TY  - JOUR
AU  - Popović, Maja
AU  - Novaković, Mirjana
AU  - Pjević, Dejan
AU  - Vana, Dušan
AU  - Jugović, Dragana
AU  - Tošić, Dragana
AU  - Noga, Pavol
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12279
AB  - In the present paper, the effects of metal ion implantation on the structural and optical properties of TiN thin films have been investigated. TiN films of 170 nm thickness were grown by d.c. reactive sputtering on Si (100) wafers and then irradiated at 5 × 1016 ions/cm2 with either Au, Ag, or Cu ions by using two different energies per each implanted metal. The results showed that as deposited TiN crystallizes in the form of a fcc cubic structure, with the crystallites preferentially oriented along the (111) plane. For all implanted layers, the cubic structure was preserved, but compared to as deposited TiN the crystallites were smaller and the lattice was contracted. These changes were correlated with the depth distribution of Au, Ag and Cu ions and assigned to implantation-induced damage that was larger when higher ion energies were used. High-resolution XPS spectra of the surface of as deposited sample showed the coexistence of TiN, TiO2 and TiOxNy phases and this was related to the surface oxidation of the films due to the exposure to air. After implantation, the results were almost similar for all metals, showing an increase in TiO2 contribution and the formation of pure metallic Au and Ag phases, while copper is in the Cu2+ state, which is attributed to Cu(II)-oxide and Cu(OH)2. The microstructural characteristics including defect formation, changes in crystallite size and lattice contraction, and also growth of different metallic phases during implantations were correlated with the findings of the optical characterization of the implanted films. For the as deposited film we found an energy gap of 2.91 eV, which was lower than the value typical for TiN. After implantation the gap was shifted to higher energies, while at the visible part of the region, the existence of additional energy levels, at photon energies below 2.9 eV was observed. Besides, all implanted films showed degraded photocatalytic activity compared to as deposited TiN, among which Cu-implanted samples exhibited the best photocatalytic performances. The lower photocatalytic activity of Au and Ag implanted films compared to Cu implantations was ascribed to larger structural defects and the formation of less favorable electronic states.
T2  - Journal of Alloys and Compounds
T1  - Investigating on the microstructure and optical properties of Au, Ag and Cu implanted TiN thin films: The effects of surface oxidation and ion-induced defects
VL  - 976
SP  - 173046
DO  - 10.1016/j.jallcom.2023.173046
ER  - 

@article{
author = "Popović, Maja and Novaković, Mirjana and Pjević, Dejan and Vana, Dušan and Jugović, Dragana and Tošić, Dragana and Noga, Pavol",
year = "2024",
abstract = "In the present paper, the effects of metal ion implantation on the structural and optical properties of TiN thin films have been investigated. TiN films of 170 nm thickness were grown by d.c. reactive sputtering on Si (100) wafers and then irradiated at 5 × 1016 ions/cm2 with either Au, Ag, or Cu ions by using two different energies per each implanted metal. The results showed that as deposited TiN crystallizes in the form of a fcc cubic structure, with the crystallites preferentially oriented along the (111) plane. For all implanted layers, the cubic structure was preserved, but compared to as deposited TiN the crystallites were smaller and the lattice was contracted. These changes were correlated with the depth distribution of Au, Ag and Cu ions and assigned to implantation-induced damage that was larger when higher ion energies were used. High-resolution XPS spectra of the surface of as deposited sample showed the coexistence of TiN, TiO2 and TiOxNy phases and this was related to the surface oxidation of the films due to the exposure to air. After implantation, the results were almost similar for all metals, showing an increase in TiO2 contribution and the formation of pure metallic Au and Ag phases, while copper is in the Cu2+ state, which is attributed to Cu(II)-oxide and Cu(OH)2. The microstructural characteristics including defect formation, changes in crystallite size and lattice contraction, and also growth of different metallic phases during implantations were correlated with the findings of the optical characterization of the implanted films. For the as deposited film we found an energy gap of 2.91 eV, which was lower than the value typical for TiN. After implantation the gap was shifted to higher energies, while at the visible part of the region, the existence of additional energy levels, at photon energies below 2.9 eV was observed. Besides, all implanted films showed degraded photocatalytic activity compared to as deposited TiN, among which Cu-implanted samples exhibited the best photocatalytic performances. The lower photocatalytic activity of Au and Ag implanted films compared to Cu implantations was ascribed to larger structural defects and the formation of less favorable electronic states.",
journal = "Journal of Alloys and Compounds",
title = "Investigating on the microstructure and optical properties of Au, Ag and Cu implanted TiN thin films: The effects of surface oxidation and ion-induced defects",
volume = "976",
pages = "173046",
doi = "10.1016/j.jallcom.2023.173046"
}

Popović, M., Novaković, M., Pjević, D., Vana, D., Jugović, D., Tošić, D.,& Noga, P.. (2024). Investigating on the microstructure and optical properties of Au, Ag and Cu implanted TiN thin films: The effects of surface oxidation and ion-induced defects. in Journal of Alloys and Compounds, 976, 173046.
https://doi.org/10.1016/j.jallcom.2023.173046

Popović M, Novaković M, Pjević D, Vana D, Jugović D, Tošić D, Noga P. Investigating on the microstructure and optical properties of Au, Ag and Cu implanted TiN thin films: The effects of surface oxidation and ion-induced defects. in Journal of Alloys and Compounds. 2024;976:173046.
doi:10.1016/j.jallcom.2023.173046 .

Popović, Maja, Novaković, Mirjana, Pjević, Dejan, Vana, Dušan, Jugović, Dragana, Tošić, Dragana, Noga, Pavol, "Investigating on the microstructure and optical properties of Au, Ag and Cu implanted TiN thin films: The effects of surface oxidation and ion-induced defects" in Journal of Alloys and Compounds, 976 (2024):173046,
https://doi.org/10.1016/j.jallcom.2023.173046 . .

TY  - JOUR
AU  - Prekodravac, Jovana
AU  - Vasiljević, Bojana R.
AU  - Žakula, Jelena
AU  - Popović, Maja
AU  - Pavlović, Vladimir
AU  - Ciasca, Gabriele
AU  - Romanò, Sabrina
AU  - Todorović Marković, Biljana
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12446
AB  - Carbon quantum dots (CQDs) have exceptional physical-chemical properties that make them suitable for a wide range of uses, such as the photocatalytic removal of organic contaminants from water. Here, we provide a one-step, ecologically friendly, and economical method for creating iron/nitrogen co-doped (Fe/N-CQD) and nitrogen-doped (N-CQD) quantum dot nanomaterials. The characteristics of the developed nanomaterials were investigated with regard to how surface chemistry impacts their capacity for adsorption and photoactivity in a case study of a specific water pollutant reduction. The influence of the two irradiation sources-operating in the UV and visible ranges-on the photoactivity of materials was highlighted. Finally, their eco-friendliness was examined on four different human tumor cell lines.
T2  - Optical Materials
T1  - Carbon quantum dots surface chemistry: Evaluation of Photo and Cytotoxic activity
VL  - 147
SP  - 114629
DO  - 10.1016/j.optmat.2023.114629
ER  - 

@article{
author = "Prekodravac, Jovana and Vasiljević, Bojana R. and Žakula, Jelena and Popović, Maja and Pavlović, Vladimir and Ciasca, Gabriele and Romanò, Sabrina and Todorović Marković, Biljana",
year = "2024",
abstract = "Carbon quantum dots (CQDs) have exceptional physical-chemical properties that make them suitable for a wide range of uses, such as the photocatalytic removal of organic contaminants from water. Here, we provide a one-step, ecologically friendly, and economical method for creating iron/nitrogen co-doped (Fe/N-CQD) and nitrogen-doped (N-CQD) quantum dot nanomaterials. The characteristics of the developed nanomaterials were investigated with regard to how surface chemistry impacts their capacity for adsorption and photoactivity in a case study of a specific water pollutant reduction. The influence of the two irradiation sources-operating in the UV and visible ranges-on the photoactivity of materials was highlighted. Finally, their eco-friendliness was examined on four different human tumor cell lines.",
journal = "Optical Materials",
title = "Carbon quantum dots surface chemistry: Evaluation of Photo and Cytotoxic activity",
volume = "147",
pages = "114629",
doi = "10.1016/j.optmat.2023.114629"
}

Prekodravac, J., Vasiljević, B. R., Žakula, J., Popović, M., Pavlović, V., Ciasca, G., Romanò, S.,& Todorović Marković, B.. (2024). Carbon quantum dots surface chemistry: Evaluation of Photo and Cytotoxic activity. in Optical Materials, 147, 114629.
https://doi.org/10.1016/j.optmat.2023.114629

Prekodravac J, Vasiljević BR, Žakula J, Popović M, Pavlović V, Ciasca G, Romanò S, Todorović Marković B. Carbon quantum dots surface chemistry: Evaluation of Photo and Cytotoxic activity. in Optical Materials. 2024;147:114629.
doi:10.1016/j.optmat.2023.114629 .

Prekodravac, Jovana, Vasiljević, Bojana R., Žakula, Jelena, Popović, Maja, Pavlović, Vladimir, Ciasca, Gabriele, Romanò, Sabrina, Todorović Marković, Biljana, "Carbon quantum dots surface chemistry: Evaluation of Photo and Cytotoxic activity" in Optical Materials, 147 (2024):114629,
https://doi.org/10.1016/j.optmat.2023.114629 . .

TY  - CONF
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11556
PB  - Belgrade : Vinča Institute of Nuclear Sciences – National Institute of the Republic of Serbia, University of Belgrade
T1  - Photonica2023 : IX International School and Conference on Photonics : Book of Abstracts
SP  - XV, 155
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11556
ER  - 

@conference{
editor = "Potočnik, Jelena, Popović, Maja, Božanić, Dušan K.",
year = "2023",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences – National Institute of the Republic of Serbia, University of Belgrade",
title = "Photonica2023 : IX International School and Conference on Photonics : Book of Abstracts",
pages = "XV, 155",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11556"
}

Potočnik, J., Popović, M.,& Božanić, D. K.. (2023). Photonica2023 : IX International School and Conference on Photonics : Book of Abstracts. 
Belgrade : Vinča Institute of Nuclear Sciences – National Institute of the Republic of Serbia, University of Belgrade., XV, 155.
https://hdl.handle.net/21.15107/rcub_vinar_11556

Potočnik J, Popović M, Božanić DK. Photonica2023 : IX International School and Conference on Photonics : Book of Abstracts. 2023;:XV, 155.
https://hdl.handle.net/21.15107/rcub_vinar_11556 .

Potočnik, Jelena, Popović, Maja, Božanić, Dušan K., "Photonica2023 : IX International School and Conference on Photonics : Book of Abstracts" (2023):XV, 155,
https://hdl.handle.net/21.15107/rcub_vinar_11556 .

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  - 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  - Validžić, Ivana Lj.
AU  - Popović, Maja
AU  - Potočnik, Jelena
AU  - Graf, Christina
AU  - Joschko, Maximilian
AU  - Kuznetsova, Yulia A.
AU  - Zatsepin, Dmitry A.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10750
AB  - Amorphous, non-doped, and copper- and selenium-doped Sb2S3 nanoparticles were synthesized by a hot-injection method. Zinc-doped Sb2S3 nanoparticles were prepared for the first time using the same approach. Electron microscopy revealed that spherical nanoparticles of 1–4 nanometers aggregated into larger spherical clusters. Introducing dopants into the Sb2S3 structure neither influenced the samples’ spherical morphology nor their sizes. The presence of the dopants (Cu, Se, or Zn) was confirmed by energy dispersive X-ray (EDX) and, in the case of Zn, also by inductively coupled plasma-mass spectrometry (ICP-MS). The X-ray powder diffraction (XRPD) patterns of the non-doped and doped samples imply an amorphous structure. Crystalline Zn-doped Sb2S3 revealed defined peaks from only the Sb2S3 phase, indicating successful doping. Diffuse reflectance spectroscopy (DRS) revealed high optical bandgap energies (2.03–2.12 eV) compared to the values (1.6–1.7 eV) for large non-doped and doped particles obtained at 240 °C, which might be attributed to a quantum size effect. X-ray photoelectron spectroscopy (XPS) revealed a phase without any impurities for the undoped and characteristic peaks for copper, selenium, and zinc Auger for the doped samples. XPS valence band confirm for the Zn-doped particles a shift towards lower binding energy compared to the non-doped samples, indicating successful doping. Photoluminescence (PL) measurements show that embedding Zn into the Sb2S3 host lattice suppresses the wide luminescence band related to intrinsic vacancy defects. Narrow peaks at 1.7–2.4 eV were found to be associated with singlet excitons. The energy dependence of the light emission on the synthesized nanoparticles’ size suggests quantum confinement. © 2023, The Author(s), under exclusive licence to Springer Nature B.V.
T2  - Journal of Nanoparticle Research
T1  - Amorphous non-doped and Se-, Cu-, and Zn-doped Sb2S3 nanoparticles prepared by a hot-injection method: bandgap tuning and possible observation of the quantum size effect
VL  - 25
IS  - 3
SP  - 48
DO  - 10.1007/s11051-023-05695-5
ER  - 

@article{
author = "Validžić, Ivana Lj. and Popović, Maja and Potočnik, Jelena and Graf, Christina and Joschko, Maximilian and Kuznetsova, Yulia A. and Zatsepin, Dmitry A.",
year = "2023",
abstract = "Amorphous, non-doped, and copper- and selenium-doped Sb2S3 nanoparticles were synthesized by a hot-injection method. Zinc-doped Sb2S3 nanoparticles were prepared for the first time using the same approach. Electron microscopy revealed that spherical nanoparticles of 1–4 nanometers aggregated into larger spherical clusters. Introducing dopants into the Sb2S3 structure neither influenced the samples’ spherical morphology nor their sizes. The presence of the dopants (Cu, Se, or Zn) was confirmed by energy dispersive X-ray (EDX) and, in the case of Zn, also by inductively coupled plasma-mass spectrometry (ICP-MS). The X-ray powder diffraction (XRPD) patterns of the non-doped and doped samples imply an amorphous structure. Crystalline Zn-doped Sb2S3 revealed defined peaks from only the Sb2S3 phase, indicating successful doping. Diffuse reflectance spectroscopy (DRS) revealed high optical bandgap energies (2.03–2.12 eV) compared to the values (1.6–1.7 eV) for large non-doped and doped particles obtained at 240 °C, which might be attributed to a quantum size effect. X-ray photoelectron spectroscopy (XPS) revealed a phase without any impurities for the undoped and characteristic peaks for copper, selenium, and zinc Auger for the doped samples. XPS valence band confirm for the Zn-doped particles a shift towards lower binding energy compared to the non-doped samples, indicating successful doping. Photoluminescence (PL) measurements show that embedding Zn into the Sb2S3 host lattice suppresses the wide luminescence band related to intrinsic vacancy defects. Narrow peaks at 1.7–2.4 eV were found to be associated with singlet excitons. The energy dependence of the light emission on the synthesized nanoparticles’ size suggests quantum confinement. © 2023, The Author(s), under exclusive licence to Springer Nature B.V.",
journal = "Journal of Nanoparticle Research",
title = "Amorphous non-doped and Se-, Cu-, and Zn-doped Sb2S3 nanoparticles prepared by a hot-injection method: bandgap tuning and possible observation of the quantum size effect",
volume = "25",
number = "3",
pages = "48",
doi = "10.1007/s11051-023-05695-5"
}

Validžić, I. Lj., Popović, M., Potočnik, J., Graf, C., Joschko, M., Kuznetsova, Y. A.,& Zatsepin, D. A.. (2023). Amorphous non-doped and Se-, Cu-, and Zn-doped Sb2S3 nanoparticles prepared by a hot-injection method: bandgap tuning and possible observation of the quantum size effect. in Journal of Nanoparticle Research, 25(3), 48.
https://doi.org/10.1007/s11051-023-05695-5

Validžić IL, Popović M, Potočnik J, Graf C, Joschko M, Kuznetsova YA, Zatsepin DA. Amorphous non-doped and Se-, Cu-, and Zn-doped Sb2S3 nanoparticles prepared by a hot-injection method: bandgap tuning and possible observation of the quantum size effect. in Journal of Nanoparticle Research. 2023;25(3):48.
doi:10.1007/s11051-023-05695-5 .

Validžić, Ivana Lj., Popović, Maja, Potočnik, Jelena, Graf, Christina, Joschko, Maximilian, Kuznetsova, Yulia A., Zatsepin, Dmitry A., "Amorphous non-doped and Se-, Cu-, and Zn-doped Sb2S3 nanoparticles prepared by a hot-injection method: bandgap tuning and possible observation of the quantum size effect" in Journal of Nanoparticle Research, 25, no. 3 (2023):48,
https://doi.org/10.1007/s11051-023-05695-5 . .

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  - JOUR
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
AU  - Noga, Pavol
AU  - Vana, Dušan
AU  - Ronning, Carsten
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10106
AB  - Titanium-nitride (TiN) is known as a very promising plasmonic material, which offers many advantages compared to conventional metals commonly used in practical devices. Despite many improvements, TiN still suffers from high losses in the near-infrared (NIR) spectral region, making it less suitable for real-life applications. In this study, we have investigated the effects of pure silver implanted as well as silver/gold co-implanted TiN thin films on their optical properties, which we analyzed by spectroscopic ellipsometry. We demonstrate that the presence of silver and gold drastically changes both the real and imaginary part of the dielectric function. The implanted films exhibit optical losses several times lower compared to as-deposited TiN. The changes are in particular more pronounced for the samples with Au/Ag co-implantations, reaching nearly the same optical values as those of pure gold and being only slightly larger than that of silver. Thus, such an optical tuning of TiN opens new horizons and provide high potential for its implementation into plasmonic applications.
T2  - Optical Materials
T1  - Low optical losses in plasmonic TiN thin films implanted with silver and gold
VL  - 123
SP  - 111936
DO  - 10.1016/j.optmat.2021.111936
ER  - 

@article{
author = "Novaković, Mirjana M. and Popović, Maja and Noga, Pavol and Vana, Dušan and Ronning, Carsten",
year = "2022",
abstract = "Titanium-nitride (TiN) is known as a very promising plasmonic material, which offers many advantages compared to conventional metals commonly used in practical devices. Despite many improvements, TiN still suffers from high losses in the near-infrared (NIR) spectral region, making it less suitable for real-life applications. In this study, we have investigated the effects of pure silver implanted as well as silver/gold co-implanted TiN thin films on their optical properties, which we analyzed by spectroscopic ellipsometry. We demonstrate that the presence of silver and gold drastically changes both the real and imaginary part of the dielectric function. The implanted films exhibit optical losses several times lower compared to as-deposited TiN. The changes are in particular more pronounced for the samples with Au/Ag co-implantations, reaching nearly the same optical values as those of pure gold and being only slightly larger than that of silver. Thus, such an optical tuning of TiN opens new horizons and provide high potential for its implementation into plasmonic applications.",
journal = "Optical Materials",
title = "Low optical losses in plasmonic TiN thin films implanted with silver and gold",
volume = "123",
pages = "111936",
doi = "10.1016/j.optmat.2021.111936"
}

Novaković, M. M., Popović, M., Noga, P., Vana, D.,& Ronning, C.. (2022). Low optical losses in plasmonic TiN thin films implanted with silver and gold. in Optical Materials, 123, 111936.
https://doi.org/10.1016/j.optmat.2021.111936

Novaković MM, Popović M, Noga P, Vana D, Ronning C. Low optical losses in plasmonic TiN thin films implanted with silver and gold. in Optical Materials. 2022;123:111936.
doi:10.1016/j.optmat.2021.111936 .

Novaković, Mirjana M., Popović, Maja, Noga, Pavol, Vana, Dušan, Ronning, Carsten, "Low optical losses in plasmonic TiN thin films implanted with silver and gold" in Optical Materials, 123 (2022):111936,
https://doi.org/10.1016/j.optmat.2021.111936 . .

TY  - JOUR
AU  - Potočnik, Jelena
AU  - Božinović, Nevena
AU  - Novaković, Mirjana M.
AU  - Barudžija, Tanja
AU  - Nenadović, Miloš
AU  - Popović, Maja
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10299
AB  - In this study, we have investigated the effect of thickness on the structural and optical properties of copper (Cu) helical nanostructures. Thin films with thicknesses of 160 nm, 280 nm, 450 nm, and 780 nm were obtained by e-beam glancing angle deposition. The morphology and the microstructure were studied by field emission scanning electron microscopy, x-ray diffraction and transmission electron microscopy, while for the optical analysis measurements spectroscopic ellipsometry was used. The results show that the deposited structures are porous with nanometer-sized crystallites preferentially oriented along (111) planes, as well as that the diameter of the helices increases with thickness. Detailed analyses of optical properties have demonstrated that the dielectric function of Cu structures is greatly influenced by the films thicknesses. With increasing thickness from 160 nm to 780 nm, the surface plasmon resonance peak was shifted from 1.31 eV to 1.05 eV, which was correlated with the growth mechanism and the size of deposited nanostructures.
T2  - Nanotechnology
T1  - Optical properties of copper helical nanostructures: the effect of thickness on the SPR peak position
VL  - 33
IS  - 34
SP  - 345710
DO  - 10.1088/1361-6528/ac705c
ER  - 

@article{
author = "Potočnik, Jelena and Božinović, Nevena and Novaković, Mirjana M. and Barudžija, Tanja and Nenadović, Miloš and Popović, Maja",
year = "2022",
abstract = "In this study, we have investigated the effect of thickness on the structural and optical properties of copper (Cu) helical nanostructures. Thin films with thicknesses of 160 nm, 280 nm, 450 nm, and 780 nm were obtained by e-beam glancing angle deposition. The morphology and the microstructure were studied by field emission scanning electron microscopy, x-ray diffraction and transmission electron microscopy, while for the optical analysis measurements spectroscopic ellipsometry was used. The results show that the deposited structures are porous with nanometer-sized crystallites preferentially oriented along (111) planes, as well as that the diameter of the helices increases with thickness. Detailed analyses of optical properties have demonstrated that the dielectric function of Cu structures is greatly influenced by the films thicknesses. With increasing thickness from 160 nm to 780 nm, the surface plasmon resonance peak was shifted from 1.31 eV to 1.05 eV, which was correlated with the growth mechanism and the size of deposited nanostructures.",
journal = "Nanotechnology",
title = "Optical properties of copper helical nanostructures: the effect of thickness on the SPR peak position",
volume = "33",
number = "34",
pages = "345710",
doi = "10.1088/1361-6528/ac705c"
}

Potočnik, J., Božinović, N., Novaković, M. M., Barudžija, T., Nenadović, M.,& Popović, M.. (2022). Optical properties of copper helical nanostructures: the effect of thickness on the SPR peak position. in Nanotechnology, 33(34), 345710.
https://doi.org/10.1088/1361-6528/ac705c

Potočnik J, Božinović N, Novaković MM, Barudžija T, Nenadović M, Popović M. Optical properties of copper helical nanostructures: the effect of thickness on the SPR peak position. in Nanotechnology. 2022;33(34):345710.
doi:10.1088/1361-6528/ac705c .

Potočnik, Jelena, Božinović, Nevena, Novaković, Mirjana M., Barudžija, Tanja, Nenadović, Miloš, Popović, Maja, "Optical properties of copper helical nanostructures: the effect of thickness on the SPR peak position" in Nanotechnology, 33, no. 34 (2022):345710,
https://doi.org/10.1088/1361-6528/ac705c . .

TY  - JOUR
AU  - Potočnik, Jelena
AU  - Božinović, Nevena
AU  - Popović, Maja
AU  - Barudžija, Tanja
AU  - Nenadović, Miloš
AU  - Novaković, Mirjana M.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10366
AB  - Copper (Cu) thin films were deposited by using glancing angle deposition in the form of zigzag and square spiral nanostructures. Thin films were fabricated under different azimuthal rotations (φ = 180°, 90°, 45°, 22.5° and 11°), to the thickness of approximately 300 nm. Morphological, chemical and structural properties were investigated by field-emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy. For the optical characterization of the samples spectroscopic ellipsometry was used, while the electrical properties were analyzed by four-point probe method. It was found that as the azimuthal rotation decreases, deposited nanostructures become more porous with larger number of grown arms. Both, optical and electrical analyses revealed that the properties of the obtained thin films are significantly influenced by growth mechanism. By decreasing the φ parameter, the surface plasmon resonance peak was shifted from 1038.9 nm to 1676.6 nm, which can be correlated with the porosity of Cu structures. Besides, it was found that the optical and electrical properties of the thin films are also strongly dependent on the concentration of defects.
T2  - Journal of Alloys and Compounds
T1  - Fabrication of zigzag and square spiral Cu nanostructures: Influence of substrate rotation on the structural, optical and electrical properties
VL  - 922
SP  - 166211
DO  - 10.1016/j.jallcom.2022.166211
ER  - 

@article{
author = "Potočnik, Jelena and Božinović, Nevena and Popović, Maja and Barudžija, Tanja and Nenadović, Miloš and Novaković, Mirjana M.",
year = "2022",
abstract = "Copper (Cu) thin films were deposited by using glancing angle deposition in the form of zigzag and square spiral nanostructures. Thin films were fabricated under different azimuthal rotations (φ = 180°, 90°, 45°, 22.5° and 11°), to the thickness of approximately 300 nm. Morphological, chemical and structural properties were investigated by field-emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy. For the optical characterization of the samples spectroscopic ellipsometry was used, while the electrical properties were analyzed by four-point probe method. It was found that as the azimuthal rotation decreases, deposited nanostructures become more porous with larger number of grown arms. Both, optical and electrical analyses revealed that the properties of the obtained thin films are significantly influenced by growth mechanism. By decreasing the φ parameter, the surface plasmon resonance peak was shifted from 1038.9 nm to 1676.6 nm, which can be correlated with the porosity of Cu structures. Besides, it was found that the optical and electrical properties of the thin films are also strongly dependent on the concentration of defects.",
journal = "Journal of Alloys and Compounds",
title = "Fabrication of zigzag and square spiral Cu nanostructures: Influence of substrate rotation on the structural, optical and electrical properties",
volume = "922",
pages = "166211",
doi = "10.1016/j.jallcom.2022.166211"
}

Potočnik, J., Božinović, N., Popović, M., Barudžija, T., Nenadović, M.,& Novaković, M. M.. (2022). Fabrication of zigzag and square spiral Cu nanostructures: Influence of substrate rotation on the structural, optical and electrical properties. in Journal of Alloys and Compounds, 922, 166211.
https://doi.org/10.1016/j.jallcom.2022.166211

Potočnik J, Božinović N, Popović M, Barudžija T, Nenadović M, Novaković MM. Fabrication of zigzag and square spiral Cu nanostructures: Influence of substrate rotation on the structural, optical and electrical properties. in Journal of Alloys and Compounds. 2022;922:166211.
doi:10.1016/j.jallcom.2022.166211 .

Potočnik, Jelena, Božinović, Nevena, Popović, Maja, Barudžija, Tanja, Nenadović, Miloš, Novaković, Mirjana M., "Fabrication of zigzag and square spiral Cu nanostructures: Influence of substrate rotation on the structural, optical and electrical properties" in Journal of Alloys and Compounds, 922 (2022):166211,
https://doi.org/10.1016/j.jallcom.2022.166211 . .

TY  - JOUR
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10428
AB  - The paper reports the study on dielectric functions of TiN films implanted with Ag ions and after annealing at 400 °C and 700 °C, employing spectroscopic ellipsometry technique. By using Drude-Lorentz modelling we have analysed and discussed in detail the evolution of screened and unscreened plasma frequency as well as Drude parameter. In comparison to as deposited film the real part of dielectric constant for Ag-implanted layers exhibits less negative values with increasing ion fluence implying the films possess less metallicity, whereas after annealing TiN becomes more metallic. Simultaneously, after implantation, the imaginary part is more than an order of magnitude lower than for the as deposited TiN and several times lower than that of Au and Ag. The magnitude of imaginary contribution of Ag-implanted TiN films decreases further after subsequent heat treatment at both 400 °C and 700 °C annealing temperatures. Although the differences in stoichiometry and microstructural changes, such as crystallite size, concentration of grain boundaries and defect density were assumed to be the major reason for the variation in optical properties of TiN, spectroscopic ellipsometry data exhibited much stronger effects than expected and indicated some other mechanisms could also be responsible for such behaviour.
T2  - Optical Materials
T1  - Investigating the optical response of titanium-nitride thin films after silver ion implantation and post-thermal annealing
VL  - 133
SP  - 112955
DO  - 10.1016/j.optmat.2022.112955
ER  - 

@article{
author = "Novaković, Mirjana M. and Popović, Maja",
year = "2022",
abstract = "The paper reports the study on dielectric functions of TiN films implanted with Ag ions and after annealing at 400 °C and 700 °C, employing spectroscopic ellipsometry technique. By using Drude-Lorentz modelling we have analysed and discussed in detail the evolution of screened and unscreened plasma frequency as well as Drude parameter. In comparison to as deposited film the real part of dielectric constant for Ag-implanted layers exhibits less negative values with increasing ion fluence implying the films possess less metallicity, whereas after annealing TiN becomes more metallic. Simultaneously, after implantation, the imaginary part is more than an order of magnitude lower than for the as deposited TiN and several times lower than that of Au and Ag. The magnitude of imaginary contribution of Ag-implanted TiN films decreases further after subsequent heat treatment at both 400 °C and 700 °C annealing temperatures. Although the differences in stoichiometry and microstructural changes, such as crystallite size, concentration of grain boundaries and defect density were assumed to be the major reason for the variation in optical properties of TiN, spectroscopic ellipsometry data exhibited much stronger effects than expected and indicated some other mechanisms could also be responsible for such behaviour.",
journal = "Optical Materials",
title = "Investigating the optical response of titanium-nitride thin films after silver ion implantation and post-thermal annealing",
volume = "133",
pages = "112955",
doi = "10.1016/j.optmat.2022.112955"
}

Novaković, M. M.,& Popović, M.. (2022). Investigating the optical response of titanium-nitride thin films after silver ion implantation and post-thermal annealing. in Optical Materials, 133, 112955.
https://doi.org/10.1016/j.optmat.2022.112955

Novaković MM, Popović M. Investigating the optical response of titanium-nitride thin films after silver ion implantation and post-thermal annealing. in Optical Materials. 2022;133:112955.
doi:10.1016/j.optmat.2022.112955 .

Novaković, Mirjana M., Popović, Maja, "Investigating the optical response of titanium-nitride thin films after silver ion implantation and post-thermal annealing" in Optical Materials, 133 (2022):112955,
https://doi.org/10.1016/j.optmat.2022.112955 . .

TY  - JOUR
AU  - Pešić, Ivan
AU  - Petrović, Miloš
AU  - Vuksanović, Marija M.
AU  - Popović, Maja
AU  - Rabasović, Maja
AU  - Šević, Dragutin
AU  - Radojević, Vesna
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10668
AB  - Processing and characterization of PMMA-MXene composites were investigated. γ-Methacryloxypropyltrimethoxy (MEMO) silane was used to modify the surface of MXenes and improve the compatibility between MXenes and the polymer. The FTIR analysis revealed the formation of a chemical bond between MXene and MEMO silane, while the XPS analysis confirmed the presence of silicon in the functionalized MXene. PMMA composites with non-functionalized and functionalized MXene were prepared using a solution casting method. Tensile tests showed that, compared to neat PMMA, Young’s modulus increased in both composites by 22.1 and 27.6%, respectively. As a result of coupling between the PMMA matrix and the surface-modified MXenes, the tensile strength also increased by about 37%. In addition, optical spectroscopy showed higher absorption for the composite with surface-modified MXenes and short-lived fluorescence with emission intensity sensitive to the crumpling of functionalized MXene nanosheets.
T2  - Nanocomposites
T1  - Structural, optical and mechanical characterization of PMMA- MXene composites functionalized with MEMO silane
VL  - 8
IS  - 1
SP  - 215
EP  - 226
DO  - 10.1080/20550324.2023.2168844
ER  - 

@article{
author = "Pešić, Ivan and Petrović, Miloš and Vuksanović, Marija M. and Popović, Maja and Rabasović, Maja and Šević, Dragutin and Radojević, Vesna",
year = "2022",
abstract = "Processing and characterization of PMMA-MXene composites were investigated. γ-Methacryloxypropyltrimethoxy (MEMO) silane was used to modify the surface of MXenes and improve the compatibility between MXenes and the polymer. The FTIR analysis revealed the formation of a chemical bond between MXene and MEMO silane, while the XPS analysis confirmed the presence of silicon in the functionalized MXene. PMMA composites with non-functionalized and functionalized MXene were prepared using a solution casting method. Tensile tests showed that, compared to neat PMMA, Young’s modulus increased in both composites by 22.1 and 27.6%, respectively. As a result of coupling between the PMMA matrix and the surface-modified MXenes, the tensile strength also increased by about 37%. In addition, optical spectroscopy showed higher absorption for the composite with surface-modified MXenes and short-lived fluorescence with emission intensity sensitive to the crumpling of functionalized MXene nanosheets.",
journal = "Nanocomposites",
title = "Structural, optical and mechanical characterization of PMMA- MXene composites functionalized with MEMO silane",
volume = "8",
number = "1",
pages = "215-226",
doi = "10.1080/20550324.2023.2168844"
}

Pešić, I., Petrović, M., Vuksanović, M. M., Popović, M., Rabasović, M., Šević, D.,& Radojević, V.. (2022). Structural, optical and mechanical characterization of PMMA- MXene composites functionalized with MEMO silane. in Nanocomposites, 8(1), 215-226.
https://doi.org/10.1080/20550324.2023.2168844

Pešić I, Petrović M, Vuksanović MM, Popović M, Rabasović M, Šević D, Radojević V. Structural, optical and mechanical characterization of PMMA- MXene composites functionalized with MEMO silane. in Nanocomposites. 2022;8(1):215-226.
doi:10.1080/20550324.2023.2168844 .

Pešić, Ivan, Petrović, Miloš, Vuksanović, Marija M., Popović, Maja, Rabasović, Maja, Šević, Dragutin, Radojević, Vesna, "Structural, optical and mechanical characterization of PMMA- MXene composites functionalized with MEMO silane" in Nanocomposites, 8, no. 1 (2022):215-226,
https://doi.org/10.1080/20550324.2023.2168844 . .

TY  - JOUR
AU  - Potočnik, Jelena
AU  - Popović, Maja
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10570
AB  - In this work, the influence of different deposition angles on the structural, chemical and magnetic properties of nickel (Ni) thin films was investigated. Nickel samples were deposited by glancing angle deposition technique at two different angles, 65o and 85o. Characterization of the thin films was carried out by scanning electron microscopy, X-ray photoelectron spectroscopy and magneto-optical Kerr effect microscopy. Structural analysis was found that the changes in the deposition angle have a great influence on the porosity of the film as well as on the amount of the present nickel oxide (NiO) in the samples. On the other hand, we have also found that different deposition angle changes the magnetic response of nickel film. The coercivity of the samples deposited at the angle of 85o is significantly higher compared to the samples deposited at lower angle which could be correlated with the higher porosity and the amount of NiO in the thin films.
T2  - Science of Sintering
T1  - The Effect of Thickness and Deposition Angle on Structural, Chemical and Magnetic Properties of Nickel Slanted Columns
VL  - 54
IS  - 4
SP  - 449
EP  - 456
DO  - 10.2298/SOS2204449P
ER  - 

@article{
author = "Potočnik, Jelena and Popović, Maja",
year = "2022",
abstract = "In this work, the influence of different deposition angles on the structural, chemical and magnetic properties of nickel (Ni) thin films was investigated. Nickel samples were deposited by glancing angle deposition technique at two different angles, 65o and 85o. Characterization of the thin films was carried out by scanning electron microscopy, X-ray photoelectron spectroscopy and magneto-optical Kerr effect microscopy. Structural analysis was found that the changes in the deposition angle have a great influence on the porosity of the film as well as on the amount of the present nickel oxide (NiO) in the samples. On the other hand, we have also found that different deposition angle changes the magnetic response of nickel film. The coercivity of the samples deposited at the angle of 85o is significantly higher compared to the samples deposited at lower angle which could be correlated with the higher porosity and the amount of NiO in the thin films.",
journal = "Science of Sintering",
title = "The Effect of Thickness and Deposition Angle on Structural, Chemical and Magnetic Properties of Nickel Slanted Columns",
volume = "54",
number = "4",
pages = "449-456",
doi = "10.2298/SOS2204449P"
}

Potočnik, J.,& Popović, M.. (2022). The Effect of Thickness and Deposition Angle on Structural, Chemical and Magnetic Properties of Nickel Slanted Columns. in Science of Sintering, 54(4), 449-456.
https://doi.org/10.2298/SOS2204449P

Potočnik J, Popović M. The Effect of Thickness and Deposition Angle on Structural, Chemical and Magnetic Properties of Nickel Slanted Columns. in Science of Sintering. 2022;54(4):449-456.
doi:10.2298/SOS2204449P .

Potočnik, Jelena, Popović, Maja, "The Effect of Thickness and Deposition Angle on Structural, Chemical and Magnetic Properties of Nickel Slanted Columns" in Science of Sintering, 54, no. 4 (2022):449-456,
https://doi.org/10.2298/SOS2204449P . .

TY  - CONF
AU  - Stamenković, Tijana
AU  - Popović, Maja
AU  - Pjević, Dejan
AU  - Čebela, Maria
AU  - Lojpur, Vesna
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11508
AB  - In this study, we present surface examination and investigation of the photocatalytic activity of a newly synthesized down-conversion luminescent nanomaterial SrGd2O4 doped with Dy3+ ions. Samples were prepared via glycineassisted combustion method, were formed gel was firstly burned at 500 °C for 1.5 h and then calcined at 1000 °C for 2.5 h. To see the crystallinity and phase purity, Xray diffraction (XRD) measurements were performed and showed that doped sample crystallizes as a single phase with the orthorhombic lattice of SrGd2O4. Luminescent characterization indicated presence of all appropriate emission peaks related to Dy3+ dopant ions. X-ray photoelectron spectroscopy (XPS) was used to investigate surface composition and survey spectra confirmed presence of expected elements (Sr, Gd, O and Dy). Photocatalytic properties of SrGd2O4:Dy were explored in the photocatalytic degradation of organic dye methyl orange (MO) under simulated solar light irradiation. UV/Vis spectrometer was used to measure a decrease in MO concentration in water solutions during the experiment. Aliquots of the working solutions were taken at the exact time intervals, and the results indicate successful dye decomposition rate after 4 h.
PB  - University of Belgrade : Institute for Multidisciplinary Research
C3  - 6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade
T1  - Surface characterization and photocatalytic activity of newly synthesized Dy doped SrGd2O4 phosphorus
SP  - 61
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11508
ER  - 

@conference{
author = "Stamenković, Tijana and Popović, Maja and Pjević, Dejan and Čebela, Maria and Lojpur, Vesna",
year = "2022",
abstract = "In this study, we present surface examination and investigation of the photocatalytic activity of a newly synthesized down-conversion luminescent nanomaterial SrGd2O4 doped with Dy3+ ions. Samples were prepared via glycineassisted combustion method, were formed gel was firstly burned at 500 °C for 1.5 h and then calcined at 1000 °C for 2.5 h. To see the crystallinity and phase purity, Xray diffraction (XRD) measurements were performed and showed that doped sample crystallizes as a single phase with the orthorhombic lattice of SrGd2O4. Luminescent characterization indicated presence of all appropriate emission peaks related to Dy3+ dopant ions. X-ray photoelectron spectroscopy (XPS) was used to investigate surface composition and survey spectra confirmed presence of expected elements (Sr, Gd, O and Dy). Photocatalytic properties of SrGd2O4:Dy were explored in the photocatalytic degradation of organic dye methyl orange (MO) under simulated solar light irradiation. UV/Vis spectrometer was used to measure a decrease in MO concentration in water solutions during the experiment. Aliquots of the working solutions were taken at the exact time intervals, and the results indicate successful dye decomposition rate after 4 h.",
publisher = "University of Belgrade : Institute for Multidisciplinary Research",
journal = "6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade",
title = "Surface characterization and photocatalytic activity of newly synthesized Dy doped SrGd2O4 phosphorus",
pages = "61",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11508"
}

Stamenković, T., Popović, M., Pjević, D., Čebela, M.,& Lojpur, V.. (2022). Surface characterization and photocatalytic activity of newly synthesized Dy doped SrGd2O4 phosphorus. in 6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade
University of Belgrade : Institute for Multidisciplinary Research., 61.
https://hdl.handle.net/21.15107/rcub_vinar_11508

Stamenković T, Popović M, Pjević D, Čebela M, Lojpur V. Surface characterization and photocatalytic activity of newly synthesized Dy doped SrGd2O4 phosphorus. in 6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade. 2022;:61.
https://hdl.handle.net/21.15107/rcub_vinar_11508 .

Stamenković, Tijana, Popović, Maja, Pjević, Dejan, Čebela, Maria, Lojpur, Vesna, "Surface characterization and photocatalytic activity of newly synthesized Dy doped SrGd2O4 phosphorus" in 6CSCS : 6th Serbian Ceramic Society Conference : programme and the book of abstracts; June 28-29; Belgrade (2022):61,
https://hdl.handle.net/21.15107/rcub_vinar_11508 .

TY  - JOUR
AU  - Potočnik, Jelena
AU  - Popović, Maja
AU  - Mitrić, Miodrag
AU  - Rakočević, Zlatko Lj.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9753
AB  - In this work we deposited nickel thin films by Glancing Angle Deposition at two different angles (65 degrees and 85 degrees) onto glass substrates. The structure of the films, thicknesses between 50 and 200 nm, was studied by scanning electron microscopy, atomic force microscopy and X-ray diffraction, while the chemical properties were analyzed using X-ray photoelectron spectroscopy. According to the obtained results it can be seen that the deposition angle has influence on porosity, crystallinity and surface roughness. Optical properties were investigated by spectroscopic ellipsometry and electrical properties were measured by four point probe. Spectroscopic ellipsometry revealed that the refractive index and extinction coefficient varied with thickness and deposition angle, which can be correlated with changes in microstructure and porosity of Ni films. The observed variations in resistivity could be attributed to the changes in the width of the columns, as well as to the amount of oxide present in the samples.
T2  - Optical Materials
T1  - Control of porosity and optical properties of slanted columnar Ni thin films
VL  - 111
SP  - 110649
DO  - 10.1016/j.optmat.2020.110649
ER  - 

@article{
author = "Potočnik, Jelena and Popović, Maja and Mitrić, Miodrag and Rakočević, Zlatko Lj.",
year = "2021",
abstract = "In this work we deposited nickel thin films by Glancing Angle Deposition at two different angles (65 degrees and 85 degrees) onto glass substrates. The structure of the films, thicknesses between 50 and 200 nm, was studied by scanning electron microscopy, atomic force microscopy and X-ray diffraction, while the chemical properties were analyzed using X-ray photoelectron spectroscopy. According to the obtained results it can be seen that the deposition angle has influence on porosity, crystallinity and surface roughness. Optical properties were investigated by spectroscopic ellipsometry and electrical properties were measured by four point probe. Spectroscopic ellipsometry revealed that the refractive index and extinction coefficient varied with thickness and deposition angle, which can be correlated with changes in microstructure and porosity of Ni films. The observed variations in resistivity could be attributed to the changes in the width of the columns, as well as to the amount of oxide present in the samples.",
journal = "Optical Materials",
title = "Control of porosity and optical properties of slanted columnar Ni thin films",
volume = "111",
pages = "110649",
doi = "10.1016/j.optmat.2020.110649"
}

Potočnik, J., Popović, M., Mitrić, M.,& Rakočević, Z. Lj.. (2021). Control of porosity and optical properties of slanted columnar Ni thin films. in Optical Materials, 111, 110649.
https://doi.org/10.1016/j.optmat.2020.110649

Potočnik J, Popović M, Mitrić M, Rakočević ZL. Control of porosity and optical properties of slanted columnar Ni thin films. in Optical Materials. 2021;111:110649.
doi:10.1016/j.optmat.2020.110649 .

Potočnik, Jelena, Popović, Maja, Mitrić, Miodrag, Rakočević, Zlatko Lj., "Control of porosity and optical properties of slanted columnar Ni thin films" in Optical Materials, 111 (2021):110649,
https://doi.org/10.1016/j.optmat.2020.110649 . .

TY  - JOUR
AU  - Rakočević, Lazar
AU  - Štrbac, Svetlana
AU  - Potočnik, Jelena
AU  - Popović, Maja
AU  - Jugović, Dragana
AU  - Stojković-Simatović, Ivana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10203
AB  - Cathodic material for sodium-ion rechargeable batteries based on NaxMnO2 were synthesized by glycine nitrate method and subsequent annealing at high temperatures. Different crystal structures with different morphologies were obtained depending on the annealing temperature: hexagonal layeredα-Na0.7MnO2.05 nanoplates were obtained at 850 ◦C, while 3-D tunnel structured Na0⋅4MnO2 and Na0⋅44MnO2, both with rod-like morphology, were obtained at 800 ◦C and 900 ◦C, respectively. The investigations of the electrochemical behavior of obtained cathodic materials in aqueous NaNO3 solution have shown that Na0⋅44MnO2 obtained at 900 ◦C has shown the best battery performance. Its initial discharge capacities are 123.5 mA h/g, 113.2 mA h/g, and 102.0 mA h/g at the high current densities of 1000, 2000 and 5000 mA/g, respectively.
T2  - Ceramics International
T1  - The NaxMnO2 materials prepared by a glycine-nitrate method as advanced cathode materials for aqueous sodium-ion rechargeable batteries
VL  - 47
IS  - 4
SP  - 4595
EP  - 4603
DO  - 10.1016/j.ceramint.2020.10.025
UR  - https://hdl.handle.net/21.15107/rcub_dais_11229
ER  - 

@article{
author = "Rakočević, Lazar and Štrbac, Svetlana and Potočnik, Jelena and Popović, Maja and Jugović, Dragana and Stojković-Simatović, Ivana",
year = "2021",
abstract = "Cathodic material for sodium-ion rechargeable batteries based on NaxMnO2 were synthesized by glycine nitrate method and subsequent annealing at high temperatures. Different crystal structures with different morphologies were obtained depending on the annealing temperature: hexagonal layeredα-Na0.7MnO2.05 nanoplates were obtained at 850 ◦C, while 3-D tunnel structured Na0⋅4MnO2 and Na0⋅44MnO2, both with rod-like morphology, were obtained at 800 ◦C and 900 ◦C, respectively. The investigations of the electrochemical behavior of obtained cathodic materials in aqueous NaNO3 solution have shown that Na0⋅44MnO2 obtained at 900 ◦C has shown the best battery performance. Its initial discharge capacities are 123.5 mA h/g, 113.2 mA h/g, and 102.0 mA h/g at the high current densities of 1000, 2000 and 5000 mA/g, respectively.",
journal = "Ceramics International",
title = "The NaxMnO2 materials prepared by a glycine-nitrate method as advanced cathode materials for aqueous sodium-ion rechargeable batteries",
volume = "47",
number = "4",
pages = "4595-4603",
doi = "10.1016/j.ceramint.2020.10.025",
url = "https://hdl.handle.net/21.15107/rcub_dais_11229"
}

Rakočević, L., Štrbac, S., Potočnik, J., Popović, M., Jugović, D.,& Stojković-Simatović, I.. (2021). The NaxMnO2 materials prepared by a glycine-nitrate method as advanced cathode materials for aqueous sodium-ion rechargeable batteries. in Ceramics International, 47(4), 4595-4603.
https://doi.org/10.1016/j.ceramint.2020.10.025
https://hdl.handle.net/21.15107/rcub_dais_11229

Rakočević L, Štrbac S, Potočnik J, Popović M, Jugović D, Stojković-Simatović I. The NaxMnO2 materials prepared by a glycine-nitrate method as advanced cathode materials for aqueous sodium-ion rechargeable batteries. in Ceramics International. 2021;47(4):4595-4603.
doi:10.1016/j.ceramint.2020.10.025
https://hdl.handle.net/21.15107/rcub_dais_11229 .

Rakočević, Lazar, Štrbac, Svetlana, Potočnik, Jelena, Popović, Maja, Jugović, Dragana, Stojković-Simatović, Ivana, "The NaxMnO2 materials prepared by a glycine-nitrate method as advanced cathode materials for aqueous sodium-ion rechargeable batteries" in Ceramics International, 47, no. 4 (2021):4595-4603,
https://doi.org/10.1016/j.ceramint.2020.10.025 .,
https://hdl.handle.net/21.15107/rcub_dais_11229 .

TY  - JOUR
AU  - Potočnik, Jelena
AU  - Popović, Maja
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9994
AB  - In this study, nickel (Ni) thin films were deposited at two different angles (65o and 85o) using Glancing Angle Deposition technique, to the thicknesses of 60 – 290 nm. Structural analysis of the deposited films was performed by scanning electron microscopy and X-ray diffraction, while spectroscopic ellipsometry was used for the investigation of optical properties. Electrical resitivity of the samples was determined by four-point probe method. Structural analysis showed that the Ni films grow in a shape of zigzag nanocolumns, where the deposition angle strongly affects their porosity. As the thickness of the films increase they absorb light strongly and become less dense. Besides, samples deposited at the angle of 85o exhibit higher values of electrical resistivity as compared to the samples deposited at the angle of 65o, which can be correlated with high porosity and the growth mechanism of the deposited nanostructures.
T2  - Science of Sintering
T1  - Optical properties of zigzag nickel nanostructures obtained at different deposition angles
VL  - 53
IS  - 3
SP  - 347
EP  - 353
DO  - 10.2298/SOS2103347P
ER  - 

@article{
author = "Potočnik, Jelena and Popović, Maja",
year = "2021",
abstract = "In this study, nickel (Ni) thin films were deposited at two different angles (65o and 85o) using Glancing Angle Deposition technique, to the thicknesses of 60 – 290 nm. Structural analysis of the deposited films was performed by scanning electron microscopy and X-ray diffraction, while spectroscopic ellipsometry was used for the investigation of optical properties. Electrical resitivity of the samples was determined by four-point probe method. Structural analysis showed that the Ni films grow in a shape of zigzag nanocolumns, where the deposition angle strongly affects their porosity. As the thickness of the films increase they absorb light strongly and become less dense. Besides, samples deposited at the angle of 85o exhibit higher values of electrical resistivity as compared to the samples deposited at the angle of 65o, which can be correlated with high porosity and the growth mechanism of the deposited nanostructures.",
journal = "Science of Sintering",
title = "Optical properties of zigzag nickel nanostructures obtained at different deposition angles",
volume = "53",
number = "3",
pages = "347-353",
doi = "10.2298/SOS2103347P"
}

Potočnik, J.,& Popović, M.. (2021). Optical properties of zigzag nickel nanostructures obtained at different deposition angles. in Science of Sintering, 53(3), 347-353.
https://doi.org/10.2298/SOS2103347P

Potočnik J, Popović M. Optical properties of zigzag nickel nanostructures obtained at different deposition angles. in Science of Sintering. 2021;53(3):347-353.
doi:10.2298/SOS2103347P .

Potočnik, Jelena, Popović, Maja, "Optical properties of zigzag nickel nanostructures obtained at different deposition angles" in Science of Sintering, 53, no. 3 (2021):347-353,
https://doi.org/10.2298/SOS2103347P . .

TY  - JOUR
AU  - Rakočević, Lazar
AU  - Štrbac, Svetlana
AU  - Potočnik, Jelena
AU  - Popović, Maja
AU  - Jugović, Dragana
AU  - Stojković-Simatović, Ivana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10202
AB  - Cathodic material for sodium-ion rechargeable batteries based on NaxMnO2 were synthesized by glycine nitrate method and subsequent annealing at high temperatures. Different crystal structures with different morphologies were obtained depending on the annealing temperature: hexagonal layeredα-Na0.7MnO2.05 nanoplates were obtained at 850 ◦C, while 3-D tunnel structured Na0⋅4MnO2 and Na0⋅44MnO2, both with rod-like morphology, were obtained at 800 ◦C and 900 ◦C, respectively. The investigations of the electrochemical behavior of obtained cathodic materials in aqueous NaNO3 solution have shown that Na0⋅44MnO2 obtained at 900 ◦C has shown the best battery performance. Its initial discharge capacities are 123.5 mA h/g, 113.2 mA h/g, and 102.0 mA h/g at the high current densities of 1000, 2000 and 5000 mA/g, respectively.
T2  - Ceramics International
T1  - The NaxMnO2 materials prepared by a glycine-nitrate method as advanced cathode materials for aqueous sodium-ion rechargeable batteries
VL  - 47
IS  - 4
SP  - 4595
EP  - 4603
DO  - 10.1016/j.ceramint.2020.10.025
UR  - https://hdl.handle.net/21.15107/rcub_dais_11229
ER  - 

@article{
author = "Rakočević, Lazar and Štrbac, Svetlana and Potočnik, Jelena and Popović, Maja and Jugović, Dragana and Stojković-Simatović, Ivana",
year = "2021",
abstract = "Cathodic material for sodium-ion rechargeable batteries based on NaxMnO2 were synthesized by glycine nitrate method and subsequent annealing at high temperatures. Different crystal structures with different morphologies were obtained depending on the annealing temperature: hexagonal layeredα-Na0.7MnO2.05 nanoplates were obtained at 850 ◦C, while 3-D tunnel structured Na0⋅4MnO2 and Na0⋅44MnO2, both with rod-like morphology, were obtained at 800 ◦C and 900 ◦C, respectively. The investigations of the electrochemical behavior of obtained cathodic materials in aqueous NaNO3 solution have shown that Na0⋅44MnO2 obtained at 900 ◦C has shown the best battery performance. Its initial discharge capacities are 123.5 mA h/g, 113.2 mA h/g, and 102.0 mA h/g at the high current densities of 1000, 2000 and 5000 mA/g, respectively.",
journal = "Ceramics International",
title = "The NaxMnO2 materials prepared by a glycine-nitrate method as advanced cathode materials for aqueous sodium-ion rechargeable batteries",
volume = "47",
number = "4",
pages = "4595-4603",
doi = "10.1016/j.ceramint.2020.10.025",
url = "https://hdl.handle.net/21.15107/rcub_dais_11229"
}

Rakočević, L., Štrbac, S., Potočnik, J., Popović, M., Jugović, D.,& Stojković-Simatović, I.. (2021). The NaxMnO2 materials prepared by a glycine-nitrate method as advanced cathode materials for aqueous sodium-ion rechargeable batteries. in Ceramics International, 47(4), 4595-4603.
https://doi.org/10.1016/j.ceramint.2020.10.025
https://hdl.handle.net/21.15107/rcub_dais_11229

Rakočević L, Štrbac S, Potočnik J, Popović M, Jugović D, Stojković-Simatović I. The NaxMnO2 materials prepared by a glycine-nitrate method as advanced cathode materials for aqueous sodium-ion rechargeable batteries. in Ceramics International. 2021;47(4):4595-4603.
doi:10.1016/j.ceramint.2020.10.025
https://hdl.handle.net/21.15107/rcub_dais_11229 .

Rakočević, Lazar, Štrbac, Svetlana, Potočnik, Jelena, Popović, Maja, Jugović, Dragana, Stojković-Simatović, Ivana, "The NaxMnO2 materials prepared by a glycine-nitrate method as advanced cathode materials for aqueous sodium-ion rechargeable batteries" in Ceramics International, 47, no. 4 (2021):4595-4603,
https://doi.org/10.1016/j.ceramint.2020.10.025 .,
https://hdl.handle.net/21.15107/rcub_dais_11229 .

TY  - JOUR
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
AU  - Noga, Pavol
AU  - Vaňa, Dušan
AU  - Rakočević, Zlatko Lj.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8929
AB  - Au-Ag alloy nanoparticles were formed into amorphous silicon by sequential ion implantation of Au and Ag. Monocrystalline Si was amorphized at the initial moment of implantation with 1 × 1016 ions/cm2 gold ions, and then different silver fluences were applied in the range of 1 × 1016–1 × 1017 ions/cm2. After implantations the samples were investigated by means of Rutherford backscattering spectrometry and transmission electron microscopy. The nanoparticles were found to be formed at surface and sub-surface regions of the Si substrate, at depths corresponding to the maximum distribution of Au and Ag ions. The particles are crystalline in nature with sizes from 2 nm to 30 nm in diameter, increasing with silver ion fluence. Although the lattice constants of gold and silver are too close to be distinguished by measuring the characteristic interplanar spacings, imaging in scanning transmission mode confirms the formation of Au-Ag bimetallic nanoparticles, presenting a solid-solution alloy of gold and silver.
T2  - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
T1  - Formation of Au-Ag alloy nanoparticles in amorphous silicon using sequential ion implantation
VL  - 471
SP  - 33
EP  - 41
DO  - 10.1016/j.nimb.2020.03.021
ER  - 

@article{
author = "Novaković, Mirjana M. and Popović, Maja and Noga, Pavol and Vaňa, Dušan and Rakočević, Zlatko Lj.",
year = "2020",
abstract = "Au-Ag alloy nanoparticles were formed into amorphous silicon by sequential ion implantation of Au and Ag. Monocrystalline Si was amorphized at the initial moment of implantation with 1 × 1016 ions/cm2 gold ions, and then different silver fluences were applied in the range of 1 × 1016–1 × 1017 ions/cm2. After implantations the samples were investigated by means of Rutherford backscattering spectrometry and transmission electron microscopy. The nanoparticles were found to be formed at surface and sub-surface regions of the Si substrate, at depths corresponding to the maximum distribution of Au and Ag ions. The particles are crystalline in nature with sizes from 2 nm to 30 nm in diameter, increasing with silver ion fluence. Although the lattice constants of gold and silver are too close to be distinguished by measuring the characteristic interplanar spacings, imaging in scanning transmission mode confirms the formation of Au-Ag bimetallic nanoparticles, presenting a solid-solution alloy of gold and silver.",
journal = "Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms",
title = "Formation of Au-Ag alloy nanoparticles in amorphous silicon using sequential ion implantation",
volume = "471",
pages = "33-41",
doi = "10.1016/j.nimb.2020.03.021"
}

Novaković, M. M., Popović, M., Noga, P., Vaňa, D.,& Rakočević, Z. Lj.. (2020). Formation of Au-Ag alloy nanoparticles in amorphous silicon using sequential ion implantation. in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 471, 33-41.
https://doi.org/10.1016/j.nimb.2020.03.021

Novaković MM, Popović M, Noga P, Vaňa D, Rakočević ZL. Formation of Au-Ag alloy nanoparticles in amorphous silicon using sequential ion implantation. in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 2020;471:33-41.
doi:10.1016/j.nimb.2020.03.021 .

Novaković, Mirjana M., Popović, Maja, Noga, Pavol, Vaňa, Dušan, Rakočević, Zlatko Lj., "Formation of Au-Ag alloy nanoparticles in amorphous silicon using sequential ion implantation" in Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 471 (2020):33-41,
https://doi.org/10.1016/j.nimb.2020.03.021 . .

TY  - JOUR
AU  - Popović, Maja
AU  - Novaković, Mirjana M.
AU  - Noga, Pavol
AU  - Vaňa, Dušan
AU  - Rakočević, Zlatko Lj.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9589
AB  - Formation of Au-Ag alloy nanoparticles in TiN thin films is demonstrated through sequential implantation of Au and Ag ions. The irradiations were done with 200 keV Au ions at fluence of 1.0 × 1016 ions/cm2 and 150 keV Ag ions to the fluences in the range of 0.7–1.3 × 1017 ions/cm2. It was found that irradiations introduce around 1.5 at.% of gold and up to ~20 at.% of silver species causing also the significant sputtering of the surface. TiN surface besides the topographic undergoes chemical changes. The presence of silver and gold is confirmed by photoemission spectroscopy showing that the implanted ions did not form any kind of compound with the surrounding matrix. Electron microscopy evidenced the formation of crystalline and quasi-spherical particles with dimensions below 10 nm. Elemental analysis revealed that the obtained nanoparticles present Au-Ag alloys, with two elements mixed over the whole volume of the particles in different Au:Ag ratios. © 2020 Elsevier B.V.
T2  - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
T1  - Ion beam synthesis of Au-Ag alloy nanoparticles in TiN thin films
VL  - 475
SP  - 20
EP  - 27
DO  - 10.1016/j.nimb.2020.04.032
ER  - 

@article{
author = "Popović, Maja and Novaković, Mirjana M. and Noga, Pavol and Vaňa, Dušan and Rakočević, Zlatko Lj.",
year = "2020",
abstract = "Formation of Au-Ag alloy nanoparticles in TiN thin films is demonstrated through sequential implantation of Au and Ag ions. The irradiations were done with 200 keV Au ions at fluence of 1.0 × 1016 ions/cm2 and 150 keV Ag ions to the fluences in the range of 0.7–1.3 × 1017 ions/cm2. It was found that irradiations introduce around 1.5 at.% of gold and up to ~20 at.% of silver species causing also the significant sputtering of the surface. TiN surface besides the topographic undergoes chemical changes. The presence of silver and gold is confirmed by photoemission spectroscopy showing that the implanted ions did not form any kind of compound with the surrounding matrix. Electron microscopy evidenced the formation of crystalline and quasi-spherical particles with dimensions below 10 nm. Elemental analysis revealed that the obtained nanoparticles present Au-Ag alloys, with two elements mixed over the whole volume of the particles in different Au:Ag ratios. © 2020 Elsevier B.V.",
journal = "Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms",
title = "Ion beam synthesis of Au-Ag alloy nanoparticles in TiN thin films",
volume = "475",
pages = "20-27",
doi = "10.1016/j.nimb.2020.04.032"
}

Popović, M., Novaković, M. M., Noga, P., Vaňa, D.,& Rakočević, Z. Lj.. (2020). Ion beam synthesis of Au-Ag alloy nanoparticles in TiN thin films. in Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 475, 20-27.
https://doi.org/10.1016/j.nimb.2020.04.032

Popović M, Novaković MM, Noga P, Vaňa D, Rakočević ZL. Ion beam synthesis of Au-Ag alloy nanoparticles in TiN thin films. in Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. 2020;475:20-27.
doi:10.1016/j.nimb.2020.04.032 .

Popović, Maja, Novaković, Mirjana M., Noga, Pavol, Vaňa, Dušan, Rakočević, Zlatko Lj., "Ion beam synthesis of Au-Ag alloy nanoparticles in TiN thin films" in Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 475 (2020):20-27,
https://doi.org/10.1016/j.nimb.2020.04.032 . .

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  - Petrović, Suzana
AU  - Peruško, Davor
AU  - Mimidis, Alexandros
AU  - Kavatzikidou, Paraskevi
AU  - Kovač, Janez
AU  - Ranella, Anthi
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
AU  - Stratakis, Emmanuel
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9785
AB  - Ultrafast laser processing with the formation of periodic surface nanostructures on the 15×(Ti/Zr)/Si multilayers is studied in order to the improve cell response. A novel nanocomposite structure in the form of 15x(Ti/Zr)/Si multilayer thin films, with satisfying mechanical properties and moderate biocompatibility, was deposited by ion sputtering on an Si substrate. The multilayer 15×(Ti/Zr)/Si thin films were modified by femtosecond laser pulses in air to induce the following modifications: (i) mixing of components inside of the multilayer structures, (ii) the formation of an ultrathin oxide layer at the surfaces, and (iii) surface nano-texturing with the creation of laser-induced periodic surface structure (LIPSS). The focus of this study was an examination of the novel Ti/Zr multilayer thin films in order to create a surface texture with suitable composition and structure for cell integration. Using the SEM and confocal microscopies of the laser-modified Ti/Zr surfaces with seeded cell culture (NIH 3T3 fibroblasts), it was found that cell adhesion and growth depend on the surface composition and morphological patterns. These results indicated a good proliferation of cells after two and four days with some tendency of the cell orientation along the LIPSSs. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
T2  - Nanomaterials
T1  - Response of NIH 3T3 fibroblast cells on laser-induced periodic surface structures on a 15×(Ti/Zr)/Si multilayer system
VL  - 10
IS  - 12
SP  - 1
EP  - 14
DO  - 10.3390/nano10122531
ER  - 

@article{
author = "Petrović, Suzana and Peruško, Davor and Mimidis, Alexandros and Kavatzikidou, Paraskevi and Kovač, Janez and Ranella, Anthi and Novaković, Mirjana M. and Popović, Maja and Stratakis, Emmanuel",
year = "2020",
abstract = "Ultrafast laser processing with the formation of periodic surface nanostructures on the 15×(Ti/Zr)/Si multilayers is studied in order to the improve cell response. A novel nanocomposite structure in the form of 15x(Ti/Zr)/Si multilayer thin films, with satisfying mechanical properties and moderate biocompatibility, was deposited by ion sputtering on an Si substrate. The multilayer 15×(Ti/Zr)/Si thin films were modified by femtosecond laser pulses in air to induce the following modifications: (i) mixing of components inside of the multilayer structures, (ii) the formation of an ultrathin oxide layer at the surfaces, and (iii) surface nano-texturing with the creation of laser-induced periodic surface structure (LIPSS). The focus of this study was an examination of the novel Ti/Zr multilayer thin films in order to create a surface texture with suitable composition and structure for cell integration. Using the SEM and confocal microscopies of the laser-modified Ti/Zr surfaces with seeded cell culture (NIH 3T3 fibroblasts), it was found that cell adhesion and growth depend on the surface composition and morphological patterns. These results indicated a good proliferation of cells after two and four days with some tendency of the cell orientation along the LIPSSs. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.",
journal = "Nanomaterials",
title = "Response of NIH 3T3 fibroblast cells on laser-induced periodic surface structures on a 15×(Ti/Zr)/Si multilayer system",
volume = "10",
number = "12",
pages = "1-14",
doi = "10.3390/nano10122531"
}

Petrović, S., Peruško, D., Mimidis, A., Kavatzikidou, P., Kovač, J., Ranella, A., Novaković, M. M., Popović, M.,& Stratakis, E.. (2020). Response of NIH 3T3 fibroblast cells on laser-induced periodic surface structures on a 15×(Ti/Zr)/Si multilayer system. in Nanomaterials, 10(12), 1-14.
https://doi.org/10.3390/nano10122531

Petrović S, Peruško D, Mimidis A, Kavatzikidou P, Kovač J, Ranella A, Novaković MM, Popović M, Stratakis E. Response of NIH 3T3 fibroblast cells on laser-induced periodic surface structures on a 15×(Ti/Zr)/Si multilayer system. in Nanomaterials. 2020;10(12):1-14.
doi:10.3390/nano10122531 .

Petrović, Suzana, Peruško, Davor, Mimidis, Alexandros, Kavatzikidou, Paraskevi, Kovač, Janez, Ranella, Anthi, Novaković, Mirjana M., Popović, Maja, Stratakis, Emmanuel, "Response of NIH 3T3 fibroblast cells on laser-induced periodic surface structures on a 15×(Ti/Zr)/Si multilayer system" in Nanomaterials, 10, no. 12 (2020):1-14,
https://doi.org/10.3390/nano10122531 . .

TY  - CONF
AU  - Pjević, Dejan
AU  - Peruško, Davor
AU  - Savić, Tatjana
AU  - Novaković, Mirjana
AU  - Popović, Maja
AU  - Potočnik, Jelena
AU  - Petrović, Suzana
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11901
AB  - INTRODUCTION: Titanium dioxide (TiO2) thin films showed as promising materials for photocatalytic degradation of pollutants in water under irradiation of UV-light. It is favorable material for photocatalytic processes because of its non-toxicity, high photosensitivity, large band gap and stability. One of the way to increase efficiency of TiO2 thin films is by doping and coating with metals. Metal-doped TiO2 can reduce electron-hole recombination and increase hydroxyl radical concentration on the surface of TiO2, resulting in increase in the photocatalytic activity1. In studies of J.M.Jung at al.1 with Au-buffered TiO2 thin films and V. S. Mohite et al.2 with doped TiO2 thin films showed that this systems have enhanced photocatalytic activity in comparison to pure TiO2 thin films. Also recent study3 showed that Au doped TiO2 thin films are great candidates beside photocatalysis for enhancing visible light water splitting. EXPERIMENTAL STUDY TiO2 and TiO2:Au thin films were obtained by DC magnetron sputtering of Ti target with Ar ions in O2 atmosphere. In the case of doped TiO2 thin films with Au, three different systems were deposited for comparison (fig.1): Buffering Au layer into the TiO2 layer (b), subsurface buffering of Au with island formation of Au on the surface and etching the surface of TiO2 layer by HF and applying Au nanoparticles on the surface. Annealing of the samples was performed in air and N2 atmospheres on 600 °C for better crystallinity and release of defects. For structural analyses XRD, XPS, TEM and SEM methods were used, while for optical characterization UV/Vis method was used. The photo-degradation rate was measured using Rhodamine B which simulated pollutant. Fig. 1: Experimental setup. RESULTS AND DISCUSSION Structural analysis has shown that as deposited films have amorphous-like structures, while post-deposition thermal annealing in air for 3 hours inducted significantly better crystallinity in thin films with anatase phase dominating. SEM analysis showed the presence of 10 nm Au buffered layer in crystalline structure of TiO2 and also on the surface. Optical measurements showed shift of the absorbance edge in UV/Vis spectra toward visible light wavelengths. Presence of metal dopant in the structure probably has induced some new energy sites in the region of TiO2 energy gap. Analysis of the binding energy in the corresponding XPS spectra showed that deposited films have good stoichiometry of TiO2. At binding energies of 530 eV where O1s line is present there is broadening toward higher energies and can be attributed to surface hydroxyl group. Presence of this group on the surface of the films is favorable for photo-degradation processes. CONCLUSION Obtained TiO2 thin films after deposition were amorphous-like structured, and after annealing on 600 °C anatase phase dominates in the structure. All Au doped TiO2 thin films showed better photo-degradation rates then pure TiO2. Presence of the gold clusters on the surface of the thin film showed of significant importance. Future work will be concentrated on understanding mechanisms of different Au doping sites in TiO2 crystal structure on its photocatalytic activity.
C3  - ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts
T1  - Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11901
ER  - 

@conference{
author = "Pjević, Dejan and Peruško, Davor and Savić, Tatjana and Novaković, Mirjana and Popović, Maja and Potočnik, Jelena and Petrović, Suzana",
year = "2019",
abstract = "INTRODUCTION: Titanium dioxide (TiO2) thin films showed as promising materials for photocatalytic degradation of pollutants in water under irradiation of UV-light. It is favorable material for photocatalytic processes because of its non-toxicity, high photosensitivity, large band gap and stability. One of the way to increase efficiency of TiO2 thin films is by doping and coating with metals. Metal-doped TiO2 can reduce electron-hole recombination and increase hydroxyl radical concentration on the surface of TiO2, resulting in increase in the photocatalytic activity1. In studies of J.M.Jung at al.1 with Au-buffered TiO2 thin films and V. S. Mohite et al.2 with doped TiO2 thin films showed that this systems have enhanced photocatalytic activity in comparison to pure TiO2 thin films. Also recent study3 showed that Au doped TiO2 thin films are great candidates beside photocatalysis for enhancing visible light water splitting. EXPERIMENTAL STUDY TiO2 and TiO2:Au thin films were obtained by DC magnetron sputtering of Ti target with Ar ions in O2 atmosphere. In the case of doped TiO2 thin films with Au, three different systems were deposited for comparison (fig.1): Buffering Au layer into the TiO2 layer (b), subsurface buffering of Au with island formation of Au on the surface and etching the surface of TiO2 layer by HF and applying Au nanoparticles on the surface. Annealing of the samples was performed in air and N2 atmospheres on 600 °C for better crystallinity and release of defects. For structural analyses XRD, XPS, TEM and SEM methods were used, while for optical characterization UV/Vis method was used. The photo-degradation rate was measured using Rhodamine B which simulated pollutant. Fig. 1: Experimental setup. RESULTS AND DISCUSSION Structural analysis has shown that as deposited films have amorphous-like structures, while post-deposition thermal annealing in air for 3 hours inducted significantly better crystallinity in thin films with anatase phase dominating. SEM analysis showed the presence of 10 nm Au buffered layer in crystalline structure of TiO2 and also on the surface. Optical measurements showed shift of the absorbance edge in UV/Vis spectra toward visible light wavelengths. Presence of metal dopant in the structure probably has induced some new energy sites in the region of TiO2 energy gap. Analysis of the binding energy in the corresponding XPS spectra showed that deposited films have good stoichiometry of TiO2. At binding energies of 530 eV where O1s line is present there is broadening toward higher energies and can be attributed to surface hydroxyl group. Presence of this group on the surface of the films is favorable for photo-degradation processes. CONCLUSION Obtained TiO2 thin films after deposition were amorphous-like structured, and after annealing on 600 °C anatase phase dominates in the structure. All Au doped TiO2 thin films showed better photo-degradation rates then pure TiO2. Presence of the gold clusters on the surface of the thin film showed of significant importance. Future work will be concentrated on understanding mechanisms of different Au doping sites in TiO2 crystal structure on its photocatalytic activity.",
journal = "ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts",
title = "Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11901"
}

Pjević, D., Peruško, D., Savić, T., Novaković, M., Popović, M., Potočnik, J.,& Petrović, S.. (2019). Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering. in ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts.
https://hdl.handle.net/21.15107/rcub_vinar_11901

Pjević D, Peruško D, Savić T, Novaković M, Popović M, Potočnik J, Petrović S. Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering. in ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts. 2019;.
https://hdl.handle.net/21.15107/rcub_vinar_11901 .

Pjević, Dejan, Peruško, Davor, Savić, Tatjana, Novaković, Mirjana, Popović, Maja, Potočnik, Jelena, Petrović, Suzana, "Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering" in ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts (2019),
https://hdl.handle.net/21.15107/rcub_vinar_11901 .

TY  - JOUR
AU  - Popović, Maja
AU  - Novaković, Mirjana M.
AU  - Noga, Pavol
AU  - Vaňa, Dušan
AU  - Rakočević, Zlatko Lj.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8123
AB  - In this study, we demonstrated the formation of a new type of AuAg@Ag nanostructure in titanium nitride (TiN) thin films using sequential implantation of Au and Ag ions. The TiN films deposited by DC reactive sputtering were sequentially implanted with 200 keV gold ions at fluences of 0.5 × 10 16 and 1 × 10 16 ions/cm 2 and 150 keV silver ions at fluences of 1 × 10 16 , 2 × 10 16 , 3 × 10 16 , and 4 × 10 16 ions/cm 2 . Formation of spherical-like particles with dimensions below 10 nm, homogeneously distributed along the ion track of implanted ions is verified by high resolution transmission electron microscopy. Specific nanostructure containing Au–Ag alloy in the center of the particle and only silver on the periphery was found in the TiN sample sequentially implanted with 1.0 × 10 16 ions/cm 2 of Au and 4 × 10 16 ions/cm 2 of Ag using high angle annular dark field scanning electron microscopy together with elemental mapping analysis. On the other hand, for the sample implanted with 0.5 × 10 16 ions/cm 2 of Au and 4 × 10 16 ions/cm 2 of Ag only formation of Au–Ag alloy was observed. A mechanism for the formation of a new type core/shell nanostructure in ion implanted TiN thin films is proposed. By varying the implantation fluence of the gold and silver ions properly, the optimized experimental parameters for creation of a specific AuAg@Ag core/shell nanoparticles were achieved. © 2019 Elsevier B.V.
T2  - Applied Surface Science
T1  - Synthesis of AuAg@Ag core/shell bimetallic nanoparticles in titanium nitride thin films by sequential ion implantation
VL  - 481
SP  - 1418
EP  - 1424
DO  - 10.1016/j.apsusc.2019.03.243
ER  - 

@article{
author = "Popović, Maja and Novaković, Mirjana M. and Noga, Pavol and Vaňa, Dušan and Rakočević, Zlatko Lj.",
year = "2019",
abstract = "In this study, we demonstrated the formation of a new type of AuAg@Ag nanostructure in titanium nitride (TiN) thin films using sequential implantation of Au and Ag ions. The TiN films deposited by DC reactive sputtering were sequentially implanted with 200 keV gold ions at fluences of 0.5 × 10 16 and 1 × 10 16 ions/cm 2 and 150 keV silver ions at fluences of 1 × 10 16 , 2 × 10 16 , 3 × 10 16 , and 4 × 10 16 ions/cm 2 . Formation of spherical-like particles with dimensions below 10 nm, homogeneously distributed along the ion track of implanted ions is verified by high resolution transmission electron microscopy. Specific nanostructure containing Au–Ag alloy in the center of the particle and only silver on the periphery was found in the TiN sample sequentially implanted with 1.0 × 10 16 ions/cm 2 of Au and 4 × 10 16 ions/cm 2 of Ag using high angle annular dark field scanning electron microscopy together with elemental mapping analysis. On the other hand, for the sample implanted with 0.5 × 10 16 ions/cm 2 of Au and 4 × 10 16 ions/cm 2 of Ag only formation of Au–Ag alloy was observed. A mechanism for the formation of a new type core/shell nanostructure in ion implanted TiN thin films is proposed. By varying the implantation fluence of the gold and silver ions properly, the optimized experimental parameters for creation of a specific AuAg@Ag core/shell nanoparticles were achieved. © 2019 Elsevier B.V.",
journal = "Applied Surface Science",
title = "Synthesis of AuAg@Ag core/shell bimetallic nanoparticles in titanium nitride thin films by sequential ion implantation",
volume = "481",
pages = "1418-1424",
doi = "10.1016/j.apsusc.2019.03.243"
}

Popović, M., Novaković, M. M., Noga, P., Vaňa, D.,& Rakočević, Z. Lj.. (2019). Synthesis of AuAg@Ag core/shell bimetallic nanoparticles in titanium nitride thin films by sequential ion implantation. in Applied Surface Science, 481, 1418-1424.
https://doi.org/10.1016/j.apsusc.2019.03.243

Popović M, Novaković MM, Noga P, Vaňa D, Rakočević ZL. Synthesis of AuAg@Ag core/shell bimetallic nanoparticles in titanium nitride thin films by sequential ion implantation. in Applied Surface Science. 2019;481:1418-1424.
doi:10.1016/j.apsusc.2019.03.243 .

Popović, Maja, Novaković, Mirjana M., Noga, Pavol, Vaňa, Dušan, Rakočević, Zlatko Lj., "Synthesis of AuAg@Ag core/shell bimetallic nanoparticles in titanium nitride thin films by sequential ion implantation" in Applied Surface Science, 481 (2019):1418-1424,
https://doi.org/10.1016/j.apsusc.2019.03.243 . .