in Ti/Zr/Ti form was 300 nm. The composition, surface morphology and wetting properties were analyzed by scanning electron microscopy (SEM-EDS), profilometry and wettability measurements. The formation of micro-patterns with spikes array of composite Ti/Zr/Ti thin film systems was used to observe the effects of morphology on survival, adhesion and proliferation of the MRC-5 cell culture line. To determine whether Ti/Zr/Ti thin films have a toxic effect on living cells, an MTT assay was performed. The relative cytotoxic effect as a percentage of surviving cells showed that there was no difference in cell number between the Ti/Zr/Ti thin films and the control cells. There was also no difference in the viability of the MRC-5 cells.
PB  - Belgrade : Vinča Institute of Nuclear Sciences
C3  - PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
T1  - Preparing the bioactive surface of Ti/Zr/Ti system by femtosecond laser pre-patterning of substrate
SP  - 117
EP  - 117
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11816
ER  - 

@conference{
author = "Božinović, Nevena and Rajić, Vladimir and Savva, K. and Potočnik, Jelena and Stratakis, E. and Petrović, S.",
year = "2023",
abstract = "The experimental study of the dynamic femtosecond laser substrate pre-patterning of the Ti/Zr/Ti thin film system is reported. The design of surface pattering with the micrometer features in the form of spikes is investigated in order to improve the arrayed surface structures for biomedical applications. Femtosecond laser pulses were used to acquire black silicon surfaces decorated with conical structures (spikes) on crystalline silicon surfaces under 6.5×102 mbar of SF6 environmental atmosphere. After irradiation, the silicon surface exhibits high aspect ratio spikes, which have conical shapes of about 2 μm height, 40° angle opening, 13×106 cm−2 density that remains approximately uniform across the processed area. Results show that the base of the induced conical structures has an elliptical shape with a major (long) and minor (short) axis on the horizontal plane. It is revealed that the orientation of the long axis of the ellipsis is polarization-dependent with the long axis oriented always perpendicularly to the electric field of the laser beam. Spike formation has been attributed to a complex mechanism initiated by partial material melting and subsequent capillary wave formation driven by surface tension gradients within the molten region. Ion sputtering was used to create unique composite thin films on pre-patterned Si substrates that consist of two layers of Ti and subsurface layer of Zr on the interface of titanium. The total thickness of the deposited composite in Ti/Zr/Ti form was 300 nm. The composition, surface morphology and wetting properties were analyzed by scanning electron microscopy (SEM-EDS), profilometry and wettability measurements. The formation of micro-patterns with spikes array of composite Ti/Zr/Ti thin film systems was used to observe the effects of morphology on survival, adhesion and proliferation of the MRC-5 cell culture line. To determine whether Ti/Zr/Ti thin films have a toxic effect on living cells, an MTT assay was performed. The relative cytotoxic effect as a percentage of surviving cells showed that there was no difference in cell number between the Ti/Zr/Ti thin films and the control cells. There was also no difference in the viability of the MRC-5 cells.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade",
title = "Preparing the bioactive surface of Ti/Zr/Ti system by femtosecond laser pre-patterning of substrate",
pages = "117-117",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11816"
}

Božinović, N., Rajić, V., Savva, K., Potočnik, J., Stratakis, E.,& Petrović, S.. (2023). Preparing the bioactive surface of Ti/Zr/Ti system by femtosecond laser pre-patterning of substrate. in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade
Belgrade : Vinča Institute of Nuclear Sciences., 117-117.
https://hdl.handle.net/21.15107/rcub_vinar_11816

Božinović N, Rajić V, Savva K, Potočnik J, Stratakis E, Petrović S. Preparing the bioactive surface of Ti/Zr/Ti system by femtosecond laser pre-patterning of substrate. in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade. 2023;:117-117.
https://hdl.handle.net/21.15107/rcub_vinar_11816 .

Božinović, Nevena, Rajić, Vladimir, Savva, K., Potočnik, Jelena, Stratakis, E., Petrović, S., "Preparing the bioactive surface of Ti/Zr/Ti system by femtosecond laser pre-patterning of substrate" in PHOTONICA2023 : 9th International School and Conference on Photonics : book of abstracts; August 28 - September 1, 2023; Belgrade (2023):117-117,
https://hdl.handle.net/21.15107/rcub_vinar_11816 .

TY  - JOUR
AU  - Prekodravac, Jovana
AU  - Budimir, Milica
AU  - Kleut, Duška
AU  - Vasiljević, Bojana R.
AU  - Rajić, Vladimir
AU  - Ciasca, Gabriele
AU  - Todorović-Marković, Biljana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10441
AB  - The carbon quantum dots (CQDs) as zero-dimensional carbon nanomaterials with extraordinary physicochemical properties have a broad range of applications. Some of the most intriguing is the CQD thin films for electronic devices and membrane nanofiltration. Here we present the simple and affordable microwave-assisted synthesis method for the production of the nitrogen-doped CQDs (N-CQD) and iron/nitrogen co-doped CQDs (FeN-CQD). The comprehensive study of the morphology and electrical properties of N-CQD and FeN-CQD was discussed after manufacturing obtained nanomaterials in the form of a thin film on different substrates using different deposition procedures. The morphological features of generated thin films altered dramatically when the substrate and nanomaterial properties, as well as the number of deposited layers of CQDs and the chosen deposition process, were taken into consideration.
T2  - Diamond and Related Materials
T1  - Surface functionality as a key parameter for the conductivity of microwave synthesized CQDs thin films
VL  - 129
SP  - 109366
DO  - 10.1016/j.diamond.2022.109366
ER  - 

@article{
author = "Prekodravac, Jovana and Budimir, Milica and Kleut, Duška and Vasiljević, Bojana R. and Rajić, Vladimir and Ciasca, Gabriele and Todorović-Marković, Biljana",
year = "2022",
abstract = "The carbon quantum dots (CQDs) as zero-dimensional carbon nanomaterials with extraordinary physicochemical properties have a broad range of applications. Some of the most intriguing is the CQD thin films for electronic devices and membrane nanofiltration. Here we present the simple and affordable microwave-assisted synthesis method for the production of the nitrogen-doped CQDs (N-CQD) and iron/nitrogen co-doped CQDs (FeN-CQD). The comprehensive study of the morphology and electrical properties of N-CQD and FeN-CQD was discussed after manufacturing obtained nanomaterials in the form of a thin film on different substrates using different deposition procedures. The morphological features of generated thin films altered dramatically when the substrate and nanomaterial properties, as well as the number of deposited layers of CQDs and the chosen deposition process, were taken into consideration.",
journal = "Diamond and Related Materials",
title = "Surface functionality as a key parameter for the conductivity of microwave synthesized CQDs thin films",
volume = "129",
pages = "109366",
doi = "10.1016/j.diamond.2022.109366"
}

Prekodravac, J., Budimir, M., Kleut, D., Vasiljević, B. R., Rajić, V., Ciasca, G.,& Todorović-Marković, B.. (2022). Surface functionality as a key parameter for the conductivity of microwave synthesized CQDs thin films. in Diamond and Related Materials, 129, 109366.
https://doi.org/10.1016/j.diamond.2022.109366

Prekodravac J, Budimir M, Kleut D, Vasiljević BR, Rajić V, Ciasca G, Todorović-Marković B. Surface functionality as a key parameter for the conductivity of microwave synthesized CQDs thin films. in Diamond and Related Materials. 2022;129:109366.
doi:10.1016/j.diamond.2022.109366 .

Prekodravac, Jovana, Budimir, Milica, Kleut, Duška, Vasiljević, Bojana R., Rajić, Vladimir, Ciasca, Gabriele, Todorović-Marković, Biljana, "Surface functionality as a key parameter for the conductivity of microwave synthesized CQDs thin films" in Diamond and Related Materials, 129 (2022):109366,
https://doi.org/10.1016/j.diamond.2022.109366 . .

TY  - JOUR
AU  - Božinović, Nevena
AU  - Rajić, Vladimir
AU  - Kisić, Danilo
AU  - Milovanović, Dubravka S.
AU  - Savović, Jelena
AU  - Petrović, Suzana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10371
AB  - In this study, the design of surface pattering with the co-existence of micrometer and nanometer features was carried out to improve the arrayed surface structures on Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayer thin films by picosecond laser processing. The novel composite structure consisted of two layers of Ti and subsurface distributed Cu and Zr layers (thickness of 10 nm) were deposited by ion sputtering on Si substrate to the total thickness of 300 nm. The changes in the composition, surface morphology, and wetting properties after laser modification was monitored by Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM–EDS), optical profilometry, and wettability measurements. It was found that laser irradiation can induce the melting of material with the formation of wrinkled periodic structures at the edges of the laser spots in both systems as a consequence of the hydrodynamic effects. Another interesting result was that the periodic structure in form of LSFL (low spatial frequency LIPSS) ripples was numerous but slightly pronounced in Ti/Cu/Zr/Ti, due to the presence of the Zr component as an ultra-thin subsurface layer, which most likely favored creating LIPSS. Such laser texturing has been used in the biomedical field as a method of developing surface topography, coated with oxides to potentially improve cell response via suitable surface wetting for a biological system.
T2  - Optical and Quantum Electronics
T1  - Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films
VL  - 54
IS  - 9
SP  - 561
DO  - 10.1007/s11082-022-03910-6
ER  - 

@article{
author = "Božinović, Nevena and Rajić, Vladimir and Kisić, Danilo and Milovanović, Dubravka S. and Savović, Jelena and Petrović, Suzana",
year = "2022",
abstract = "In this study, the design of surface pattering with the co-existence of micrometer and nanometer features was carried out to improve the arrayed surface structures on Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayer thin films by picosecond laser processing. The novel composite structure consisted of two layers of Ti and subsurface distributed Cu and Zr layers (thickness of 10 nm) were deposited by ion sputtering on Si substrate to the total thickness of 300 nm. The changes in the composition, surface morphology, and wetting properties after laser modification was monitored by Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM–EDS), optical profilometry, and wettability measurements. It was found that laser irradiation can induce the melting of material with the formation of wrinkled periodic structures at the edges of the laser spots in both systems as a consequence of the hydrodynamic effects. Another interesting result was that the periodic structure in form of LSFL (low spatial frequency LIPSS) ripples was numerous but slightly pronounced in Ti/Cu/Zr/Ti, due to the presence of the Zr component as an ultra-thin subsurface layer, which most likely favored creating LIPSS. Such laser texturing has been used in the biomedical field as a method of developing surface topography, coated with oxides to potentially improve cell response via suitable surface wetting for a biological system.",
journal = "Optical and Quantum Electronics",
title = "Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films",
volume = "54",
number = "9",
pages = "561",
doi = "10.1007/s11082-022-03910-6"
}

Božinović, N., Rajić, V., Kisić, D., Milovanović, D. S., Savović, J.,& Petrović, S.. (2022). Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films. in Optical and Quantum Electronics, 54(9), 561.
https://doi.org/10.1007/s11082-022-03910-6

Božinović N, Rajić V, Kisić D, Milovanović DS, Savović J, Petrović S. Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films. in Optical and Quantum Electronics. 2022;54(9):561.
doi:10.1007/s11082-022-03910-6 .

Božinović, Nevena, Rajić, Vladimir, Kisić, Danilo, Milovanović, Dubravka S., Savović, Jelena, Petrović, Suzana, "Laser surface texturing of Ti/Cu/Ti and Ti/Cu/Zr/Ti multilayers thin films" in Optical and Quantum Electronics, 54, no. 9 (2022):561,
https://doi.org/10.1007/s11082-022-03910-6 . .

TY  - CONF
AU  - Latas, Nemanja
AU  - Cvjetićanin, Nikola
AU  - Rajić, Vladimir
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12381
AB  - High demand for efficient storage devices has set a goal of improving the efficiency of lithium-ion batteries (LIBs), which currently represent the most promising energy storage devices . Most of the commercial LIBs today are composed of graphitic-based anodes, which are not suitable for high performance applications, such as electric vehicles. In this context, there is an increased interest in the development of novel anode materials, with enhanced kinetics. Such an electrode with enhanced capabilities could be TiO2 nanotube arrays (NTAs). In this paper, anatase TiO2 NTAs were prepared by anodization of a Ti foil in the solution of NH4F in glycerol at the voltage of 45 V and subsequent annealing at 400oC. The presence of anatase TiO2 was confirmed by Raman spectroscopy and the morphology was observed by scanning electron microscopy (SEM), while the electrochemical insertion of Liion in nanotubes was studied by means of cyclic voltammetry (CV) and galvanostatic (GS) charge-discharge experiments by exposing the electrode to the 1M solution of LiClO4 in propylene carbonate. The CV response was fast at all scan rates, up to 50 mV·s-1 , with characteristic Ti4+/Ti3+ redox peaks. The Ti/TiO2 NTAs electrode was GC cycled at different current densities (in orders 100, 50, 25 and again 100 µA·cm-2 ) at room temperature. After the initial 50 cycles the insertion/extraction capacity amounted 191.1/170.1 mAh·g-1 . By decreasing the current density, capacity significantly rises to 268.4/243.3 and 347.8/312.3 mAh·g-1 at 50 and 25 µA·cm-2 , respectively. After the last cycle at 100 µA·cm-2 , capacity amounts 188.9/168.1 mAh·g-1 , which is about 99% of the initial capacity. The diffusion coefficient of Li-ion was calculated to be 7.06·10-16 cm2 ·s-1 during deintercalation and 8.16·10-16 cm2 ·s-1 during intercalation.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - 20th Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
T1  - Lithium-ion insertion into anatase TiO2 nanotube arrays at room temperature
SP  - 34
EP  - 34
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12381
ER  - 

@conference{
author = "Latas, Nemanja and Cvjetićanin, Nikola and Rajić, Vladimir",
year = "2022",
abstract = "High demand for efficient storage devices has set a goal of improving the efficiency of lithium-ion batteries (LIBs), which currently represent the most promising energy storage devices . Most of the commercial LIBs today are composed of graphitic-based anodes, which are not suitable for high performance applications, such as electric vehicles. In this context, there is an increased interest in the development of novel anode materials, with enhanced kinetics. Such an electrode with enhanced capabilities could be TiO2 nanotube arrays (NTAs). In this paper, anatase TiO2 NTAs were prepared by anodization of a Ti foil in the solution of NH4F in glycerol at the voltage of 45 V and subsequent annealing at 400oC. The presence of anatase TiO2 was confirmed by Raman spectroscopy and the morphology was observed by scanning electron microscopy (SEM), while the electrochemical insertion of Liion in nanotubes was studied by means of cyclic voltammetry (CV) and galvanostatic (GS) charge-discharge experiments by exposing the electrode to the 1M solution of LiClO4 in propylene carbonate. The CV response was fast at all scan rates, up to 50 mV·s-1 , with characteristic Ti4+/Ti3+ redox peaks. The Ti/TiO2 NTAs electrode was GC cycled at different current densities (in orders 100, 50, 25 and again 100 µA·cm-2 ) at room temperature. After the initial 50 cycles the insertion/extraction capacity amounted 191.1/170.1 mAh·g-1 . By decreasing the current density, capacity significantly rises to 268.4/243.3 and 347.8/312.3 mAh·g-1 at 50 and 25 µA·cm-2 , respectively. After the last cycle at 100 µA·cm-2 , capacity amounts 188.9/168.1 mAh·g-1 , which is about 99% of the initial capacity. The diffusion coefficient of Li-ion was calculated to be 7.06·10-16 cm2 ·s-1 during deintercalation and 8.16·10-16 cm2 ·s-1 during intercalation.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "20th Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts",
title = "Lithium-ion insertion into anatase TiO2 nanotube arrays at room temperature",
pages = "34-34",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12381"
}

Latas, N., Cvjetićanin, N.,& Rajić, V.. (2022). Lithium-ion insertion into anatase TiO2 nanotube arrays at room temperature. in 20th Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts
Belgrade : Institute of Technical Sciences of SASA., 34-34.
https://hdl.handle.net/21.15107/rcub_vinar_12381

Latas N, Cvjetićanin N, Rajić V. Lithium-ion insertion into anatase TiO2 nanotube arrays at room temperature. in 20th Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts. 2022;:34-34.
https://hdl.handle.net/21.15107/rcub_vinar_12381 .

Latas, Nemanja, Cvjetićanin, Nikola, Rajić, Vladimir, "Lithium-ion insertion into anatase TiO2 nanotube arrays at room temperature" in 20th Young Researchers' Conference Materials Sciences and Engineering : program and the book of abstracts (2022):34-34,
https://hdl.handle.net/21.15107/rcub_vinar_12381 .

TY  - CONF
AU  - Popović, M.
AU  - Novaković, Mirjana M.
AU  - Rajić, Vladimir
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10905
AB  - The control of optical properties of titanium nitride is of great interest especially in the area of plasmonics where titanium nitride can successfully change and overcome most of the drawbacks of plasmonic metals [1,2]. In this study we have investigated the structural and optical changes of 260 nm thick TiN thin film induced by sequential implantation of 200 keV Au and 150 keV Ag ions. During implantation Au ion fluence was kept constant at 1.0×1016 ions/cm2 while the silver ion fluence was varied from 4.0×1016 ions/cm2 to 13×1016 ions/cm2 . After implantation the films were annealed at 500ºC, for 1 hour. The samples were analyzed by means of X-ray diffraction and spectroscopic ellipsometry measurements. The changes in dielectric function spectra of TiN induced by Au/Ag ion implantation and post-implantation annealing were analyzed and discussed in detail. The parameters of the fit including screened and unscreened plasma frequency as well as Drude broadening were studied with respect to the ion fluences and annealing temperature, and they were correlated with the structural changes of TiN. It was found that the real part of dielectric constant becomes less negative after implantation (Fig. 1a). Simultaneously, imaginary part decreases meaning that the titanium nitride possesses lower optical losses after implantation (Fig. 1b). Besides this, the overall metallic character of titanium nitride in the visible and near infrared region is retained. Further, we have demonstrated that subsequent annealing at 500°C continues to change the both real and imaginary part of dielectric constant in the same direction as in the case of ion implantation, thus leaving the films with much lower optical losses. Our findings suggest that the optical properties of the TiN films can be tailored by varying the ion fluence of incident metal ions as well as by post-implantation annealing processing.
PB  - Belgrade : Institute of Physics Belgrade
C3  - PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
T1  - Effect of Au/Ag ion implantation and subsequent thermal annealing on optical properties of titanium nitride thin films
SP  - 84
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10905
ER  - 

@conference{
author = "Popović, M. and Novaković, Mirjana M. and Rajić, Vladimir",
year = "2021",
abstract = "The control of optical properties of titanium nitride is of great interest especially in the area of plasmonics where titanium nitride can successfully change and overcome most of the drawbacks of plasmonic metals [1,2]. In this study we have investigated the structural and optical changes of 260 nm thick TiN thin film induced by sequential implantation of 200 keV Au and 150 keV Ag ions. During implantation Au ion fluence was kept constant at 1.0×1016 ions/cm2 while the silver ion fluence was varied from 4.0×1016 ions/cm2 to 13×1016 ions/cm2 . After implantation the films were annealed at 500ºC, for 1 hour. The samples were analyzed by means of X-ray diffraction and spectroscopic ellipsometry measurements. The changes in dielectric function spectra of TiN induced by Au/Ag ion implantation and post-implantation annealing were analyzed and discussed in detail. The parameters of the fit including screened and unscreened plasma frequency as well as Drude broadening were studied with respect to the ion fluences and annealing temperature, and they were correlated with the structural changes of TiN. It was found that the real part of dielectric constant becomes less negative after implantation (Fig. 1a). Simultaneously, imaginary part decreases meaning that the titanium nitride possesses lower optical losses after implantation (Fig. 1b). Besides this, the overall metallic character of titanium nitride in the visible and near infrared region is retained. Further, we have demonstrated that subsequent annealing at 500°C continues to change the both real and imaginary part of dielectric constant in the same direction as in the case of ion implantation, thus leaving the films with much lower optical losses. Our findings suggest that the optical properties of the TiN films can be tailored by varying the ion fluence of incident metal ions as well as by post-implantation annealing processing.",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade",
title = "Effect of Au/Ag ion implantation and subsequent thermal annealing on optical properties of titanium nitride thin films",
pages = "84",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10905"
}

Popović, M., Novaković, M. M.,& Rajić, V.. (2021). Effect of Au/Ag ion implantation and subsequent thermal annealing on optical properties of titanium nitride thin films. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
Belgrade : Institute of Physics Belgrade., 84.
https://hdl.handle.net/21.15107/rcub_vinar_10905

Popović M, Novaković MM, Rajić V. Effect of Au/Ag ion implantation and subsequent thermal annealing on optical properties of titanium nitride thin films. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade. 2021;:84.
https://hdl.handle.net/21.15107/rcub_vinar_10905 .

Popović, M., Novaković, Mirjana M., Rajić, Vladimir, "Effect of Au/Ag ion implantation and subsequent thermal annealing on optical properties of titanium nitride thin films" in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade (2021):84,
https://hdl.handle.net/21.15107/rcub_vinar_10905 .

TY  - CONF
AU  - Božinović, Nevena
AU  - Milovanović, Dubravka S.
AU  - Rajić, Vladimir
AU  - Rakočević, Lazar
AU  - Savović, Jelena
AU  - Petrović, Suzana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10913
AB  - Design of surface patterning with the co-existence of micro- and nanoscale features by picosecond laser processing is investigated in order to improve cell integration. New biomedical Ti alloys with a high concentration of β-stabilizer elements (zirconium) are developed, as potential solutions to the mismatch between the Young’s modulus of the implant and the surrounding hard tissues. On the other hand, in order to enhance the tribological and antimicrobial properties of Ti/Zr coating, a novel titanium-copper and titanium-copper-zirconium thin film systems were designed in this work. Novel composite structure composed of subsurface distributed Cu and Zr layers (thickness of 10 nm), with satisfying mechanical properties and moderate biocompatibility, were deposited by ion sputtering on Si substrate to the total thickness of 300 nm. The multilayer thin films were irradiated by focused linearly p-polarised picosecond pulses with follow characteristics: repetition rate of 10 Hz, pulse duration equal to 150 ps, central wavelength of 1064 nm and 120 µm Gaussian spot diameter. The changes of the composition and surface morphology in the Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films were monitored by X-ray photoelectron spectroscopy (XPS), by scanning electron microscopy (SEM) and by profilometry. The main part of the absorbed laser energy was rapidly transformed into heat, producing intensive modifications of composition and morphology on the multilayer surface [1,2]. The results show an increase in surface roughness, formation of a specific surface topography, appearance of hydrodynamic features and ablation of surface material. XPS analysis revealed that laser modification was induced intermixing between the Cu and Zr layers, but also with dominant Ti component. During the laser processing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films, delivered energy was sufficient to cause solid-state reactions, the formation of alloy between components. Laser processing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films is used to create the arrayed surface structure, such as laser-induced periodic surface structures (LIPSS) and at the same time to induce mixing of components inside the thin film structures, as well as the formation of ultrathin oxide layer at the laser-treated surfaces [3,4]. Laser surface patterns are organized as networks and parallel lines, where lines formed of LIPSS are wide up to 100 μm and distance between lines are less than 300 μm. The average periodicity between LIPSSs was about 900 nm, which would correspond to the formation of low spatial frequency LIPSS (LSFL).
PB  - Belgrade : Institute of Physics Belgrade
C3  - PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
T1  - Laser surface texturing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films
SP  - 153
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10913
ER  - 

@conference{
author = "Božinović, Nevena and Milovanović, Dubravka S. and Rajić, Vladimir and Rakočević, Lazar and Savović, Jelena and Petrović, Suzana",
year = "2021",
abstract = "Design of surface patterning with the co-existence of micro- and nanoscale features by picosecond laser processing is investigated in order to improve cell integration. New biomedical Ti alloys with a high concentration of β-stabilizer elements (zirconium) are developed, as potential solutions to the mismatch between the Young’s modulus of the implant and the surrounding hard tissues. On the other hand, in order to enhance the tribological and antimicrobial properties of Ti/Zr coating, a novel titanium-copper and titanium-copper-zirconium thin film systems were designed in this work. Novel composite structure composed of subsurface distributed Cu and Zr layers (thickness of 10 nm), with satisfying mechanical properties and moderate biocompatibility, were deposited by ion sputtering on Si substrate to the total thickness of 300 nm. The multilayer thin films were irradiated by focused linearly p-polarised picosecond pulses with follow characteristics: repetition rate of 10 Hz, pulse duration equal to 150 ps, central wavelength of 1064 nm and 120 µm Gaussian spot diameter. The changes of the composition and surface morphology in the Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films were monitored by X-ray photoelectron spectroscopy (XPS), by scanning electron microscopy (SEM) and by profilometry. The main part of the absorbed laser energy was rapidly transformed into heat, producing intensive modifications of composition and morphology on the multilayer surface [1,2]. The results show an increase in surface roughness, formation of a specific surface topography, appearance of hydrodynamic features and ablation of surface material. XPS analysis revealed that laser modification was induced intermixing between the Cu and Zr layers, but also with dominant Ti component. During the laser processing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films, delivered energy was sufficient to cause solid-state reactions, the formation of alloy between components. Laser processing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films is used to create the arrayed surface structure, such as laser-induced periodic surface structures (LIPSS) and at the same time to induce mixing of components inside the thin film structures, as well as the formation of ultrathin oxide layer at the laser-treated surfaces [3,4]. Laser surface patterns are organized as networks and parallel lines, where lines formed of LIPSS are wide up to 100 μm and distance between lines are less than 300 μm. The average periodicity between LIPSSs was about 900 nm, which would correspond to the formation of low spatial frequency LIPSS (LSFL).",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade",
title = "Laser surface texturing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films",
pages = "153",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10913"
}

Božinović, N., Milovanović, D. S., Rajić, V., Rakočević, L., Savović, J.,& Petrović, S.. (2021). Laser surface texturing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
Belgrade : Institute of Physics Belgrade., 153.
https://hdl.handle.net/21.15107/rcub_vinar_10913

Božinović N, Milovanović DS, Rajić V, Rakočević L, Savović J, Petrović S. Laser surface texturing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade. 2021;:153.
https://hdl.handle.net/21.15107/rcub_vinar_10913 .

Božinović, Nevena, Milovanović, Dubravka S., Rajić, Vladimir, Rakočević, Lazar, Savović, Jelena, Petrović, Suzana, "Laser surface texturing of Ti/Cu/Ti/Si and Ti/Cu/Zr/Ti/Si multilayer thin films" in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade (2021):153,
https://hdl.handle.net/21.15107/rcub_vinar_10913 .

TY  - CONF
AU  - Petrović, Suzana
AU  - Peruško, Davor
AU  - Mimidis, A.
AU  - Kavatzikidou, P.
AU  - Manousaki, A.
AU  - Božinović, Nevena
AU  - Rajić, Vladimir
AU  - Stratakis, E.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10914
AB  - The experimental study of the static and dynamic femtosecond laser ablation of the multilayer 15x(Ti/Cr)/Si system is reported. The layer-by-layer selective laser ablation mechanism was studied by analysis of the surface morphology and elemental composition in static single pulse irradiation in a range of pulse energy from 10 – 17 μJ. The selective ablations as number of concentric circles in modified spots are increased with the pulse energy. The boundary between the circles was shown a change in the depth, comparable to the thickness of the individual layers. Changes in the elemental composition at the edges are associated with the removal of the layer by layer. Due to the intermixing of components and higher content of oxygen in the central area of ablated spots, it is expected that an ultra-thin layer composed of Ti and Cr oxide phases is formed at the bottom of the ablated center. The dynamic multi-pulse irradiation was observed via the production of lines with laser-induced periodic surface structures (LIPSS) at different laser parameters (scan velocities and laser polarization). The spatial periodicity of the formed LIPSS depends on changes in the effective number of pulses and laser polarization, as well as the nature of the material. The formation of LIPSS is followed with the significant ablation of multilayer 15x(Ti/Cr)/Si system, without visible hydrodynamic features, but ripples are somewhere covered with nanoparticles dimension up to 100 nm. The main focus of this experimental study was examined a novel Ti/Cr nanolayered composite in order to create a biomimetic surface with suitable composition and structure for cell integration. Using SEM and confocal microscopy images of the laser modified surfaces with seeded cell culture (NIH 3T3 fibroblasts) was found that cell adhesion and their growth depend on the surface composition and morphological forms. These results indicated a good adhesion and proliferation of cells after two and four days, with some tendency of grouping of cells on the laser modified surfaces.
PB  - Belgrade : Institute of Physics Belgrade
C3  - PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
T1  - The surface array structures induced by femtosecond laser modifications of Ti/Cr multilayer thin films for biomedical applications
SP  - 156
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10914
ER  - 

@conference{
author = "Petrović, Suzana and Peruško, Davor and Mimidis, A. and Kavatzikidou, P. and Manousaki, A. and Božinović, Nevena and Rajić, Vladimir and Stratakis, E.",
year = "2021",
abstract = "The experimental study of the static and dynamic femtosecond laser ablation of the multilayer 15x(Ti/Cr)/Si system is reported. The layer-by-layer selective laser ablation mechanism was studied by analysis of the surface morphology and elemental composition in static single pulse irradiation in a range of pulse energy from 10 – 17 μJ. The selective ablations as number of concentric circles in modified spots are increased with the pulse energy. The boundary between the circles was shown a change in the depth, comparable to the thickness of the individual layers. Changes in the elemental composition at the edges are associated with the removal of the layer by layer. Due to the intermixing of components and higher content of oxygen in the central area of ablated spots, it is expected that an ultra-thin layer composed of Ti and Cr oxide phases is formed at the bottom of the ablated center. The dynamic multi-pulse irradiation was observed via the production of lines with laser-induced periodic surface structures (LIPSS) at different laser parameters (scan velocities and laser polarization). The spatial periodicity of the formed LIPSS depends on changes in the effective number of pulses and laser polarization, as well as the nature of the material. The formation of LIPSS is followed with the significant ablation of multilayer 15x(Ti/Cr)/Si system, without visible hydrodynamic features, but ripples are somewhere covered with nanoparticles dimension up to 100 nm. The main focus of this experimental study was examined a novel Ti/Cr nanolayered composite in order to create a biomimetic surface with suitable composition and structure for cell integration. Using SEM and confocal microscopy images of the laser modified surfaces with seeded cell culture (NIH 3T3 fibroblasts) was found that cell adhesion and their growth depend on the surface composition and morphological forms. These results indicated a good adhesion and proliferation of cells after two and four days, with some tendency of grouping of cells on the laser modified surfaces.",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade",
title = "The surface array structures induced by femtosecond laser modifications of Ti/Cr multilayer thin films for biomedical applications",
pages = "156",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10914"
}

Petrović, S., Peruško, D., Mimidis, A., Kavatzikidou, P., Manousaki, A., Božinović, N., Rajić, V.,& Stratakis, E.. (2021). The surface array structures induced by femtosecond laser modifications of Ti/Cr multilayer thin films for biomedical applications. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
Belgrade : Institute of Physics Belgrade., 156.
https://hdl.handle.net/21.15107/rcub_vinar_10914

Petrović S, Peruško D, Mimidis A, Kavatzikidou P, Manousaki A, Božinović N, Rajić V, Stratakis E. The surface array structures induced by femtosecond laser modifications of Ti/Cr multilayer thin films for biomedical applications. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade. 2021;:156.
https://hdl.handle.net/21.15107/rcub_vinar_10914 .

Petrović, Suzana, Peruško, Davor, Mimidis, A., Kavatzikidou, P., Manousaki, A., Božinović, Nevena, Rajić, Vladimir, Stratakis, E., "The surface array structures induced by femtosecond laser modifications of Ti/Cr multilayer thin films for biomedical applications" in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade (2021):156,
https://hdl.handle.net/21.15107/rcub_vinar_10914 .

TY  - JOUR
AU  - Rajić, Vladimir
AU  - Simatović Stojković, Ivana
AU  - Veselinović, Ljiljana M.
AU  - Belošević-Čavor, Jelena
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
AU  - Škapin, Srečo Davor
AU  - Mojović, Miloš
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Častvan Janković, Ivona
AU  - Marković, Smilja
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9679
AB  - Eco-friendly and rapid microwave processing of a precipitate was used to produce Fe-doped zinc oxide (Zn1−xFexO, x = 0, 0.05, 0.1, 0.15 and 0.20; ZnO:Fe) nanoparticles, which were tested as catalysts toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a moderately alkaline solution. The phase composition, crystal structure, morphology, textural properties, surface chemistry, optical properties and band structure were examined to comprehend the influence of Zn2+ partial substitution with Fe3+ on the catalytic activity of ZnO:Fe. Linear sweep voltammetry showed an improved catalytic activity of ZnO:5Fe toward the ORR, compared to pure ZnO, while with increased amounts of the Fe-dopant the activity decreased. The improvement was suggested by a more positive onset potential (0.394 V vs. RHE), current density (0.231 mA cm−2 at 0.150 V vs. RHE), and faster kinetics (Tafel slope, b = 248 mV dec−1), and it may be due to the synergistic effect of (1) a sufficient amount of surface oxygen vacancies, and (2) a certain amount of plate-like particles composed of crystallites with well developed (0001) and (000) facets. Quite the contrary, the OER study showed that the introduction of Fe3+ ions into the ZnO crystal structure resulted in enhanced catalytic activity of all ZnO:Fe samples, compared to pure ZnO, probably due to the modified binding energy and an optimized band structure. With the maximal current density of 1.066 mA cm−2 at 2.216 V vs. RHE, an onset potential of 1.856 V vs. RHE, and the smallest potential difference between the OER and ORR (ΔE = 1.58 V), ZnO:10Fe may be considered a promising bifunctional catalyst toward the OER/ORR in moderately alkaline solution. This study demonstrates that the electrocatalytic activity of ZnO:Fe strongly depends on the defect chemistry and consequently the band structure. Along with providing fundamental insight into the electrocatalytic activity of ZnO:Fe, the study also indicates an optimal stoichiometry for enhanced bifunctional activity toward the OER/ORR, compared to pure ZnO.
T2  - Physical Chemistry Chemical Physics
T1  - Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry
VL  - 22
IS  - 38
SP  - 22078
EP  - 22095
DO  - 10.1039/D0CP03377D
ER  - 

@article{
author = "Rajić, Vladimir and Simatović Stojković, Ivana and Veselinović, Ljiljana M. and Belošević-Čavor, Jelena and Novaković, Mirjana M. and Popović, Maja and Škapin, Srečo Davor and Mojović, Miloš and Stojadinović, Stevan and Rac, Vladislav and Častvan Janković, Ivona and Marković, Smilja",
year = "2020",
abstract = "Eco-friendly and rapid microwave processing of a precipitate was used to produce Fe-doped zinc oxide (Zn1−xFexO, x = 0, 0.05, 0.1, 0.15 and 0.20; ZnO:Fe) nanoparticles, which were tested as catalysts toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a moderately alkaline solution. The phase composition, crystal structure, morphology, textural properties, surface chemistry, optical properties and band structure were examined to comprehend the influence of Zn2+ partial substitution with Fe3+ on the catalytic activity of ZnO:Fe. Linear sweep voltammetry showed an improved catalytic activity of ZnO:5Fe toward the ORR, compared to pure ZnO, while with increased amounts of the Fe-dopant the activity decreased. The improvement was suggested by a more positive onset potential (0.394 V vs. RHE), current density (0.231 mA cm−2 at 0.150 V vs. RHE), and faster kinetics (Tafel slope, b = 248 mV dec−1), and it may be due to the synergistic effect of (1) a sufficient amount of surface oxygen vacancies, and (2) a certain amount of plate-like particles composed of crystallites with well developed (0001) and (000) facets. Quite the contrary, the OER study showed that the introduction of Fe3+ ions into the ZnO crystal structure resulted in enhanced catalytic activity of all ZnO:Fe samples, compared to pure ZnO, probably due to the modified binding energy and an optimized band structure. With the maximal current density of 1.066 mA cm−2 at 2.216 V vs. RHE, an onset potential of 1.856 V vs. RHE, and the smallest potential difference between the OER and ORR (ΔE = 1.58 V), ZnO:10Fe may be considered a promising bifunctional catalyst toward the OER/ORR in moderately alkaline solution. This study demonstrates that the electrocatalytic activity of ZnO:Fe strongly depends on the defect chemistry and consequently the band structure. Along with providing fundamental insight into the electrocatalytic activity of ZnO:Fe, the study also indicates an optimal stoichiometry for enhanced bifunctional activity toward the OER/ORR, compared to pure ZnO.",
journal = "Physical Chemistry Chemical Physics",
title = "Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry",
volume = "22",
number = "38",
pages = "22078-22095",
doi = "10.1039/D0CP03377D"
}

Rajić, V., Simatović Stojković, I., Veselinović, L. M., Belošević-Čavor, J., Novaković, M. M., Popović, M., Škapin, S. D., Mojović, M., Stojadinović, S., Rac, V., Častvan Janković, I.,& Marković, S.. (2020). Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry. in Physical Chemistry Chemical Physics, 22(38), 22078-22095.
https://doi.org/10.1039/D0CP03377D

Rajić V, Simatović Stojković I, Veselinović LM, Belošević-Čavor J, Novaković MM, Popović M, Škapin SD, Mojović M, Stojadinović S, Rac V, Častvan Janković I, Marković S. Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry. in Physical Chemistry Chemical Physics. 2020;22(38):22078-22095.
doi:10.1039/D0CP03377D .

Rajić, Vladimir, Simatović Stojković, Ivana, Veselinović, Ljiljana M., Belošević-Čavor, Jelena, Novaković, Mirjana M., Popović, Maja, Škapin, Srečo Davor, Mojović, Miloš, Stojadinović, Stevan, Rac, Vladislav, Častvan Janković, Ivona, Marković, Smilja, "Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry" in Physical Chemistry Chemical Physics, 22, no. 38 (2020):22078-22095,
https://doi.org/10.1039/D0CP03377D . .

TY  - JOUR
AU  - Ivanovski, Valentin N.
AU  - Belošević-Čavor, Jelena
AU  - Rajić, Vladimir
AU  - Umićević, Ana
AU  - Marković, Smilja
AU  - Kusigerski, Vladan
AU  - Mitrić, Miodrag
AU  - Koteski, Vasil J.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8515
AB  - In order to study the effect of Fe cation substitution on the local structure, defect formation, and hyperfine interactions in ZnO, Mössbauer spectroscopy measurements of the microwave processed Zn 1 - x Fe x O (x = 0.05, 0.10, 0.15, and 0.20) nanoparticles, together with ab initio calculations, were performed. Complementary information on the distribution of particle size and morphology, as well as magnetic properties, were obtained by X-ray diffraction, transmission electron microscopy, and squid-magnetometry. The selected model for analyzing the Mössbauer spectra of our samples is a distribution of quadrupole splittings. The fitting model with two Lorentz doublets was rejected due to its failure to include larger doublets. The Fe 3 + ions do not yield magnetic ordering in the samples at room temperature. The results from first-principles calculations confirm that the major component of the Mössbauer spectra corresponds to the Fe-alloyed ZnO with Zn vacancy in the next nearest neighbor environment. The magnetic measurements are consistent with the description of the distribution of iron ions over the randomly formed clusters in the ZnO host lattice. While at room temperature all the samples are paramagnetic, magnetic interactions cause a transition into a cluster spin-glass state at low temperatures. © 2019 Author(s).
T2  - Journal of Applied Physics
T1  - A study of defect structures in Fe-alloyed ZnO: Morphology, magnetism, and hyperfine interactions
VL  - 126
IS  - 12
SP  - 125703
DO  - 10.1063/1.5095837
ER  - 

@article{
author = "Ivanovski, Valentin N. and Belošević-Čavor, Jelena and Rajić, Vladimir and Umićević, Ana and Marković, Smilja and Kusigerski, Vladan and Mitrić, Miodrag and Koteski, Vasil J.",
year = "2019",
abstract = "In order to study the effect of Fe cation substitution on the local structure, defect formation, and hyperfine interactions in ZnO, Mössbauer spectroscopy measurements of the microwave processed Zn 1 - x Fe x O (x = 0.05, 0.10, 0.15, and 0.20) nanoparticles, together with ab initio calculations, were performed. Complementary information on the distribution of particle size and morphology, as well as magnetic properties, were obtained by X-ray diffraction, transmission electron microscopy, and squid-magnetometry. The selected model for analyzing the Mössbauer spectra of our samples is a distribution of quadrupole splittings. The fitting model with two Lorentz doublets was rejected due to its failure to include larger doublets. The Fe 3 + ions do not yield magnetic ordering in the samples at room temperature. The results from first-principles calculations confirm that the major component of the Mössbauer spectra corresponds to the Fe-alloyed ZnO with Zn vacancy in the next nearest neighbor environment. The magnetic measurements are consistent with the description of the distribution of iron ions over the randomly formed clusters in the ZnO host lattice. While at room temperature all the samples are paramagnetic, magnetic interactions cause a transition into a cluster spin-glass state at low temperatures. © 2019 Author(s).",
journal = "Journal of Applied Physics",
title = "A study of defect structures in Fe-alloyed ZnO: Morphology, magnetism, and hyperfine interactions",
volume = "126",
number = "12",
pages = "125703",
doi = "10.1063/1.5095837"
}

Ivanovski, V. N., Belošević-Čavor, J., Rajić, V., Umićević, A., Marković, S., Kusigerski, V., Mitrić, M.,& Koteski, V. J.. (2019). A study of defect structures in Fe-alloyed ZnO: Morphology, magnetism, and hyperfine interactions. in Journal of Applied Physics, 126(12), 125703.
https://doi.org/10.1063/1.5095837

Ivanovski VN, Belošević-Čavor J, Rajić V, Umićević A, Marković S, Kusigerski V, Mitrić M, Koteski VJ. A study of defect structures in Fe-alloyed ZnO: Morphology, magnetism, and hyperfine interactions. in Journal of Applied Physics. 2019;126(12):125703.
doi:10.1063/1.5095837 .

Ivanovski, Valentin N., Belošević-Čavor, Jelena, Rajić, Vladimir, Umićević, Ana, Marković, Smilja, Kusigerski, Vladan, Mitrić, Miodrag, Koteski, Vasil J., "A study of defect structures in Fe-alloyed ZnO: Morphology, magnetism, and hyperfine interactions" in Journal of Applied Physics, 126, no. 12 (2019):125703,
https://doi.org/10.1063/1.5095837 . .

TY  - JOUR
AU  - Marković, Smilja
AU  - Rajić, Vladimir
AU  - Stanković, Ana
AU  - Veselinović, Ljiljana M.
AU  - Belošević-Čavor, Jelena
AU  - Batalović, Katarina
AU  - Abazović, Nadica
AU  - Škapin, Srečo Davor
AU  - Uskoković, Dragan
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/963
AB  - ZnO spheroidal nanoparticles, synthesized by microwave processing, were used for preparation of composites with polyethylene oxide (PEO). The phase purity and crystal structure of the composites were investigated by X-ray diffraction (XRD) and Raman spectroscopy. The composites particles morphology and size distributions were studied by FE-SEM and laser diffraction particle size analyzer, respectively. The optical properties were studied using UV Vis diffuse reflectance and photoluminescence spectroscopy. It is found that in the wavelength range 550-800 nm, ZnO and ZnO/PEO composites absorb about 50% of the incident light intensity. Also red-shift of band gap energy (0.12-0.15 eV) compared to bulk ZnO was determined. The effect of PEO molecular weights, 200,000, 600,000 and 900,000 g/mol, on photocatalytic activity of ZnO/PEO composites were examined via de-colorization of methylene blue (MB) under direct sunlight irradiation. A large efficiency of MB de-colorization was found after 6 h of irradiation. The enhanced photocatalytic activity of ZnO/PEO composites is attributed to the: (1) lattice defects introduced in ZnO crystal structure by rapid microwave processing, and (2) presence of PEO as a source of oxygen interstitials. In order to confirm and further clarify the experimental results ab initio calculations based on density functional theory (DFT) were performed. (C) 2016 Elsevier Ltd. All rights reserved.
PB  - Elsevier
T2  - Solar Energy
T1  - Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites
VL  - 127
SP  - 124
EP  - 135
DO  - 10.1016/j.solener.2016.01.026
ER  - 

@article{
author = "Marković, Smilja and Rajić, Vladimir and Stanković, Ana and Veselinović, Ljiljana M. and Belošević-Čavor, Jelena and Batalović, Katarina and Abazović, Nadica and Škapin, Srečo Davor and Uskoković, Dragan",
year = "2016",
abstract = "ZnO spheroidal nanoparticles, synthesized by microwave processing, were used for preparation of composites with polyethylene oxide (PEO). The phase purity and crystal structure of the composites were investigated by X-ray diffraction (XRD) and Raman spectroscopy. The composites particles morphology and size distributions were studied by FE-SEM and laser diffraction particle size analyzer, respectively. The optical properties were studied using UV Vis diffuse reflectance and photoluminescence spectroscopy. It is found that in the wavelength range 550-800 nm, ZnO and ZnO/PEO composites absorb about 50% of the incident light intensity. Also red-shift of band gap energy (0.12-0.15 eV) compared to bulk ZnO was determined. The effect of PEO molecular weights, 200,000, 600,000 and 900,000 g/mol, on photocatalytic activity of ZnO/PEO composites were examined via de-colorization of methylene blue (MB) under direct sunlight irradiation. A large efficiency of MB de-colorization was found after 6 h of irradiation. The enhanced photocatalytic activity of ZnO/PEO composites is attributed to the: (1) lattice defects introduced in ZnO crystal structure by rapid microwave processing, and (2) presence of PEO as a source of oxygen interstitials. In order to confirm and further clarify the experimental results ab initio calculations based on density functional theory (DFT) were performed. (C) 2016 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier",
journal = "Solar Energy",
title = "Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites",
volume = "127",
pages = "124-135",
doi = "10.1016/j.solener.2016.01.026"
}

Marković, S., Rajić, V., Stanković, A., Veselinović, L. M., Belošević-Čavor, J., Batalović, K., Abazović, N., Škapin, S. D.,& Uskoković, D.. (2016). Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites. in Solar Energy
Elsevier., 127, 124-135.
https://doi.org/10.1016/j.solener.2016.01.026

Marković S, Rajić V, Stanković A, Veselinović LM, Belošević-Čavor J, Batalović K, Abazović N, Škapin SD, Uskoković D. Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites. in Solar Energy. 2016;127:124-135.
doi:10.1016/j.solener.2016.01.026 .

Marković, Smilja, Rajić, Vladimir, Stanković, Ana, Veselinović, Ljiljana M., Belošević-Čavor, Jelena, Batalović, Katarina, Abazović, Nadica, Škapin, Srečo Davor, Uskoković, Dragan, "Effect of PEO molecular weight on sunlight induced photocatalytic activity of ZnO/PEO composites" in Solar Energy, 127 (2016):124-135,
https://doi.org/10.1016/j.solener.2016.01.026 . .