TY  - JOUR
AU  - Mravik, Željko
AU  - Bajuk-Bogdanović, Danica V.
AU  - Mraković, Ana Đ.
AU  - Vukosavljević, Ljubiša
AU  - Trajić, Ivan
AU  - Kovač, Janez
AU  - Peruško, Davor
AU  - Gavrilov, Nemanja
AU  - Jovanović, Zoran M.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9150
AB  - In recent years polyoxometalates (POMs) have attracted significant research interest due to versatile properties. These properties are determined by the size, structure and elemental composition of POMs and hence play an important role in their application. In the present study, the ion beam irradiation (10 keV C+ ions, 5 × 1014–2.5 × 1015 ions/cm2) has been utilized for modification of physicochemical properties of 120 nm-thick layer of 12-tungstophosphoric acid (WPA). Scanning electron microscopy analysis of irradiated films showed change of morphology i.e. an increase of WPA grain size with irradiation and coalescence of grains at the highest fluence. This was accompanied by structural changes. Attenuated total reflectance Fourier transform infrared analysis revealed that vibration bands of Keggin anion became less pronounced as fluence increased, while Raman spectra appeared as strongly modified. The effect of irradiation with 1.25 × 1015 ions/cm2 on the structure of WPA was similar to the effect of thermal treatment at 600 °C. Irradiation of WPA led to decrease of the band gap (from 4.07 to 3.92 eV), which was correlated to transformation Keggin anions into a network of WO6 octahedra and PO4 tetrahedra. This is in line with increased number of W=Od bonds observed by UV–Visible diffuse reflectance spectroscopy. Beside transformation to bronzes a reduction of WPA was observed by X-ray Photoelectron Spectroscopy (shift to lower binding energy) and Raman methods, whereas the Raman spectra of irradiated samples were similar to heteropoly blue. The electrochemical properties of irradiated WPA were also assessed. Cyclic voltammetry measurements showed that at up to 1.25 × 1015 ions/cm2 lithiation capacity of WPA increases and activity for hydrogen evolution reaction (HER) improves. The highest fluence caused interconnection of WO6 octahedra, closing of lithiation pathways and decrease in the number of active sites for HER. Our results provide a novel insight into the effects of ion beam irradiation on WPA and demonstrate high potential for tuning of physicochemical properties of POMs that are relevant in wide range of applications. © 2021 Elsevier Ltd
T2  - Radiation Physics and Chemistry
T1  - Structural and electrochemical properties of carbon ion beam irradiated 12-tungstophosphoric acid
VL  - 183
SP  - 109422
DO  - 10.1016/j.radphyschem.2021.109422
ER  - 

@article{
author = "Mravik, Željko and Bajuk-Bogdanović, Danica V. and Mraković, Ana Đ. and Vukosavljević, Ljubiša and Trajić, Ivan and Kovač, Janez and Peruško, Davor and Gavrilov, Nemanja and Jovanović, Zoran M.",
year = "2021",
abstract = "In recent years polyoxometalates (POMs) have attracted significant research interest due to versatile properties. These properties are determined by the size, structure and elemental composition of POMs and hence play an important role in their application. In the present study, the ion beam irradiation (10 keV C+ ions, 5 × 1014–2.5 × 1015 ions/cm2) has been utilized for modification of physicochemical properties of 120 nm-thick layer of 12-tungstophosphoric acid (WPA). Scanning electron microscopy analysis of irradiated films showed change of morphology i.e. an increase of WPA grain size with irradiation and coalescence of grains at the highest fluence. This was accompanied by structural changes. Attenuated total reflectance Fourier transform infrared analysis revealed that vibration bands of Keggin anion became less pronounced as fluence increased, while Raman spectra appeared as strongly modified. The effect of irradiation with 1.25 × 1015 ions/cm2 on the structure of WPA was similar to the effect of thermal treatment at 600 °C. Irradiation of WPA led to decrease of the band gap (from 4.07 to 3.92 eV), which was correlated to transformation Keggin anions into a network of WO6 octahedra and PO4 tetrahedra. This is in line with increased number of W=Od bonds observed by UV–Visible diffuse reflectance spectroscopy. Beside transformation to bronzes a reduction of WPA was observed by X-ray Photoelectron Spectroscopy (shift to lower binding energy) and Raman methods, whereas the Raman spectra of irradiated samples were similar to heteropoly blue. The electrochemical properties of irradiated WPA were also assessed. Cyclic voltammetry measurements showed that at up to 1.25 × 1015 ions/cm2 lithiation capacity of WPA increases and activity for hydrogen evolution reaction (HER) improves. The highest fluence caused interconnection of WO6 octahedra, closing of lithiation pathways and decrease in the number of active sites for HER. Our results provide a novel insight into the effects of ion beam irradiation on WPA and demonstrate high potential for tuning of physicochemical properties of POMs that are relevant in wide range of applications. © 2021 Elsevier Ltd",
journal = "Radiation Physics and Chemistry",
title = "Structural and electrochemical properties of carbon ion beam irradiated 12-tungstophosphoric acid",
volume = "183",
pages = "109422",
doi = "10.1016/j.radphyschem.2021.109422"
}

Mravik, Ž., Bajuk-Bogdanović, D. V., Mraković, A. Đ., Vukosavljević, L., Trajić, I., Kovač, J., Peruško, D., Gavrilov, N.,& Jovanović, Z. M.. (2021). Structural and electrochemical properties of carbon ion beam irradiated 12-tungstophosphoric acid. in Radiation Physics and Chemistry, 183, 109422.
https://doi.org/10.1016/j.radphyschem.2021.109422

Mravik Ž, Bajuk-Bogdanović DV, Mraković AĐ, Vukosavljević L, Trajić I, Kovač J, Peruško D, Gavrilov N, Jovanović ZM. Structural and electrochemical properties of carbon ion beam irradiated 12-tungstophosphoric acid. in Radiation Physics and Chemistry. 2021;183:109422.
doi:10.1016/j.radphyschem.2021.109422 .

Mravik, Željko, Bajuk-Bogdanović, Danica V., Mraković, Ana Đ., Vukosavljević, Ljubiša, Trajić, Ivan, Kovač, Janez, Peruško, Davor, Gavrilov, Nemanja, Jovanović, Zoran M., "Structural and electrochemical properties of carbon ion beam irradiated 12-tungstophosphoric acid" in Radiation Physics and Chemistry, 183 (2021):109422,
https://doi.org/10.1016/j.radphyschem.2021.109422 . .

TY  - JOUR
AU  - Petrović, Suzana
AU  - Peruško, Davor
AU  - Skoulas, Evangelos
AU  - Kovač, Janez
AU  - Mitrić, Miodrag
AU  - Potočnik, Jelena
AU  - Rakočević, Zlatko Lj.
AU  - Stratakis, Emmanuel
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8816
AB  - The formation of an ordered surface texture with micro and nanometer features on Ti/Zr multilayers is studied for better understanding and improvement of cell integration. Nanocomposite in form 30×(Ti/Zr)/Si thin films was deposited by ion sputtering on Si substrate for biocompatibility investigation. Surface texturing by femtosecond laser processing made it possible to form the laser-induced periodic surface structure (LIPSS) in each laser-written line. At fluence slightly above the ablation threshold, beside the formation of low spatial frequency-LIPSS (LSFL) oriented perpendicular to the direction of the laser polarization, the laser-induced surface oxidation was achieved on the irradiated area. Intermixing between the Ti and Zr layers with the formation of alloy in the sub-surface region was attained during the laser processing. The surface of the Ti/Zr multilayer system with changed composition and topography was used to observe the effect of topography on the survival, adhesion and proliferation of the murine mesenchymal stem cells (MSCs). Confocal and SEM microscopy images showed that cell adhesion and their growth improve on these modified surfaces, with tendency of the cell orientation along of LIPSS in laser-written lines. © 2019 by the authors.
T2  - Coatings
T1  - Laser-assisted surface texturing of Ti/Zr multilayers for mesenchymal stem cell response
VL  - 9
IS  - 12
SP  - 854
DO  - 10.3390/coatings9120854
ER  - 

@article{
author = "Petrović, Suzana and Peruško, Davor and Skoulas, Evangelos and Kovač, Janez and Mitrić, Miodrag and Potočnik, Jelena and Rakočević, Zlatko Lj. and Stratakis, Emmanuel",
year = "2019",
abstract = "The formation of an ordered surface texture with micro and nanometer features on Ti/Zr multilayers is studied for better understanding and improvement of cell integration. Nanocomposite in form 30×(Ti/Zr)/Si thin films was deposited by ion sputtering on Si substrate for biocompatibility investigation. Surface texturing by femtosecond laser processing made it possible to form the laser-induced periodic surface structure (LIPSS) in each laser-written line. At fluence slightly above the ablation threshold, beside the formation of low spatial frequency-LIPSS (LSFL) oriented perpendicular to the direction of the laser polarization, the laser-induced surface oxidation was achieved on the irradiated area. Intermixing between the Ti and Zr layers with the formation of alloy in the sub-surface region was attained during the laser processing. The surface of the Ti/Zr multilayer system with changed composition and topography was used to observe the effect of topography on the survival, adhesion and proliferation of the murine mesenchymal stem cells (MSCs). Confocal and SEM microscopy images showed that cell adhesion and their growth improve on these modified surfaces, with tendency of the cell orientation along of LIPSS in laser-written lines. © 2019 by the authors.",
journal = "Coatings",
title = "Laser-assisted surface texturing of Ti/Zr multilayers for mesenchymal stem cell response",
volume = "9",
number = "12",
pages = "854",
doi = "10.3390/coatings9120854"
}

Petrović, S., Peruško, D., Skoulas, E., Kovač, J., Mitrić, M., Potočnik, J., Rakočević, Z. Lj.,& Stratakis, E.. (2019). Laser-assisted surface texturing of Ti/Zr multilayers for mesenchymal stem cell response. in Coatings, 9(12), 854.
https://doi.org/10.3390/coatings9120854

Petrović S, Peruško D, Skoulas E, Kovač J, Mitrić M, Potočnik J, Rakočević ZL, Stratakis E. Laser-assisted surface texturing of Ti/Zr multilayers for mesenchymal stem cell response. in Coatings. 2019;9(12):854.
doi:10.3390/coatings9120854 .

Petrović, Suzana, Peruško, Davor, Skoulas, Evangelos, Kovač, Janez, Mitrić, Miodrag, Potočnik, Jelena, Rakočević, Zlatko Lj., Stratakis, Emmanuel, "Laser-assisted surface texturing of Ti/Zr multilayers for mesenchymal stem cell response" in Coatings, 9, no. 12 (2019):854,
https://doi.org/10.3390/coatings9120854 . .

TY  - CONF
AU  - Grce, Ana
AU  - Pjević, Dejan
AU  - Milosavljević, Momir
AU  - Grieseler, Rolf
AU  - Schaaf, Peter
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12689
AB  - Titanium-dioxide nanostructures and thin films are interesting for application in environmental protection, for water and air purification from toxic compounds, and photocatalytic degradation of water, where separation of H2  is important for the development of new energy sources. Furthermore, they are interesting for fabrication of solar cells, various sensor applications, transparent conducting oxides (TCO), etc [1-3]. Stoichiometric TiO2 phase has a wide optoelectronic band gap of ~3.2 eV, which makes it a dielectric at lower temperatures and a semiconductor at higher temperatures. It has a high absorption coefficient in the range of UV radiation, but low in the visible light region, and this makes significant constrains for its usage as a photocatalyst. For reducing energy gap, better absorption in visible light region and more efficient application it is necessary to add doping material species, which can be metal or non-metal ions.When used as a photocatalyst in form of a powder, TiO2 nanoparticles are embedded in photosensitizing dyes which absorb visible light, or they are partly covered with nanoparticles of some transition metal to enhance injection of charge carriers. Recent developments involve the use of physical vapor deposition (vacuum evaporation or ion sputtering) to synthesize TiO2  thin film structures, and ion implantation for their doping. The advantage of using physical vapor deposition is that the Ti:O ratio can be varied, and the films can be deposited on any supporting or large area substrates. On the other hand, ion implantation is a proven technique for introducing dopant atomic species into the crystal lattice of semiconductor materials. In these experiments TiO2  thin films were synthesized by physical vapor deposition (PVD) method, using three different procedures: (i) reactive d.c. ion sputtering of pure Ti target, using Ar ions and introducing O2  in the deposition chamber; (ii) r.f. sputtering of TiO2  target, using Ar + O2  gas mixture; and (iii) reactive e-beam evaporation of pure Ti in the presence of introduced O2 . In case of reactive d.c. ion sputtering additional experiments involved a controlled introduction of nitrogen in the interaction chamber, which yielded doping of the deposited TiO2  thin films, in reducing their band gap and enhancing absorption of visible light. The films were deposited to a thickness of a few hundred nm on silicon wafers and glass slide substrates. Structural and compositional characterization of samples included X-ray diffraction analysis (XRD), transmission electron microscopy (TEM, HRTEM), Rutherford backscattering spectrometry (RBS), and X-ray photoelectron spectroscopy (XPS). Optical characterizations were done by measuringthe transmission and diffuse reflection UV/VIS spectra. Photocatalytic activity was measured by determining the photodegradation rate of organic solutions Structural characterization revealed that as-deposited samples grow in form of a mixture of very fine nanocrystalline grains of rutile and anatase TiO2  phases and TiO. Hence, in order to homogenize the TiO2  stoichiometry andinduce the growth of larger grains it was necessary to anneal the samples in air, at temperatures of 400 and 600 o C [4]. This procedure was performed on all samples after deposition. Bright-field cross-sectional images taken from two different TiO2  films deposited on Si wafers are shown in Fig. 1. Sharp contrast regions within the films indicate their polycrystalline structure. The results of investigations showed that it is possible to tailor the structure and properties of the obtained TiO2  thin films by adjusting the processing parameters.
PB  - Belgrade : Serbian Chemical Society
C3  - ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts
T1  - Nanostructured titanium-dioxide thin films for environmental applications
SP  - 205
EP  - 206
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12689
ER  - 

@conference{
author = "Grce, Ana and Pjević, Dejan and Milosavljević, Momir and Grieseler, Rolf and Schaaf, Peter",
year = "2018",
abstract = "Titanium-dioxide nanostructures and thin films are interesting for application in environmental protection, for water and air purification from toxic compounds, and photocatalytic degradation of water, where separation of H2  is important for the development of new energy sources. Furthermore, they are interesting for fabrication of solar cells, various sensor applications, transparent conducting oxides (TCO), etc [1-3]. Stoichiometric TiO2 phase has a wide optoelectronic band gap of ~3.2 eV, which makes it a dielectric at lower temperatures and a semiconductor at higher temperatures. It has a high absorption coefficient in the range of UV radiation, but low in the visible light region, and this makes significant constrains for its usage as a photocatalyst. For reducing energy gap, better absorption in visible light region and more efficient application it is necessary to add doping material species, which can be metal or non-metal ions.When used as a photocatalyst in form of a powder, TiO2 nanoparticles are embedded in photosensitizing dyes which absorb visible light, or they are partly covered with nanoparticles of some transition metal to enhance injection of charge carriers. Recent developments involve the use of physical vapor deposition (vacuum evaporation or ion sputtering) to synthesize TiO2  thin film structures, and ion implantation for their doping. The advantage of using physical vapor deposition is that the Ti:O ratio can be varied, and the films can be deposited on any supporting or large area substrates. On the other hand, ion implantation is a proven technique for introducing dopant atomic species into the crystal lattice of semiconductor materials. In these experiments TiO2  thin films were synthesized by physical vapor deposition (PVD) method, using three different procedures: (i) reactive d.c. ion sputtering of pure Ti target, using Ar ions and introducing O2  in the deposition chamber; (ii) r.f. sputtering of TiO2  target, using Ar + O2  gas mixture; and (iii) reactive e-beam evaporation of pure Ti in the presence of introduced O2 . In case of reactive d.c. ion sputtering additional experiments involved a controlled introduction of nitrogen in the interaction chamber, which yielded doping of the deposited TiO2  thin films, in reducing their band gap and enhancing absorption of visible light. The films were deposited to a thickness of a few hundred nm on silicon wafers and glass slide substrates. Structural and compositional characterization of samples included X-ray diffraction analysis (XRD), transmission electron microscopy (TEM, HRTEM), Rutherford backscattering spectrometry (RBS), and X-ray photoelectron spectroscopy (XPS). Optical characterizations were done by measuringthe transmission and diffuse reflection UV/VIS spectra. Photocatalytic activity was measured by determining the photodegradation rate of organic solutions Structural characterization revealed that as-deposited samples grow in form of a mixture of very fine nanocrystalline grains of rutile and anatase TiO2  phases and TiO. Hence, in order to homogenize the TiO2  stoichiometry andinduce the growth of larger grains it was necessary to anneal the samples in air, at temperatures of 400 and 600 o C [4]. This procedure was performed on all samples after deposition. Bright-field cross-sectional images taken from two different TiO2  films deposited on Si wafers are shown in Fig. 1. Sharp contrast regions within the films indicate their polycrystalline structure. The results of investigations showed that it is possible to tailor the structure and properties of the obtained TiO2  thin films by adjusting the processing parameters.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts",
title = "Nanostructured titanium-dioxide thin films for environmental applications",
pages = "205-206",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12689"
}

Grce, A., Pjević, D., Milosavljević, M., Grieseler, R.,& Schaaf, P.. (2018). Nanostructured titanium-dioxide thin films for environmental applications. in ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts
Belgrade : Serbian Chemical Society., 205-206.
https://hdl.handle.net/21.15107/rcub_vinar_12689

Grce A, Pjević D, Milosavljević M, Grieseler R, Schaaf P. Nanostructured titanium-dioxide thin films for environmental applications. in ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts. 2018;:205-206.
https://hdl.handle.net/21.15107/rcub_vinar_12689 .

Grce, Ana, Pjević, Dejan, Milosavljević, Momir, Grieseler, Rolf, Schaaf, Peter, "Nanostructured titanium-dioxide thin films for environmental applications" in ENVIROCHEM 2018 : 8th Symposium Chemistry and Environmental Protection : program and the book of abstracts (2018):205-206,
https://hdl.handle.net/21.15107/rcub_vinar_12689 .

TY  - JOUR
AU  - Obradović, Marko O.
AU  - Kovač, Janez
AU  - Petrović, Suzana
AU  - Lazović, Vladimir M.
AU  - Salatić, Branislav
AU  - Ciganović, Jovan
AU  - Pjević, Dejan J.
AU  - Milosavljević, Momir
AU  - Peruško, Davor
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7721
AB  - The possibility of interlayer mixing in a Ti/Ta multilayer system, induced by laser irradiation, was the main purpose of these experiments. Ti/Ta multilayer system, consisting of ten alternating Ti and Ta thin films and covered by slightly thicker Ti layer, was deposited on Si (100) wafers to a total thickness of 205 nm. Laser irradiation was performed in air by picoseconds Nd:YAG laser pulses in defocused regime with fluences of 0.057 and 0.11 J cm−2. Laser beam was scanned over the 5 × 5 mm surface area with different steps along y-axes. Structural and compositional characterisation was done by auger electron spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, and scanning electron microscopy. Laser processing at lower fluence caused only oxidation of the top Ti layer, despite of the number of applied laser pulses. Interlayer mixing was not observed. Application of laser pulses at fluence of 0.11 J cm−2caused partial and/or complete ablation of deposited layers. In partially ablated regions considerable mixing between Ti and Ta films was registered.
T2  - Optical and Quantum Electronics
T1  - Laser induced mixing in multilayered Ti/Ta thin film structures
VL  - 50
IS  - 6
SP  - 257
DO  - 10.1007/s11082-018-1525-x
ER  - 

@article{
author = "Obradović, Marko O. and Kovač, Janez and Petrović, Suzana and Lazović, Vladimir M. and Salatić, Branislav and Ciganović, Jovan and Pjević, Dejan J. and Milosavljević, Momir and Peruško, Davor",
year = "2018",
abstract = "The possibility of interlayer mixing in a Ti/Ta multilayer system, induced by laser irradiation, was the main purpose of these experiments. Ti/Ta multilayer system, consisting of ten alternating Ti and Ta thin films and covered by slightly thicker Ti layer, was deposited on Si (100) wafers to a total thickness of 205 nm. Laser irradiation was performed in air by picoseconds Nd:YAG laser pulses in defocused regime with fluences of 0.057 and 0.11 J cm−2. Laser beam was scanned over the 5 × 5 mm surface area with different steps along y-axes. Structural and compositional characterisation was done by auger electron spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, and scanning electron microscopy. Laser processing at lower fluence caused only oxidation of the top Ti layer, despite of the number of applied laser pulses. Interlayer mixing was not observed. Application of laser pulses at fluence of 0.11 J cm−2caused partial and/or complete ablation of deposited layers. In partially ablated regions considerable mixing between Ti and Ta films was registered.",
journal = "Optical and Quantum Electronics",
title = "Laser induced mixing in multilayered Ti/Ta thin film structures",
volume = "50",
number = "6",
pages = "257",
doi = "10.1007/s11082-018-1525-x"
}

Obradović, M. O., Kovač, J., Petrović, S., Lazović, V. M., Salatić, B., Ciganović, J., Pjević, D. J., Milosavljević, M.,& Peruško, D.. (2018). Laser induced mixing in multilayered Ti/Ta thin film structures. in Optical and Quantum Electronics, 50(6), 257.
https://doi.org/10.1007/s11082-018-1525-x

Obradović MO, Kovač J, Petrović S, Lazović VM, Salatić B, Ciganović J, Pjević DJ, Milosavljević M, Peruško D. Laser induced mixing in multilayered Ti/Ta thin film structures. in Optical and Quantum Electronics. 2018;50(6):257.
doi:10.1007/s11082-018-1525-x .

Obradović, Marko O., Kovač, Janez, Petrović, Suzana, Lazović, Vladimir M., Salatić, Branislav, Ciganović, Jovan, Pjević, Dejan J., Milosavljević, Momir, Peruško, Davor, "Laser induced mixing in multilayered Ti/Ta thin film structures" in Optical and Quantum Electronics, 50, no. 6 (2018):257,
https://doi.org/10.1007/s11082-018-1525-x . .

TY  - THES
AU  - Pjević, Dejan J.
PY  - 2018
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=6553
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:19310/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=99999&RID=50913551
UR  - http://nardus.mpn.gov.rs/123456789/10674
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8131
AB  - The subject of this PhD thesis is formation and characterization of TiO2 thin layers deposited by three different physical vapor deposition (PVD) methods. The aim was to define conditions for producing thin layers with optical characteristics that are desirable for photocatalytic purposes. Beside monitoring the impact of deposition parameters during synthesis of TiO2 thin layers, to achieve the aim effects of different annealing conditions were investigated, roles of the oxygen and titanium vacancy places in the crystal lattice and effects of nitrogen doping and role of the nitrogen incorporation sites in crystal lattice on optical and photocatalytic properties were studied. Some of the characterization techniques employed in this research were transmission electron microscopy, Rutherford backscattering spectrometry, X-ray diffraction and spectroscopy techniques: X-ray photoemission and UV/Vis. Experimental results in the thesis are divided into three sections which are referred to PVD method used for deposition of thin films: e-beam assisted evaporation, RF magnetron sputtering and reactive ion sputtering...
AB  - Предмет истраживања ове докторске дисертације обухвата формирање танких слојева TiO2 уз помоћ три различите физичке методе депоновања и њихову карактеризацију. Циљ је проналажење најпогодније методе и услова синтезе којом би се добили ТiO2 танки слојеви са оптичким особинама које су пожељне за њихову фотокаталитичку примену. У сврху постизања тог циља поред промене различитих параметара приликом синтезе слојева, посматрани су и ефекти одгревања слојева под различитим условима, улога вакантних места кисеоника и титана у кристалној структури као и ефекти допирања азотом и улога места уградње примесних атома у кристалну решетку на оптичке и фотокаталитичке особине материјала. За карактеризацију добијених слојева најчешће коришћене технике у оквиру ове дисертације су: трансмисиона електронска микроскопија, спектрометрија Радерфордовим повратним расејањем, рендгенска кристалографија и спектроскопске методе: фотоемисија изазвана меким Х-зрацима и UV/Vis. Експериментални део рада је подељен у три целине и то према методама којима су формирани TiO2 танки слојеви: напаравање помоћу снопа електрона, радио-фреквентно реактивно распрашивање и реактивно распрашивање јонским снопом.
PB  - Универзитет у Београду, Физички факултет
T2  - Универзитет у Београду
T1  - Проучавање и модификација танких слојева ТiО2 добијених физичким методама депоновања за фотокаталитичку примену
UR  - https://hdl.handle.net/21.15107/rcub_nardus_10674
ER  - 

@phdthesis{
author = "Pjević, Dejan J.",
year = "2018",
abstract = "The subject of this PhD thesis is formation and characterization of TiO2 thin layers deposited by three different physical vapor deposition (PVD) methods. The aim was to define conditions for producing thin layers with optical characteristics that are desirable for photocatalytic purposes. Beside monitoring the impact of deposition parameters during synthesis of TiO2 thin layers, to achieve the aim effects of different annealing conditions were investigated, roles of the oxygen and titanium vacancy places in the crystal lattice and effects of nitrogen doping and role of the nitrogen incorporation sites in crystal lattice on optical and photocatalytic properties were studied. Some of the characterization techniques employed in this research were transmission electron microscopy, Rutherford backscattering spectrometry, X-ray diffraction and spectroscopy techniques: X-ray photoemission and UV/Vis. Experimental results in the thesis are divided into three sections which are referred to PVD method used for deposition of thin films: e-beam assisted evaporation, RF magnetron sputtering and reactive ion sputtering..., Предмет истраживања ове докторске дисертације обухвата формирање танких слојева TiO2 уз помоћ три различите физичке методе депоновања и њихову карактеризацију. Циљ је проналажење најпогодније методе и услова синтезе којом би се добили ТiO2 танки слојеви са оптичким особинама које су пожељне за њихову фотокаталитичку примену. У сврху постизања тог циља поред промене различитих параметара приликом синтезе слојева, посматрани су и ефекти одгревања слојева под различитим условима, улога вакантних места кисеоника и титана у кристалној структури као и ефекти допирања азотом и улога места уградње примесних атома у кристалну решетку на оптичке и фотокаталитичке особине материјала. За карактеризацију добијених слојева најчешће коришћене технике у оквиру ове дисертације су: трансмисиона електронска микроскопија, спектрометрија Радерфордовим повратним расејањем, рендгенска кристалографија и спектроскопске методе: фотоемисија изазвана меким Х-зрацима и UV/Vis. Експериментални део рада је подељен у три целине и то према методама којима су формирани TiO2 танки слојеви: напаравање помоћу снопа електрона, радио-фреквентно реактивно распрашивање и реактивно распрашивање јонским снопом.",
publisher = "Универзитет у Београду, Физички факултет",
journal = "Универзитет у Београду",
title = "Проучавање и модификација танких слојева ТiО2 добијених физичким методама депоновања за фотокаталитичку примену",
url = "https://hdl.handle.net/21.15107/rcub_nardus_10674"
}

Pjević, D. J.. (2018). Проучавање и модификација танких слојева ТiО2 добијених физичким методама депоновања за фотокаталитичку примену. in Универзитет у Београду
Универзитет у Београду, Физички факултет..
https://hdl.handle.net/21.15107/rcub_nardus_10674

Pjević DJ. Проучавање и модификација танких слојева ТiО2 добијених физичким методама депоновања за фотокаталитичку примену. in Универзитет у Београду. 2018;.
https://hdl.handle.net/21.15107/rcub_nardus_10674 .

Pjević, Dejan J., "Проучавање и модификација танких слојева ТiО2 добијених физичким методама депоновања за фотокаталитичку примену" in Универзитет у Београду (2018),
https://hdl.handle.net/21.15107/rcub_nardus_10674 .

TY  - JOUR
AU  - Đorđević, Tijana
AU  - Radović, Ivan
AU  - Despoja, Vito
AU  - Lyon, Keenan
AU  - Borka, Duško
AU  - Mišković, Zoran L.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1831
AB  - We present an analytical modeling of the electron energy loss (EEL) spectroscopy data for free-standing graphene obtained by scanning transmission electron microscope. The probability density for energy loss of fast electrons traversing graphene under normal incidence is evaluated using an optical approximation based on the conductivity of graphene given in the local, i.e., frequency-dependent form derived by both a two-dimensional, two-fluid extended hydrodynamic (eHD) model and an ab initio method. We compare the results for the real and imaginary parts of the optical conductivity in graphene obtained by these two methods. The calculated probability density is directly compared with the EEL spectra from three independent experiments and we find very good agreement, especially in the case of the eHD model. Furthermore, we point out that the subtraction of the zero-loss peak from the experimental EEL spectra has a strong influence on the analytical model for the EEL spectroscopy data. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Ultramicroscopy
T1  - Analytical modeling of electron energy loss spectroscopy of graphene: Ab initio study versus extended hydrodynamic model
VL  - 184
SP  - 134
EP  - 142
DO  - 10.1016/j.ultramic.2017.08.014
ER  - 

@article{
author = "Đorđević, Tijana and Radović, Ivan and Despoja, Vito and Lyon, Keenan and Borka, Duško and Mišković, Zoran L.",
year = "2018",
abstract = "We present an analytical modeling of the electron energy loss (EEL) spectroscopy data for free-standing graphene obtained by scanning transmission electron microscope. The probability density for energy loss of fast electrons traversing graphene under normal incidence is evaluated using an optical approximation based on the conductivity of graphene given in the local, i.e., frequency-dependent form derived by both a two-dimensional, two-fluid extended hydrodynamic (eHD) model and an ab initio method. We compare the results for the real and imaginary parts of the optical conductivity in graphene obtained by these two methods. The calculated probability density is directly compared with the EEL spectra from three independent experiments and we find very good agreement, especially in the case of the eHD model. Furthermore, we point out that the subtraction of the zero-loss peak from the experimental EEL spectra has a strong influence on the analytical model for the EEL spectroscopy data. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Ultramicroscopy",
title = "Analytical modeling of electron energy loss spectroscopy of graphene: Ab initio study versus extended hydrodynamic model",
volume = "184",
pages = "134-142",
doi = "10.1016/j.ultramic.2017.08.014"
}

Đorđević, T., Radović, I., Despoja, V., Lyon, K., Borka, D.,& Mišković, Z. L.. (2018). Analytical modeling of electron energy loss spectroscopy of graphene: Ab initio study versus extended hydrodynamic model. in Ultramicroscopy, 184, 134-142.
https://doi.org/10.1016/j.ultramic.2017.08.014

Đorđević T, Radović I, Despoja V, Lyon K, Borka D, Mišković ZL. Analytical modeling of electron energy loss spectroscopy of graphene: Ab initio study versus extended hydrodynamic model. in Ultramicroscopy. 2018;184:134-142.
doi:10.1016/j.ultramic.2017.08.014 .

Đorđević, Tijana, Radović, Ivan, Despoja, Vito, Lyon, Keenan, Borka, Duško, Mišković, Zoran L., "Analytical modeling of electron energy loss spectroscopy of graphene: Ab initio study versus extended hydrodynamic model" in Ultramicroscopy, 184 (2018):134-142,
https://doi.org/10.1016/j.ultramic.2017.08.014 . .

TY  - JOUR
AU  - Toprek, Dragan
AU  - Koteski, Vasil J.
AU  - Belošević-Čavor, Jelena
AU  - Ivanovski, Valentin N.
AU  - Umićević, Ana
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1834
AB  - In this paper we investigated the effects of Fe-doping of the anatase TiO2 (1 0 1) surface on the crystal structure, electronic and optical properties, and impurity formation energy by means of density functional theory (DFT). The calculations were performed by the SIESTA DFT code and were carried out by using Troullier-Martins pseudopotentials for the 12-electron valence configuration (3s(2)3p(6)3d(2)4s(2)) of Ti atom, 6-electron valence configuration (2s(2)p(4)) of O atom and 8-electron valence configuration (3d(6)4s(2)) of Fe atom. We used a double- zeta basis set including polarization functions. All calculations were spin-polarized. The mechanism of narrowing the band gap and increasing the photocatalytic activity in the visible light region, of the doped TiO2 is discussed by investigating the density of state. The band gap decreases as the concentration of the dopant increases. The Partial Density of States (PDOS) is not the same in the case of spin-up state or spin-down state. Enhanced optical absorption, for light polarized in the z direction (parallel to the surface normal) is clearly observed for Fe doped as compared to the pure anatase TiO2 and the optical absorption is found to increase with the increase in the Fe concentration. The DFT results indicate that the source of the increasing photocatalytic activity in the visible light region of the Fe doped material is due to the introduction of additional electronic states within the band gap. Since the Fe atoms are more stable in Ti substitutional lattice positions for the entire range of Fermi energy E-F over the band gap, only this substitutional position is considered. We hope that our results will highlight a route to improved electronic and optical properties of anatase TiO2 for industrial applications. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Computational and Theoretical Chemistry
T1  - Ab initio study of electronic and optical properties of Fe doped anatase TiO2 (101) surface
VL  - 1120
SP  - 17
EP  - 23
DO  - 10.1016/j.comptc.2017.09.024
ER  - 

@article{
author = "Toprek, Dragan and Koteski, Vasil J. and Belošević-Čavor, Jelena and Ivanovski, Valentin N. and Umićević, Ana",
year = "2017",
abstract = "In this paper we investigated the effects of Fe-doping of the anatase TiO2 (1 0 1) surface on the crystal structure, electronic and optical properties, and impurity formation energy by means of density functional theory (DFT). The calculations were performed by the SIESTA DFT code and were carried out by using Troullier-Martins pseudopotentials for the 12-electron valence configuration (3s(2)3p(6)3d(2)4s(2)) of Ti atom, 6-electron valence configuration (2s(2)p(4)) of O atom and 8-electron valence configuration (3d(6)4s(2)) of Fe atom. We used a double- zeta basis set including polarization functions. All calculations were spin-polarized. The mechanism of narrowing the band gap and increasing the photocatalytic activity in the visible light region, of the doped TiO2 is discussed by investigating the density of state. The band gap decreases as the concentration of the dopant increases. The Partial Density of States (PDOS) is not the same in the case of spin-up state or spin-down state. Enhanced optical absorption, for light polarized in the z direction (parallel to the surface normal) is clearly observed for Fe doped as compared to the pure anatase TiO2 and the optical absorption is found to increase with the increase in the Fe concentration. The DFT results indicate that the source of the increasing photocatalytic activity in the visible light region of the Fe doped material is due to the introduction of additional electronic states within the band gap. Since the Fe atoms are more stable in Ti substitutional lattice positions for the entire range of Fermi energy E-F over the band gap, only this substitutional position is considered. We hope that our results will highlight a route to improved electronic and optical properties of anatase TiO2 for industrial applications. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Computational and Theoretical Chemistry",
title = "Ab initio study of electronic and optical properties of Fe doped anatase TiO2 (101) surface",
volume = "1120",
pages = "17-23",
doi = "10.1016/j.comptc.2017.09.024"
}

Toprek, D., Koteski, V. J., Belošević-Čavor, J., Ivanovski, V. N.,& Umićević, A.. (2017). Ab initio study of electronic and optical properties of Fe doped anatase TiO2 (101) surface. in Computational and Theoretical Chemistry, 1120, 17-23.
https://doi.org/10.1016/j.comptc.2017.09.024

Toprek D, Koteski VJ, Belošević-Čavor J, Ivanovski VN, Umićević A. Ab initio study of electronic and optical properties of Fe doped anatase TiO2 (101) surface. in Computational and Theoretical Chemistry. 2017;1120:17-23.
doi:10.1016/j.comptc.2017.09.024 .

Toprek, Dragan, Koteski, Vasil J., Belošević-Čavor, Jelena, Ivanovski, Valentin N., Umićević, Ana, "Ab initio study of electronic and optical properties of Fe doped anatase TiO2 (101) surface" in Computational and Theoretical Chemistry, 1120 (2017):17-23,
https://doi.org/10.1016/j.comptc.2017.09.024 . .

TY  - JOUR
AU  - Peruško, Davor
AU  - Kovač, Janez
AU  - Petrović, Suzana
AU  - Obradović, Marko O.
AU  - Mitrić, Miodrag
AU  - Pavlović, Vladimir B.
AU  - Salatić, Branislav
AU  - Jaksa, G.
AU  - Ciganović, Jovan
AU  - Milosavljević, Momir
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1725
AB  - Multilayers consisting of five (Al/Ti) bilayers were deposited on (100) silicon wafers. On top was deposited the Ti layer, aimed at preventing Al from diffusing to the surface upon laser treatment. The total thickness of the thin-film structure was 200 nm. Laser irradiations with Nd:YAG picoseconds laser pulses in the defocused regime were performed in air. Laser beam energy was 4 mJ and laser spot diameter on the sample surface was 3 mm (fluence 0.057 J cm(-2)). The samples were treated with different numbers of laser pulses. Structural characterizations were performed by different analytical methods and nano-hardness was also measured. Laser processing induced layer intermixing, formation of titanium aluminides, oxidation of the surface titanium layer and enhanced surface roughness. Aluminum appears at the sample surface only for the highest density of laser irradiation. Laser processing induces increment of nano-hardness by approximately 20% and decrease of residual Youngs modulus for a few percentages from the starting value of the untreated samples. These results can be interesting toward achieving structures with a selective extent of Al-Ti reactivity in this multilayered system, within the development of biocompatible materials.
T2  - Materials and Manufacturing Processes
T1  - Selective Al-Ti reactivity in laser-processed Al/Ti multilayers
VL  - 32
IS  - 14
SP  - 1622
EP  - 1627
DO  - 10.1080/10426914.2017.1279299
ER  - 

@article{
author = "Peruško, Davor and Kovač, Janez and Petrović, Suzana and Obradović, Marko O. and Mitrić, Miodrag and Pavlović, Vladimir B. and Salatić, Branislav and Jaksa, G. and Ciganović, Jovan and Milosavljević, Momir",
year = "2017",
abstract = "Multilayers consisting of five (Al/Ti) bilayers were deposited on (100) silicon wafers. On top was deposited the Ti layer, aimed at preventing Al from diffusing to the surface upon laser treatment. The total thickness of the thin-film structure was 200 nm. Laser irradiations with Nd:YAG picoseconds laser pulses in the defocused regime were performed in air. Laser beam energy was 4 mJ and laser spot diameter on the sample surface was 3 mm (fluence 0.057 J cm(-2)). The samples were treated with different numbers of laser pulses. Structural characterizations were performed by different analytical methods and nano-hardness was also measured. Laser processing induced layer intermixing, formation of titanium aluminides, oxidation of the surface titanium layer and enhanced surface roughness. Aluminum appears at the sample surface only for the highest density of laser irradiation. Laser processing induces increment of nano-hardness by approximately 20% and decrease of residual Youngs modulus for a few percentages from the starting value of the untreated samples. These results can be interesting toward achieving structures with a selective extent of Al-Ti reactivity in this multilayered system, within the development of biocompatible materials.",
journal = "Materials and Manufacturing Processes",
title = "Selective Al-Ti reactivity in laser-processed Al/Ti multilayers",
volume = "32",
number = "14",
pages = "1622-1627",
doi = "10.1080/10426914.2017.1279299"
}

Peruško, D., Kovač, J., Petrović, S., Obradović, M. O., Mitrić, M., Pavlović, V. B., Salatić, B., Jaksa, G., Ciganović, J.,& Milosavljević, M.. (2017). Selective Al-Ti reactivity in laser-processed Al/Ti multilayers. in Materials and Manufacturing Processes, 32(14), 1622-1627.
https://doi.org/10.1080/10426914.2017.1279299

Peruško D, Kovač J, Petrović S, Obradović MO, Mitrić M, Pavlović VB, Salatić B, Jaksa G, Ciganović J, Milosavljević M. Selective Al-Ti reactivity in laser-processed Al/Ti multilayers. in Materials and Manufacturing Processes. 2017;32(14):1622-1627.
doi:10.1080/10426914.2017.1279299 .

Peruško, Davor, Kovač, Janez, Petrović, Suzana, Obradović, Marko O., Mitrić, Miodrag, Pavlović, Vladimir B., Salatić, Branislav, Jaksa, G., Ciganović, Jovan, Milosavljević, Momir, "Selective Al-Ti reactivity in laser-processed Al/Ti multilayers" in Materials and Manufacturing Processes, 32, no. 14 (2017):1622-1627,
https://doi.org/10.1080/10426914.2017.1279299 . .

TY  - JOUR
AU  - Despoja, Vito
AU  - Đorđević, Tijana
AU  - Karbunar, Lazar
AU  - Radović, Ivan
AU  - Mišković, Zoran L.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1693
AB  - The propagator of a dynamically screened Coulomb interaction W in a sandwichlike structure consisting of two graphene layers separated by a slab of Al2O3 (or vacuum) is derived from single-layer graphene response functions and by using a local dielectric function for the bulk Al2O3. The response function of graphene is obtained using two approaches within the random phase approximation (RPA): an ab initio method that includes all electronic bands in graphene and a computationally less demanding method based on the massless Dirac fermion (MDF) approximation for the low-energy excitations of electrons in the p bands. The propagator W is used to derive an expression for the effective dielectric function of our sandwich structure, which is relevant for the reflection electron energy loss spectroscopy of its surface. Focusing on the range of frequencies from THz to mid-infrared, special attention is paid to finding an accurate optical limit in the ab initio method, where the response function is expressed in terms of a frequency-dependent conductivity of graphene. It was shown that the optical limit suffices for describing hybridization between the Dirac plasmons in graphene layers and the Fuchs-Kliewer phonons in both surfaces of the Al2O3 slab, and that the spectra obtained from both the ab initio method and the MDF approximation in the optical limit agree perfectly well for wave numbers up to about 0.1 nm(-1). Going beyond the optical limit, the agreement between the full ab initio method and the MDF approximation was found to extend to wave numbers up to about 0.3 nm(-1) for doped graphene layers with the Fermi energy of 0.2 eV.
T2  - Physical Review B: Condensed Matter and Materials Physics
T1  - Ab initio study of the electron energy loss function in a graphene-sapphire-graphene composite system
VL  - 96
IS  - 7
DO  - 10.1103/PhysRevB.96.075433
ER  - 

@article{
author = "Despoja, Vito and Đorđević, Tijana and Karbunar, Lazar and Radović, Ivan and Mišković, Zoran L.",
year = "2017",
abstract = "The propagator of a dynamically screened Coulomb interaction W in a sandwichlike structure consisting of two graphene layers separated by a slab of Al2O3 (or vacuum) is derived from single-layer graphene response functions and by using a local dielectric function for the bulk Al2O3. The response function of graphene is obtained using two approaches within the random phase approximation (RPA): an ab initio method that includes all electronic bands in graphene and a computationally less demanding method based on the massless Dirac fermion (MDF) approximation for the low-energy excitations of electrons in the p bands. The propagator W is used to derive an expression for the effective dielectric function of our sandwich structure, which is relevant for the reflection electron energy loss spectroscopy of its surface. Focusing on the range of frequencies from THz to mid-infrared, special attention is paid to finding an accurate optical limit in the ab initio method, where the response function is expressed in terms of a frequency-dependent conductivity of graphene. It was shown that the optical limit suffices for describing hybridization between the Dirac plasmons in graphene layers and the Fuchs-Kliewer phonons in both surfaces of the Al2O3 slab, and that the spectra obtained from both the ab initio method and the MDF approximation in the optical limit agree perfectly well for wave numbers up to about 0.1 nm(-1). Going beyond the optical limit, the agreement between the full ab initio method and the MDF approximation was found to extend to wave numbers up to about 0.3 nm(-1) for doped graphene layers with the Fermi energy of 0.2 eV.",
journal = "Physical Review B: Condensed Matter and Materials Physics",
title = "Ab initio study of the electron energy loss function in a graphene-sapphire-graphene composite system",
volume = "96",
number = "7",
doi = "10.1103/PhysRevB.96.075433"
}

Despoja, V., Đorđević, T., Karbunar, L., Radović, I.,& Mišković, Z. L.. (2017). Ab initio study of the electron energy loss function in a graphene-sapphire-graphene composite system. in Physical Review B: Condensed Matter and Materials Physics, 96(7).
https://doi.org/10.1103/PhysRevB.96.075433

Despoja V, Đorđević T, Karbunar L, Radović I, Mišković ZL. Ab initio study of the electron energy loss function in a graphene-sapphire-graphene composite system. in Physical Review B: Condensed Matter and Materials Physics. 2017;96(7).
doi:10.1103/PhysRevB.96.075433 .

Despoja, Vito, Đorđević, Tijana, Karbunar, Lazar, Radović, Ivan, Mišković, Zoran L., "Ab initio study of the electron energy loss function in a graphene-sapphire-graphene composite system" in Physical Review B: Condensed Matter and Materials Physics, 96, no. 7 (2017),
https://doi.org/10.1103/PhysRevB.96.075433 . .

TY  - JOUR
AU  - Amati, Matteo
AU  - Gregoratti, Luca
AU  - Sezen, Hikmet
AU  - Grce, Ana
AU  - Milosavljević, Momir
AU  - Homewood, Kevin P.
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1578
AB  - This paper reports on compositional and structural modifications induced in coated AlN/TiN multilayers by argon ion irradiation. The initial structure consisting of totally 30 alternate AlN (8 nm thick) and TiN (9.3 nm thick) layers was deposited on Si (100) wafers, by reactive sputtering. Irradiation was done with 180 keV Ar+ to a high dose of 8 x 10(16) ions/cm(2), which introduces up to similar to 10 at.% of argon species, and generates a maximum displacement per atom of 92 for AlN and 127 for TiN, around the projected ion range (109 +/- 34 nm). Characterizations were performed by Rutherford backscattering spectrometry, spatially resolved x-ray photoelectron spectroscopy, and transmission electron microscopy. The obtained results reveal that this highly immiscible and thermally stable system suffered a severe modification upon the applied ion irradiation, although it was performed at room temperature. They illustrate a thorough inter-layer mixing, atomic redistribution, structural change and phase transformation within the affected depth. The original TiN layers appear to grow in thickness, consuming the adjacent AlN layers, while retaining the fcc crystalline structure. In the mostly affected region, the interaction proceeds until all of the original AlN layers are consumed. Compositional studies with photoemission spectroscopy show that due to the ion irradiation treatment the TiN and AlN layers are transformed into Ti0.75Al0.25N and Ti0.65Al0.35N ternary compounds characterized by a better homogenized chemical form compared to non-irradiated layers. The results can be interesting towards further development of radiation tolerant materials based on immiscible ceramic nanocomposites. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Compositional and structural studies of ion-beam modified AlN/TiN multilayers
VL  - 411
SP  - 431
EP  - 436
DO  - 10.1016/j.apsusc.2017.03.160
ER  - 

@article{
author = "Amati, Matteo and Gregoratti, Luca and Sezen, Hikmet and Grce, Ana and Milosavljević, Momir and Homewood, Kevin P.",
year = "2017",
abstract = "This paper reports on compositional and structural modifications induced in coated AlN/TiN multilayers by argon ion irradiation. The initial structure consisting of totally 30 alternate AlN (8 nm thick) and TiN (9.3 nm thick) layers was deposited on Si (100) wafers, by reactive sputtering. Irradiation was done with 180 keV Ar+ to a high dose of 8 x 10(16) ions/cm(2), which introduces up to similar to 10 at.% of argon species, and generates a maximum displacement per atom of 92 for AlN and 127 for TiN, around the projected ion range (109 +/- 34 nm). Characterizations were performed by Rutherford backscattering spectrometry, spatially resolved x-ray photoelectron spectroscopy, and transmission electron microscopy. The obtained results reveal that this highly immiscible and thermally stable system suffered a severe modification upon the applied ion irradiation, although it was performed at room temperature. They illustrate a thorough inter-layer mixing, atomic redistribution, structural change and phase transformation within the affected depth. The original TiN layers appear to grow in thickness, consuming the adjacent AlN layers, while retaining the fcc crystalline structure. In the mostly affected region, the interaction proceeds until all of the original AlN layers are consumed. Compositional studies with photoemission spectroscopy show that due to the ion irradiation treatment the TiN and AlN layers are transformed into Ti0.75Al0.25N and Ti0.65Al0.35N ternary compounds characterized by a better homogenized chemical form compared to non-irradiated layers. The results can be interesting towards further development of radiation tolerant materials based on immiscible ceramic nanocomposites. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Compositional and structural studies of ion-beam modified AlN/TiN multilayers",
volume = "411",
pages = "431-436",
doi = "10.1016/j.apsusc.2017.03.160"
}

Amati, M., Gregoratti, L., Sezen, H., Grce, A., Milosavljević, M.,& Homewood, K. P.. (2017). Compositional and structural studies of ion-beam modified AlN/TiN multilayers. in Applied Surface Science, 411, 431-436.
https://doi.org/10.1016/j.apsusc.2017.03.160

Amati M, Gregoratti L, Sezen H, Grce A, Milosavljević M, Homewood KP. Compositional and structural studies of ion-beam modified AlN/TiN multilayers. in Applied Surface Science. 2017;411:431-436.
doi:10.1016/j.apsusc.2017.03.160 .

Amati, Matteo, Gregoratti, Luca, Sezen, Hikmet, Grce, Ana, Milosavljević, Momir, Homewood, Kevin P., "Compositional and structural studies of ion-beam modified AlN/TiN multilayers" in Applied Surface Science, 411 (2017):431-436,
https://doi.org/10.1016/j.apsusc.2017.03.160 . .

TY  - CONF
AU  - Karbunar, Lazar
AU  - Despoja, Vito
AU  - Radović, Ivan
AU  - Mišković, Zoran
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12644
AB  - We present a method to introduce several graphene sheets into the non-retarded Green’s function for a layered structure containing polar insulators, which support transverse optical phonon modes. Dispersion relations are derived to illustrate hybridization of Dirac plasmons in two graphene sheets with phonon modes in an oxide spacer layer between them.
PB  - University of Belgrade : Faculty of Physics
C3  - SPIG 2016 : 28th Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers & abstracts of invited lectures, topical invited lectures, progress reports and workshop lectures
T1  - Plasmon-phonon hybridization in layered structures including graphene
SP  - 154
EP  - 157
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12644
ER  - 

@conference{
author = "Karbunar, Lazar and Despoja, Vito and Radović, Ivan and Mišković, Zoran",
year = "2016",
abstract = "We present a method to introduce several graphene sheets into the non-retarded Green’s function for a layered structure containing polar insulators, which support transverse optical phonon modes. Dispersion relations are derived to illustrate hybridization of Dirac plasmons in two graphene sheets with phonon modes in an oxide spacer layer between them.",
publisher = "University of Belgrade : Faculty of Physics",
journal = "SPIG 2016 : 28th Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers & abstracts of invited lectures, topical invited lectures, progress reports and workshop lectures",
title = "Plasmon-phonon hybridization in layered structures including graphene",
pages = "154-157",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12644"
}

Karbunar, L., Despoja, V., Radović, I.,& Mišković, Z.. (2016). Plasmon-phonon hybridization in layered structures including graphene. in SPIG 2016 : 28th Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers & abstracts of invited lectures, topical invited lectures, progress reports and workshop lectures
University of Belgrade : Faculty of Physics., 154-157.
https://hdl.handle.net/21.15107/rcub_vinar_12644

Karbunar L, Despoja V, Radović I, Mišković Z. Plasmon-phonon hybridization in layered structures including graphene. in SPIG 2016 : 28th Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers & abstracts of invited lectures, topical invited lectures, progress reports and workshop lectures. 2016;:154-157.
https://hdl.handle.net/21.15107/rcub_vinar_12644 .

Karbunar, Lazar, Despoja, Vito, Radović, Ivan, Mišković, Zoran, "Plasmon-phonon hybridization in layered structures including graphene" in SPIG 2016 : 28th Summer School and International Symposium on the Physics of Ionized Gases : Contributed papers & abstracts of invited lectures, topical invited lectures, progress reports and workshop lectures (2016):154-157,
https://hdl.handle.net/21.15107/rcub_vinar_12644 .

TY  - JOUR
AU  - Toprek, Dragan
AU  - Koteski, Vasil J.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/981
AB  - The stability and structure of titanium doped gold clusters (AunTi; n = 1-32) are studied by density functional theory calculations, as implemented in the first principles code SIESTA. The exchange and correlation effects were calculated within the generalized gradient approximation (GGA) parametrized by Perdew, Burke and Ernzerhof (PBE). We used norm conserving Troullier-Martins pseudopotentials for the 10-electron valence configuration of Ti and 11-electron valence configuration of Au. All calculations were spin-polarized. The global energy minimum geometries of the clusters were searched for by using the simulated annealing technique. The stability of the clusters is discussed on the basis of the binding energy per atom, second-order energy difference, vertical ionization potential, vertical electron affinities, HOMO-LUMO energy gap and vibrational frequencies. Based on the simultaneous criteria of high binding energy, high band gap, high vertical ionization potential, and low electron affinity, it is found that Au4Ti and Au14Ti clusters have a higher stability and are candidates for magic clusters, which confirms the already known results from previous works. The new result presented in this paper is that the Au20Ti and Au30Ti clusters have a higher stability too. In general, the clusters with even n are more stable than the clusters with odd n. Most of the clusters with even n are non-magnetic (total magnetic moment is zero). Our results also suggest that only the Au3Ti, Au7Ti and Au8Ti clusters have a planar structure. (C) 2016 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Computational and Theoretical Chemistry
T1  - Ab initio calculations of the structure, energetics and stability of AunTi (n=1-32) clusters
VL  - 1081
SP  - 9
EP  - 17
DO  - 10.1016/j.comptc.2016.02.005
ER  - 

@article{
author = "Toprek, Dragan and Koteski, Vasil J.",
year = "2016",
abstract = "The stability and structure of titanium doped gold clusters (AunTi; n = 1-32) are studied by density functional theory calculations, as implemented in the first principles code SIESTA. The exchange and correlation effects were calculated within the generalized gradient approximation (GGA) parametrized by Perdew, Burke and Ernzerhof (PBE). We used norm conserving Troullier-Martins pseudopotentials for the 10-electron valence configuration of Ti and 11-electron valence configuration of Au. All calculations were spin-polarized. The global energy minimum geometries of the clusters were searched for by using the simulated annealing technique. The stability of the clusters is discussed on the basis of the binding energy per atom, second-order energy difference, vertical ionization potential, vertical electron affinities, HOMO-LUMO energy gap and vibrational frequencies. Based on the simultaneous criteria of high binding energy, high band gap, high vertical ionization potential, and low electron affinity, it is found that Au4Ti and Au14Ti clusters have a higher stability and are candidates for magic clusters, which confirms the already known results from previous works. The new result presented in this paper is that the Au20Ti and Au30Ti clusters have a higher stability too. In general, the clusters with even n are more stable than the clusters with odd n. Most of the clusters with even n are non-magnetic (total magnetic moment is zero). Our results also suggest that only the Au3Ti, Au7Ti and Au8Ti clusters have a planar structure. (C) 2016 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Computational and Theoretical Chemistry",
title = "Ab initio calculations of the structure, energetics and stability of AunTi (n=1-32) clusters",
volume = "1081",
pages = "9-17",
doi = "10.1016/j.comptc.2016.02.005"
}

Toprek, D.,& Koteski, V. J.. (2016). Ab initio calculations of the structure, energetics and stability of AunTi (n=1-32) clusters. in Computational and Theoretical Chemistry
Elsevier., 1081, 9-17.
https://doi.org/10.1016/j.comptc.2016.02.005

Toprek D, Koteski VJ. Ab initio calculations of the structure, energetics and stability of AunTi (n=1-32) clusters. in Computational and Theoretical Chemistry. 2016;1081:9-17.
doi:10.1016/j.comptc.2016.02.005 .

Toprek, Dragan, Koteski, Vasil J., "Ab initio calculations of the structure, energetics and stability of AunTi (n=1-32) clusters" in Computational and Theoretical Chemistry, 1081 (2016):9-17,
https://doi.org/10.1016/j.comptc.2016.02.005 . .

TY  - JOUR
AU  - Kasiuk, Julia
AU  - Fedotova, Julia
AU  - Przewoznik, Janusz
AU  - Kapusta, Czeslaw
AU  - Sikora, Marcin
AU  - Zukrowski, Jan
AU  - Grce, Ana
AU  - Milosavljević, Momir
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/962
AB  - Results of the study of oxidised (FeCoZr)(x)(CaF2)(100) (- x) films in a wide composition range (30 LT = x LT = 74 at.%) sintered at oxygen pressures P-O = 43 and 9.8 mPa with X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray absorption spectroscopy (XAS), Fe-57 Mossbauer spectroscopy (MS), and vibrating sample magnetometry (VSM) are reported. A crystalline metallic core-amorphous oxide shell structure of nanoparticles (NPs) in films oxidised at lower P-O = 43 mPa is observed in TEM images. A combined use of XRD, MS and XAS techniques provides identification of NP phase composition evidencing alpha-FeCo(Zr) core of the variable content depending on x and a complex oxide shell including amorphous alpha-Fe23+O3 together with Co1 - y2+Fey2+O at low x (30-36 at%). Full oxidation of NPs at higher P-O = 9.8 mPa is indicated by TEM, XRD, MS and XAS patterns evidencing the formation of crystalline Co1 - y2+Fey2+O core-amorphous alpha-Fe23+O3 shell structure. Progressive oxidation of NPs with decreasing x at P-O = 4.3 mPa as well as with Po increase is followed by variation of average centre shifts LT delta GT obtained from deconvoluted Fe-57 Mossbauer spectra. Magnetometry measurements of films sintered at P-O = 43 mPa reveal an effect of exchange bias confirming ferromagnetic metallic core-antiferromagnetic oxide shell structure of NPs. The results show that phase composition of oxide shells is governed both by concentration of oxygen available during synthesis and on the x. Schemes of progressive NP oxidation with identified phase composition as a function of P-o and x values are proposed. (C) 2016 Elsevier Inc. All rights reserved.
PB  - Elsevier
T2  - Materials Characterization
T1  - Oxidation controlled phase composition of FeCo(Zr) nanoparticles in CaF2 matrix
VL  - 113
SP  - 71
EP  - 81
DO  - 10.1016/j.matchar.2016.01.010
ER  - 

@article{
author = "Kasiuk, Julia and Fedotova, Julia and Przewoznik, Janusz and Kapusta, Czeslaw and Sikora, Marcin and Zukrowski, Jan and Grce, Ana and Milosavljević, Momir",
year = "2016",
abstract = "Results of the study of oxidised (FeCoZr)(x)(CaF2)(100) (- x) films in a wide composition range (30 LT = x LT = 74 at.%) sintered at oxygen pressures P-O = 43 and 9.8 mPa with X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray absorption spectroscopy (XAS), Fe-57 Mossbauer spectroscopy (MS), and vibrating sample magnetometry (VSM) are reported. A crystalline metallic core-amorphous oxide shell structure of nanoparticles (NPs) in films oxidised at lower P-O = 43 mPa is observed in TEM images. A combined use of XRD, MS and XAS techniques provides identification of NP phase composition evidencing alpha-FeCo(Zr) core of the variable content depending on x and a complex oxide shell including amorphous alpha-Fe23+O3 together with Co1 - y2+Fey2+O at low x (30-36 at%). Full oxidation of NPs at higher P-O = 9.8 mPa is indicated by TEM, XRD, MS and XAS patterns evidencing the formation of crystalline Co1 - y2+Fey2+O core-amorphous alpha-Fe23+O3 shell structure. Progressive oxidation of NPs with decreasing x at P-O = 4.3 mPa as well as with Po increase is followed by variation of average centre shifts LT delta GT obtained from deconvoluted Fe-57 Mossbauer spectra. Magnetometry measurements of films sintered at P-O = 43 mPa reveal an effect of exchange bias confirming ferromagnetic metallic core-antiferromagnetic oxide shell structure of NPs. The results show that phase composition of oxide shells is governed both by concentration of oxygen available during synthesis and on the x. Schemes of progressive NP oxidation with identified phase composition as a function of P-o and x values are proposed. (C) 2016 Elsevier Inc. All rights reserved.",
publisher = "Elsevier",
journal = "Materials Characterization",
title = "Oxidation controlled phase composition of FeCo(Zr) nanoparticles in CaF2 matrix",
volume = "113",
pages = "71-81",
doi = "10.1016/j.matchar.2016.01.010"
}

Kasiuk, J., Fedotova, J., Przewoznik, J., Kapusta, C., Sikora, M., Zukrowski, J., Grce, A.,& Milosavljević, M.. (2016). Oxidation controlled phase composition of FeCo(Zr) nanoparticles in CaF2 matrix. in Materials Characterization
Elsevier., 113, 71-81.
https://doi.org/10.1016/j.matchar.2016.01.010

Kasiuk J, Fedotova J, Przewoznik J, Kapusta C, Sikora M, Zukrowski J, Grce A, Milosavljević M. Oxidation controlled phase composition of FeCo(Zr) nanoparticles in CaF2 matrix. in Materials Characterization. 2016;113:71-81.
doi:10.1016/j.matchar.2016.01.010 .

Kasiuk, Julia, Fedotova, Julia, Przewoznik, Janusz, Kapusta, Czeslaw, Sikora, Marcin, Zukrowski, Jan, Grce, Ana, Milosavljević, Momir, "Oxidation controlled phase composition of FeCo(Zr) nanoparticles in CaF2 matrix" in Materials Characterization, 113 (2016):71-81,
https://doi.org/10.1016/j.matchar.2016.01.010 . .

TY  - JOUR
AU  - Marinković, Tijana
AU  - Radović, Ivan
AU  - Borka, Duško
AU  - Mišković, Zoran L.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/377
AB  - We study correlated motion of two ions resulting from a dissociative grazing scattering of a slow diatomic molecular ion on supported graphene. A low-frequency collective mode resulting from hybridization of graphenes Dirac plasmon and the optical phonon modes in the insulating substrate may be excited by matching its phase velocity with the ion speed lower than the graphene Fermi speed. The resulting wake effect gives rise to the strongly directional, oscillatory patterns in both the inter-particle interaction potential and the total stopping power for the two ions, which may be detectable in their angular and the energy loss spectra. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Physics Letters A
T1  - Wake effect in the interaction of slow correlated charges with supported graphene due to plasmon-phonon hybridization
VL  - 379
IS  - 4
SP  - 377
EP  - 381
DO  - 10.1016/j.physleta.2014.11.044
ER  - 

@article{
author = "Marinković, Tijana and Radović, Ivan and Borka, Duško and Mišković, Zoran L.",
year = "2015",
abstract = "We study correlated motion of two ions resulting from a dissociative grazing scattering of a slow diatomic molecular ion on supported graphene. A low-frequency collective mode resulting from hybridization of graphenes Dirac plasmon and the optical phonon modes in the insulating substrate may be excited by matching its phase velocity with the ion speed lower than the graphene Fermi speed. The resulting wake effect gives rise to the strongly directional, oscillatory patterns in both the inter-particle interaction potential and the total stopping power for the two ions, which may be detectable in their angular and the energy loss spectra. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Physics Letters A",
title = "Wake effect in the interaction of slow correlated charges with supported graphene due to plasmon-phonon hybridization",
volume = "379",
number = "4",
pages = "377-381",
doi = "10.1016/j.physleta.2014.11.044"
}

Marinković, T., Radović, I., Borka, D.,& Mišković, Z. L.. (2015). Wake effect in the interaction of slow correlated charges with supported graphene due to plasmon-phonon hybridization. in Physics Letters A, 379(4), 377-381.
https://doi.org/10.1016/j.physleta.2014.11.044

Marinković T, Radović I, Borka D, Mišković ZL. Wake effect in the interaction of slow correlated charges with supported graphene due to plasmon-phonon hybridization. in Physics Letters A. 2015;379(4):377-381.
doi:10.1016/j.physleta.2014.11.044 .

Marinković, Tijana, Radović, Ivan, Borka, Duško, Mišković, Zoran L., "Wake effect in the interaction of slow correlated charges with supported graphene due to plasmon-phonon hybridization" in Physics Letters A, 379, no. 4 (2015):377-381,
https://doi.org/10.1016/j.physleta.2014.11.044 . .

TY  - JOUR
AU  - Pjević, Dejan J.
AU  - Obradović, Marko O.
AU  - Marinković, Tijana
AU  - Grce, Ana
AU  - Milosavljević, Momir
AU  - Grieseler, Rolf
AU  - Kups, Thomas
AU  - Wilke, Marcus
AU  - Schaaf, Peter
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/436
AB  - The influence of sputtering parameters and annealing on the structure and optical properties of TiO2 thin films deposited by RF magnetron sputtering is reported. A pure TiO2 target was used to deposit the films on Si(100) and glass substrates, and Ar/O-2 gas mixture was used for sputtering. It was found that both the structure and the optical properties of the films depend on deposition parameters and annealing. In all cases the as deposited films were oxygen deficient, which could be compensated by post deposition annealing. Changes in the Ar/O-2 mass flow rate affected the films from an amorphous like structure for samples deposited without oxygen to a structure where nano crystalline Futile phase is detected in those deposited with O-2. Annealing of the samples yielded growth of both, ruffle and anatase phases, the ratio depending on the added oxygen content. Increasing mass flow rate of O-2 and annealing are responsible for lowering of the energy band gap values and the increase in refractive index of the films. The results can be interesting towards the development of TiO2 thin films with defined structure and properties. (C) 2015 Elsevier EN. All rights reserved.
T2  - Physica B: Condensed Matter
T1  - Properties of sputtered TiO2 thin films as a function of deposition and annealing parameters
VL  - 463
SP  - 20
EP  - 25
DO  - 10.1016/j.physb.2015.01.037
ER  - 

@article{
author = "Pjević, Dejan J. and Obradović, Marko O. and Marinković, Tijana and Grce, Ana and Milosavljević, Momir and Grieseler, Rolf and Kups, Thomas and Wilke, Marcus and Schaaf, Peter",
year = "2015",
abstract = "The influence of sputtering parameters and annealing on the structure and optical properties of TiO2 thin films deposited by RF magnetron sputtering is reported. A pure TiO2 target was used to deposit the films on Si(100) and glass substrates, and Ar/O-2 gas mixture was used for sputtering. It was found that both the structure and the optical properties of the films depend on deposition parameters and annealing. In all cases the as deposited films were oxygen deficient, which could be compensated by post deposition annealing. Changes in the Ar/O-2 mass flow rate affected the films from an amorphous like structure for samples deposited without oxygen to a structure where nano crystalline Futile phase is detected in those deposited with O-2. Annealing of the samples yielded growth of both, ruffle and anatase phases, the ratio depending on the added oxygen content. Increasing mass flow rate of O-2 and annealing are responsible for lowering of the energy band gap values and the increase in refractive index of the films. The results can be interesting towards the development of TiO2 thin films with defined structure and properties. (C) 2015 Elsevier EN. All rights reserved.",
journal = "Physica B: Condensed Matter",
title = "Properties of sputtered TiO2 thin films as a function of deposition and annealing parameters",
volume = "463",
pages = "20-25",
doi = "10.1016/j.physb.2015.01.037"
}

Pjević, D. J., Obradović, M. O., Marinković, T., Grce, A., Milosavljević, M., Grieseler, R., Kups, T., Wilke, M.,& Schaaf, P.. (2015). Properties of sputtered TiO2 thin films as a function of deposition and annealing parameters. in Physica B: Condensed Matter, 463, 20-25.
https://doi.org/10.1016/j.physb.2015.01.037

Pjević DJ, Obradović MO, Marinković T, Grce A, Milosavljević M, Grieseler R, Kups T, Wilke M, Schaaf P. Properties of sputtered TiO2 thin films as a function of deposition and annealing parameters. in Physica B: Condensed Matter. 2015;463:20-25.
doi:10.1016/j.physb.2015.01.037 .

Pjević, Dejan J., Obradović, Marko O., Marinković, Tijana, Grce, Ana, Milosavljević, Momir, Grieseler, Rolf, Kups, Thomas, Wilke, Marcus, Schaaf, Peter, "Properties of sputtered TiO2 thin films as a function of deposition and annealing parameters" in Physica B: Condensed Matter, 463 (2015):20-25,
https://doi.org/10.1016/j.physb.2015.01.037 . .

TY  - JOUR
AU  - Obradović, Marko O.
AU  - Pjević, Dejan J.
AU  - Peruško, Davor
AU  - Grce, Ana
AU  - Milosavljević, Momir
AU  - Homewood, Kevin P.
AU  - Siketic, Z.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7078
AB  - The effects of helium ion irradiation on immiscible AlN/TiN multilayered system were studied. The structure consisted of 30 alternate AlN (similar to 8 nm) and TiN (similar to 9.3 nm) layers of a total thickness around 260 nm, deposited on (100) Si substrates by reactive sputtering. The system was then implanted with 30 keV He+ to very high irradiation doses, 1-4 x 10(17) ions/cm(2). Evaluated projected ion range was 153.1 +/- 45.4 nm and maximum displacements per atom for the applied doses from 6 to 24. It was found that the multilayers remained well separated and stable after irradiation to 1 x 10(17) ions/cm(2), which introduces up to 10 at.% of He within the structure. The main effects were agglomeration of He bubbles around the projected ion range, mostly concentrated at the AlN edges of the interfaces, and a slight increase of the mean grain size within the affected zone. Increasing of the ion dose induced further agglomeration of bubbles, splitting of the layers at the interfaces, and final destruction of the structure. The evaluated He content was consistent with the implanted dose up to 2 x 10(17) ions/cm(2). For the highest dose the implanted gas is partially released from the structure. The results can be interesting towards the development of radiation tolerant materials. (C) 2015 Elsevier B.V. All rights reserved.
T2  - Thin Solid Films
T1  - Effects of helium ion irradiation on bubble formation in AlN/TiN multilayered system
VL  - 591
SP  - 164
EP  - 168
DO  - 10.1016/j.tsf.2015.03.074
ER  - 

@article{
author = "Obradović, Marko O. and Pjević, Dejan J. and Peruško, Davor and Grce, Ana and Milosavljević, Momir and Homewood, Kevin P. and Siketic, Z.",
year = "2015",
abstract = "The effects of helium ion irradiation on immiscible AlN/TiN multilayered system were studied. The structure consisted of 30 alternate AlN (similar to 8 nm) and TiN (similar to 9.3 nm) layers of a total thickness around 260 nm, deposited on (100) Si substrates by reactive sputtering. The system was then implanted with 30 keV He+ to very high irradiation doses, 1-4 x 10(17) ions/cm(2). Evaluated projected ion range was 153.1 +/- 45.4 nm and maximum displacements per atom for the applied doses from 6 to 24. It was found that the multilayers remained well separated and stable after irradiation to 1 x 10(17) ions/cm(2), which introduces up to 10 at.% of He within the structure. The main effects were agglomeration of He bubbles around the projected ion range, mostly concentrated at the AlN edges of the interfaces, and a slight increase of the mean grain size within the affected zone. Increasing of the ion dose induced further agglomeration of bubbles, splitting of the layers at the interfaces, and final destruction of the structure. The evaluated He content was consistent with the implanted dose up to 2 x 10(17) ions/cm(2). For the highest dose the implanted gas is partially released from the structure. The results can be interesting towards the development of radiation tolerant materials. (C) 2015 Elsevier B.V. All rights reserved.",
journal = "Thin Solid Films",
title = "Effects of helium ion irradiation on bubble formation in AlN/TiN multilayered system",
volume = "591",
pages = "164-168",
doi = "10.1016/j.tsf.2015.03.074"
}

Obradović, M. O., Pjević, D. J., Peruško, D., Grce, A., Milosavljević, M., Homewood, K. P.,& Siketic, Z.. (2015). Effects of helium ion irradiation on bubble formation in AlN/TiN multilayered system. in Thin Solid Films, 591, 164-168.
https://doi.org/10.1016/j.tsf.2015.03.074

Obradović MO, Pjević DJ, Peruško D, Grce A, Milosavljević M, Homewood KP, Siketic Z. Effects of helium ion irradiation on bubble formation in AlN/TiN multilayered system. in Thin Solid Films. 2015;591:164-168.
doi:10.1016/j.tsf.2015.03.074 .

Obradović, Marko O., Pjević, Dejan J., Peruško, Davor, Grce, Ana, Milosavljević, Momir, Homewood, Kevin P., Siketic, Z., "Effects of helium ion irradiation on bubble formation in AlN/TiN multilayered system" in Thin Solid Films, 591 (2015):164-168,
https://doi.org/10.1016/j.tsf.2015.03.074 . .

TY  - JOUR
AU  - Čevizović, Dalibor
AU  - Ivić, Zoran
AU  - Toprek, Dragan
AU  - Kapor, Darko
AU  - Pržulj, Željko
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/478
AB  - We study the properties of the single large adiabatic polaron in the substances composed of three parallel equally separated coplanar molecular chains. Particular attention has been devoted to the influence of the interchain coupling strength on polaron stability in order to elucidate the origin of the large polaron existence, which, contrary to the predictions of continuum adiabatic theories may persist in realistic conditions. Our results indicate the existence of the effectively two-dimensional stationary polarons with comparably large longitudinal radius while the transverse one ranges from zero, in the absence of interchain coupling, to approximately twice of the interchain separation when coupling strength tends towards the infinity. These two-dimensional polarons are both energetically and dynamically stable. This is quite the opposite to the expectations based on the traditional adiabatic large polaron theories which, in the case of short ranged electron phonon interaction, predict that the stable large polaron may exist only in 1D systems. Stability of these 2D polarons increases with the increase of the interchain coupling strength so that they may be comparably more stable than the pure 1D polarons. (C) 2015 Elsevier Ltd. All rights reserved.
T2  - Chaos, Solitons and Fractals
T1  - The influence of the interchain coupling on large acoustic polarons in coupled molecular chains: Three coplanar parallel molecular chains
VL  - 73
SP  - 71
EP  - 79
DO  - 10.1016/j.chaos.2015.01.002
ER  - 

@article{
author = "Čevizović, Dalibor and Ivić, Zoran and Toprek, Dragan and Kapor, Darko and Pržulj, Željko",
year = "2015",
abstract = "We study the properties of the single large adiabatic polaron in the substances composed of three parallel equally separated coplanar molecular chains. Particular attention has been devoted to the influence of the interchain coupling strength on polaron stability in order to elucidate the origin of the large polaron existence, which, contrary to the predictions of continuum adiabatic theories may persist in realistic conditions. Our results indicate the existence of the effectively two-dimensional stationary polarons with comparably large longitudinal radius while the transverse one ranges from zero, in the absence of interchain coupling, to approximately twice of the interchain separation when coupling strength tends towards the infinity. These two-dimensional polarons are both energetically and dynamically stable. This is quite the opposite to the expectations based on the traditional adiabatic large polaron theories which, in the case of short ranged electron phonon interaction, predict that the stable large polaron may exist only in 1D systems. Stability of these 2D polarons increases with the increase of the interchain coupling strength so that they may be comparably more stable than the pure 1D polarons. (C) 2015 Elsevier Ltd. All rights reserved.",
journal = "Chaos, Solitons and Fractals",
title = "The influence of the interchain coupling on large acoustic polarons in coupled molecular chains: Three coplanar parallel molecular chains",
volume = "73",
pages = "71-79",
doi = "10.1016/j.chaos.2015.01.002"
}

Čevizović, D., Ivić, Z., Toprek, D., Kapor, D.,& Pržulj, Ž.. (2015). The influence of the interchain coupling on large acoustic polarons in coupled molecular chains: Three coplanar parallel molecular chains. in Chaos, Solitons and Fractals, 73, 71-79.
https://doi.org/10.1016/j.chaos.2015.01.002

Čevizović D, Ivić Z, Toprek D, Kapor D, Pržulj Ž. The influence of the interchain coupling on large acoustic polarons in coupled molecular chains: Three coplanar parallel molecular chains. in Chaos, Solitons and Fractals. 2015;73:71-79.
doi:10.1016/j.chaos.2015.01.002 .

Čevizović, Dalibor, Ivić, Zoran, Toprek, Dragan, Kapor, Darko, Pržulj, Željko, "The influence of the interchain coupling on large acoustic polarons in coupled molecular chains: Three coplanar parallel molecular chains" in Chaos, Solitons and Fractals, 73 (2015):71-79,
https://doi.org/10.1016/j.chaos.2015.01.002 . .

TY  - JOUR
AU  - Marinković, Tijana
AU  - Radović, Ivan
AU  - Borka, Duško
AU  - Mišković, Zoran L.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/810
AB  - We use the dielectric response formalism to show how an incident charged particle may be used to probe the hybridization taking place between the Dirac plasmon in graphene and the surface optical phonon modes in a SiO2 substrate. Strong effects of this hybridization are found in the wake pattern in the induced potential, as well as in the stopping and image forces that act on the incident charge in a broad range of its velocities. Particularly intriguing is the possibility to control the plasmon-phonon hybridization by varying the doping density of graphene, where the regime of a nominally neutral graphene is expected to give rise to dramatic effects in the energy loss of charged particles that move at the velocities below the Fermi velocity of graphene.
PB  - Springer Nature
T2  - Plasmonics
T1  - Probing the Plasmon-Phonon Hybridization in Supported Graphene by Externally Moving Charged Particles
VL  - 10
IS  - 6
SP  - 1741
EP  - 1749
DO  - 10.1007/s11468-015-9993-3
ER  - 

@article{
author = "Marinković, Tijana and Radović, Ivan and Borka, Duško and Mišković, Zoran L.",
year = "2015",
abstract = "We use the dielectric response formalism to show how an incident charged particle may be used to probe the hybridization taking place between the Dirac plasmon in graphene and the surface optical phonon modes in a SiO2 substrate. Strong effects of this hybridization are found in the wake pattern in the induced potential, as well as in the stopping and image forces that act on the incident charge in a broad range of its velocities. Particularly intriguing is the possibility to control the plasmon-phonon hybridization by varying the doping density of graphene, where the regime of a nominally neutral graphene is expected to give rise to dramatic effects in the energy loss of charged particles that move at the velocities below the Fermi velocity of graphene.",
publisher = "Springer Nature",
journal = "Plasmonics",
title = "Probing the Plasmon-Phonon Hybridization in Supported Graphene by Externally Moving Charged Particles",
volume = "10",
number = "6",
pages = "1741-1749",
doi = "10.1007/s11468-015-9993-3"
}

Marinković, T., Radović, I., Borka, D.,& Mišković, Z. L.. (2015). Probing the Plasmon-Phonon Hybridization in Supported Graphene by Externally Moving Charged Particles. in Plasmonics
Springer Nature., 10(6), 1741-1749.
https://doi.org/10.1007/s11468-015-9993-3

Marinković T, Radović I, Borka D, Mišković ZL. Probing the Plasmon-Phonon Hybridization in Supported Graphene by Externally Moving Charged Particles. in Plasmonics. 2015;10(6):1741-1749.
doi:10.1007/s11468-015-9993-3 .

Marinković, Tijana, Radović, Ivan, Borka, Duško, Mišković, Zoran L., "Probing the Plasmon-Phonon Hybridization in Supported Graphene by Externally Moving Charged Particles" in Plasmonics, 10, no. 6 (2015):1741-1749,
https://doi.org/10.1007/s11468-015-9993-3 . .

TY  - JOUR
AU  - Bayev, Vadim
AU  - Streltsov, Eugene
AU  - Milosavljević, Momir
AU  - Malashchonak, Mikalai
AU  - Maximenko, Alexey
AU  - Koltunowicz, Tomasz N.
AU  - Zukowski, Pawel
AU  - Kierczynski, Konrad
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/745
AB  - Self-ordered arrays of Ni, Ni(50) Pd(50), and Ni(78) Pd(22) nanowires were synthesized by simultaneous electrochemical deposition of Ni and Pd components into porous templates of anodic aluminum oxide using alternating current. This paper is focused on the interplay of structure and chemical composition of Ni and Ni-Pd bicomponent nanowires arrays and the peculiarities of its magnetic anisotropy.
T2  - IEEE Transactions on Magnetics
T1  - Magnetic Anisotropy in Bicomponent Self-Assembled Ni and Ni-Pd Nanowires Studied by Magnetic Resonance Spectroscopy
VL  - 51
IS  - 10
DO  - 10.1109/TMAG.2015.2445733
ER  - 

@article{
author = "Bayev, Vadim and Streltsov, Eugene and Milosavljević, Momir and Malashchonak, Mikalai and Maximenko, Alexey and Koltunowicz, Tomasz N. and Zukowski, Pawel and Kierczynski, Konrad",
year = "2015",
abstract = "Self-ordered arrays of Ni, Ni(50) Pd(50), and Ni(78) Pd(22) nanowires were synthesized by simultaneous electrochemical deposition of Ni and Pd components into porous templates of anodic aluminum oxide using alternating current. This paper is focused on the interplay of structure and chemical composition of Ni and Ni-Pd bicomponent nanowires arrays and the peculiarities of its magnetic anisotropy.",
journal = "IEEE Transactions on Magnetics",
title = "Magnetic Anisotropy in Bicomponent Self-Assembled Ni and Ni-Pd Nanowires Studied by Magnetic Resonance Spectroscopy",
volume = "51",
number = "10",
doi = "10.1109/TMAG.2015.2445733"
}

Bayev, V., Streltsov, E., Milosavljević, M., Malashchonak, M., Maximenko, A., Koltunowicz, T. N., Zukowski, P.,& Kierczynski, K.. (2015). Magnetic Anisotropy in Bicomponent Self-Assembled Ni and Ni-Pd Nanowires Studied by Magnetic Resonance Spectroscopy. in IEEE Transactions on Magnetics, 51(10).
https://doi.org/10.1109/TMAG.2015.2445733

Bayev V, Streltsov E, Milosavljević M, Malashchonak M, Maximenko A, Koltunowicz TN, Zukowski P, Kierczynski K. Magnetic Anisotropy in Bicomponent Self-Assembled Ni and Ni-Pd Nanowires Studied by Magnetic Resonance Spectroscopy. in IEEE Transactions on Magnetics. 2015;51(10).
doi:10.1109/TMAG.2015.2445733 .

Bayev, Vadim, Streltsov, Eugene, Milosavljević, Momir, Malashchonak, Mikalai, Maximenko, Alexey, Koltunowicz, Tomasz N., Zukowski, Pawel, Kierczynski, Konrad, "Magnetic Anisotropy in Bicomponent Self-Assembled Ni and Ni-Pd Nanowires Studied by Magnetic Resonance Spectroscopy" in IEEE Transactions on Magnetics, 51, no. 10 (2015),
https://doi.org/10.1109/TMAG.2015.2445733 . .

TY  - JOUR
AU  - Toprek, Dragan
AU  - Belošević-Čavor, Jelena
AU  - Koteski, Vasil J.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/678
AB  - First principles calculations were performed in the framework of the density functional theory (DFF) using the Full Potential-Linear Augment Plane Wave method (FP-LAPW) within the generalized gradient approximation (GGA) to predict the structural, electronic, elastic and thermal properties of NiTi2 intermetallic compound. By using the Wien2k all-electron code, calculations of the ground state and electronic properties such as lattice constants, bulk modulus, presure derivative of bulk modulus, total energies and density of states were also included. The elastic constants and mechanical properties such as Poissons ratio, Youngs modulus and shear modulus are estimated from the calculated elastic constants of the single crystal. Through the quasi-harmonic Debye model, the preasure and temperature dependences of the linear expansion coefficient, bulk modulus and heat capacity have been investigated. Finally, the Debye temperature has been estimated from the average sound velocity according to the predicted polycrystal bulk properties and from the single crystal elastic constants. (C) 2015 Elsevier Ltd. All rights reserved.
T2  - Journal of Physics and Chemistry of Solids
T1  - Ab initio studies of the structural, elastic, electronic and thermal properties of NiTi2 intermetallic
VL  - 85
SP  - 197
EP  - 205
DO  - 10.1016/j.jpcs.2015.05.019
ER  - 

@article{
author = "Toprek, Dragan and Belošević-Čavor, Jelena and Koteski, Vasil J.",
year = "2015",
abstract = "First principles calculations were performed in the framework of the density functional theory (DFF) using the Full Potential-Linear Augment Plane Wave method (FP-LAPW) within the generalized gradient approximation (GGA) to predict the structural, electronic, elastic and thermal properties of NiTi2 intermetallic compound. By using the Wien2k all-electron code, calculations of the ground state and electronic properties such as lattice constants, bulk modulus, presure derivative of bulk modulus, total energies and density of states were also included. The elastic constants and mechanical properties such as Poissons ratio, Youngs modulus and shear modulus are estimated from the calculated elastic constants of the single crystal. Through the quasi-harmonic Debye model, the preasure and temperature dependences of the linear expansion coefficient, bulk modulus and heat capacity have been investigated. Finally, the Debye temperature has been estimated from the average sound velocity according to the predicted polycrystal bulk properties and from the single crystal elastic constants. (C) 2015 Elsevier Ltd. All rights reserved.",
journal = "Journal of Physics and Chemistry of Solids",
title = "Ab initio studies of the structural, elastic, electronic and thermal properties of NiTi2 intermetallic",
volume = "85",
pages = "197-205",
doi = "10.1016/j.jpcs.2015.05.019"
}

Toprek, D., Belošević-Čavor, J.,& Koteski, V. J.. (2015). Ab initio studies of the structural, elastic, electronic and thermal properties of NiTi2 intermetallic. in Journal of Physics and Chemistry of Solids, 85, 197-205.
https://doi.org/10.1016/j.jpcs.2015.05.019

Toprek D, Belošević-Čavor J, Koteski VJ. Ab initio studies of the structural, elastic, electronic and thermal properties of NiTi2 intermetallic. in Journal of Physics and Chemistry of Solids. 2015;85:197-205.
doi:10.1016/j.jpcs.2015.05.019 .

Toprek, Dragan, Belošević-Čavor, Jelena, Koteski, Vasil J., "Ab initio studies of the structural, elastic, electronic and thermal properties of NiTi2 intermetallic" in Journal of Physics and Chemistry of Solids, 85 (2015):197-205,
https://doi.org/10.1016/j.jpcs.2015.05.019 . .

TY  - JOUR
AU  - Koltunowicz, T. N.
AU  - Zukowski, P.
AU  - Milosavljević, Momir
AU  - Saad, A. M.
AU  - Kasiuk, J. V.
AU  - Fedotova, J. A.
AU  - Kalinin, Yu E.
AU  - Sitnikov, A. V.
AU  - Fedotov, A. K.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5788
AB  - The present paper investigates dependencies of DC/AC conductances on metallic-to-dielectric phase ratio x, temperature T and frequency f in granular nanocomposite films containing FeCoZr nanoparticles embedded into oxygen-free CaF2 matrix. The specific admittance/conductance dependences on x/T/f for the studied films around the percolation configuration was found to be in agreement with their phase structure which was strongly dependent on the composition of gas atmosphere at deposition. The character of temperature/frequency dependences of AC/DC conductance indicates the predominance of electron tunneling (hopping) over the barriers between metallic nanoparticles in carrier transport. (C) 2012 Elsevier B. V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - AC/DC conductance in granular nanocomposite films (Fe45Co45Zr10)(x)(CaF2)(100-x)
VL  - 586
SP  - S353
EP  - S356
DO  - 10.1016/j.jallcom.2012.09.121
ER  - 

@article{
author = "Koltunowicz, T. N. and Zukowski, P. and Milosavljević, Momir and Saad, A. M. and Kasiuk, J. V. and Fedotova, J. A. and Kalinin, Yu E. and Sitnikov, A. V. and Fedotov, A. K.",
year = "2014",
abstract = "The present paper investigates dependencies of DC/AC conductances on metallic-to-dielectric phase ratio x, temperature T and frequency f in granular nanocomposite films containing FeCoZr nanoparticles embedded into oxygen-free CaF2 matrix. The specific admittance/conductance dependences on x/T/f for the studied films around the percolation configuration was found to be in agreement with their phase structure which was strongly dependent on the composition of gas atmosphere at deposition. The character of temperature/frequency dependences of AC/DC conductance indicates the predominance of electron tunneling (hopping) over the barriers between metallic nanoparticles in carrier transport. (C) 2012 Elsevier B. V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "AC/DC conductance in granular nanocomposite films (Fe45Co45Zr10)(x)(CaF2)(100-x)",
volume = "586",
pages = "S353-S356",
doi = "10.1016/j.jallcom.2012.09.121"
}

Koltunowicz, T. N., Zukowski, P., Milosavljević, M., Saad, A. M., Kasiuk, J. V., Fedotova, J. A., Kalinin, Y. E., Sitnikov, A. V.,& Fedotov, A. K.. (2014). AC/DC conductance in granular nanocomposite films (Fe45Co45Zr10)(x)(CaF2)(100-x). in Journal of Alloys and Compounds, 586, S353-S356.
https://doi.org/10.1016/j.jallcom.2012.09.121

Koltunowicz TN, Zukowski P, Milosavljević M, Saad AM, Kasiuk JV, Fedotova JA, Kalinin YE, Sitnikov AV, Fedotov AK. AC/DC conductance in granular nanocomposite films (Fe45Co45Zr10)(x)(CaF2)(100-x). in Journal of Alloys and Compounds. 2014;586:S353-S356.
doi:10.1016/j.jallcom.2012.09.121 .

Koltunowicz, T. N., Zukowski, P., Milosavljević, Momir, Saad, A. M., Kasiuk, J. V., Fedotova, J. A., Kalinin, Yu E., Sitnikov, A. V., Fedotov, A. K., "AC/DC conductance in granular nanocomposite films (Fe45Co45Zr10)(x)(CaF2)(100-x)" in Journal of Alloys and Compounds, 586 (2014):S353-S356,
https://doi.org/10.1016/j.jallcom.2012.09.121 . .

TY  - JOUR
AU  - Kasiuk, J. V.
AU  - Fedotova, J. A.
AU  - Przewoznik, J.
AU  - Zukrowski, J.
AU  - Sikora, M.
AU  - Kapusta, Cz
AU  - Grce, Ana
AU  - Milosavljević, Momir
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/77
AB  - The relation between nanoscale structure, local atomic order and magnetic properties of (FeCoZr)(x)(CaF2)(100-x) (29 LT = x LT = 73 at. %) granular films is studied as a function of metal/insulator fraction ratio. The films of a thickness of 1-6 mu m were deposited on Al-foils and glass-ceramic substrates, by ion sputtering of targets of different metal/insulator contents. Structural characterization with X-ray and electron diffraction as well as transmission electron microscopy revealed that the films are composed of isolated nanocrystalline bcc alpha-FeCo(Zr) alloy and insulating fcc CaF2 matrix. They grow in a columnar structure, where elongated metallic nanograins are arranged on top of each other within the columns almost normal to the substrate surface. Mossbauer spectroscopy and magnetometry results indicate that their easy magnetization axes are oriented at an angle of 65 degrees-74 degrees to the surface in films with x between 46 and 74, above the electrical percolation threshold, which is attributed to the growth-induced shape anisotropy. Interatomic distances characteristic for metallic state of alpha-FeCo(Zr) nanograins were revealed by X-ray Absorption Spectroscopy. The results show a lack of surface oxidation of the alloy nanograins, so the growth-induced orientation of nanograins in the films cannot be attributed to this effect. The study is among the first to report a growth-induced non-planar magnetic anisotropy in metal/insulator granular films above the percolation threshold and to reveal the origin of it. (C) 2014 AIP Publishing LLC.
T2  - Journal of Applied Physics
T1  - Growth-induced non-planar magnetic anisotropy in FeCoZr-CaF2 nanogranular films: Structural and magnetic characterization
VL  - 116
IS  - 4
DO  - 10.1063/1.4891016
ER  - 

@article{
author = "Kasiuk, J. V. and Fedotova, J. A. and Przewoznik, J. and Zukrowski, J. and Sikora, M. and Kapusta, Cz and Grce, Ana and Milosavljević, Momir",
year = "2014",
abstract = "The relation between nanoscale structure, local atomic order and magnetic properties of (FeCoZr)(x)(CaF2)(100-x) (29 LT = x LT = 73 at. %) granular films is studied as a function of metal/insulator fraction ratio. The films of a thickness of 1-6 mu m were deposited on Al-foils and glass-ceramic substrates, by ion sputtering of targets of different metal/insulator contents. Structural characterization with X-ray and electron diffraction as well as transmission electron microscopy revealed that the films are composed of isolated nanocrystalline bcc alpha-FeCo(Zr) alloy and insulating fcc CaF2 matrix. They grow in a columnar structure, where elongated metallic nanograins are arranged on top of each other within the columns almost normal to the substrate surface. Mossbauer spectroscopy and magnetometry results indicate that their easy magnetization axes are oriented at an angle of 65 degrees-74 degrees to the surface in films with x between 46 and 74, above the electrical percolation threshold, which is attributed to the growth-induced shape anisotropy. Interatomic distances characteristic for metallic state of alpha-FeCo(Zr) nanograins were revealed by X-ray Absorption Spectroscopy. The results show a lack of surface oxidation of the alloy nanograins, so the growth-induced orientation of nanograins in the films cannot be attributed to this effect. The study is among the first to report a growth-induced non-planar magnetic anisotropy in metal/insulator granular films above the percolation threshold and to reveal the origin of it. (C) 2014 AIP Publishing LLC.",
journal = "Journal of Applied Physics",
title = "Growth-induced non-planar magnetic anisotropy in FeCoZr-CaF2 nanogranular films: Structural and magnetic characterization",
volume = "116",
number = "4",
doi = "10.1063/1.4891016"
}

Kasiuk, J. V., Fedotova, J. A., Przewoznik, J., Zukrowski, J., Sikora, M., Kapusta, C., Grce, A.,& Milosavljević, M.. (2014). Growth-induced non-planar magnetic anisotropy in FeCoZr-CaF2 nanogranular films: Structural and magnetic characterization. in Journal of Applied Physics, 116(4).
https://doi.org/10.1063/1.4891016

Kasiuk JV, Fedotova JA, Przewoznik J, Zukrowski J, Sikora M, Kapusta C, Grce A, Milosavljević M. Growth-induced non-planar magnetic anisotropy in FeCoZr-CaF2 nanogranular films: Structural and magnetic characterization. in Journal of Applied Physics. 2014;116(4).
doi:10.1063/1.4891016 .

Kasiuk, J. V., Fedotova, J. A., Przewoznik, J., Zukrowski, J., Sikora, M., Kapusta, Cz, Grce, Ana, Milosavljević, Momir, "Growth-induced non-planar magnetic anisotropy in FeCoZr-CaF2 nanogranular films: Structural and magnetic characterization" in Journal of Applied Physics, 116, no. 4 (2014),
https://doi.org/10.1063/1.4891016 . .

TY  - JOUR
AU  - Peruško, Davor
AU  - Cizmovic, M.
AU  - Petrović, Suzana
AU  - Siketic, Z.
AU  - Mitrić, Miodrag
AU  - Pelicon, P.
AU  - Dražić, Goran
AU  - Kovač, Janez
AU  - Milinović, Velimir
AU  - Milosavljević, Momir
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5457
AB  - Multilayered 5x(Al/Ti) structures, deposited on a Si substrate to a total thickness of 130 nm, were treated by unfocused Nd:YAG laser pulses (150 ps) with energies of 85 and 65 mJ. Irradiations were performed in air with 10, 50 and 100 successive laser pulses. Characterizations were done by using Rutherford backscattering spectrometry (RBS), elastic recoil detection analysis (ERDA), x-ray diffraction (XRD) and transmission electron microscopy (TEM). The results obtained show that laser irradiation, at either energy, induced almost full intermixing of deposited layers and formation of intermetallic compounds, but this was more pronounced for the applied laser pulses with a higher energy. The intermixed layer-silicon interface remains intact for all numbers of applied laser pulses and for both energies. The formation of an oxide layer on the sample surfaces was also observed, the thickness of which is greater for the higher laser beam energy.
T2  - Laser Physics
T1  - Laser irradiation of nano-metric Al/Ti multilayers
VL  - 23
IS  - 3
DO  - 10.1088/1054-660X/23/3/036005
ER  - 

@article{
author = "Peruško, Davor and Cizmovic, M. and Petrović, Suzana and Siketic, Z. and Mitrić, Miodrag and Pelicon, P. and Dražić, Goran and Kovač, Janez and Milinović, Velimir and Milosavljević, Momir",
year = "2013",
abstract = "Multilayered 5x(Al/Ti) structures, deposited on a Si substrate to a total thickness of 130 nm, were treated by unfocused Nd:YAG laser pulses (150 ps) with energies of 85 and 65 mJ. Irradiations were performed in air with 10, 50 and 100 successive laser pulses. Characterizations were done by using Rutherford backscattering spectrometry (RBS), elastic recoil detection analysis (ERDA), x-ray diffraction (XRD) and transmission electron microscopy (TEM). The results obtained show that laser irradiation, at either energy, induced almost full intermixing of deposited layers and formation of intermetallic compounds, but this was more pronounced for the applied laser pulses with a higher energy. The intermixed layer-silicon interface remains intact for all numbers of applied laser pulses and for both energies. The formation of an oxide layer on the sample surfaces was also observed, the thickness of which is greater for the higher laser beam energy.",
journal = "Laser Physics",
title = "Laser irradiation of nano-metric Al/Ti multilayers",
volume = "23",
number = "3",
doi = "10.1088/1054-660X/23/3/036005"
}

Peruško, D., Cizmovic, M., Petrović, S., Siketic, Z., Mitrić, M., Pelicon, P., Dražić, G., Kovač, J., Milinović, V.,& Milosavljević, M.. (2013). Laser irradiation of nano-metric Al/Ti multilayers. in Laser Physics, 23(3).
https://doi.org/10.1088/1054-660X/23/3/036005

Peruško D, Cizmovic M, Petrović S, Siketic Z, Mitrić M, Pelicon P, Dražić G, Kovač J, Milinović V, Milosavljević M. Laser irradiation of nano-metric Al/Ti multilayers. in Laser Physics. 2013;23(3).
doi:10.1088/1054-660X/23/3/036005 .

Peruško, Davor, Cizmovic, M., Petrović, Suzana, Siketic, Z., Mitrić, Miodrag, Pelicon, P., Dražić, Goran, Kovač, Janez, Milinović, Velimir, Milosavljević, Momir, "Laser irradiation of nano-metric Al/Ti multilayers" in Laser Physics, 23, no. 3 (2013),
https://doi.org/10.1088/1054-660X/23/3/036005 . .

TY  - JOUR
AU  - Cizmovic, M.
AU  - Kovač, Janez
AU  - Milosavljević, Momir
AU  - Petrović, Suzana
AU  - Dražić, Goran
AU  - Mitrić, Miodrag
AU  - Obradović, Marko O.
AU  - Schaaf, P.
AU  - Peruško, Davor
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7016
AB  - Structural and compositional modifications of multilayered Al/Ti nano-structures induced by nanosecond laser pulses were investigated. Five and ten (Al/Ti) bilayers, with total thicknesses of 130 and 260 nm, respectively, were deposited by dc ion sputtering onto (100) Si wafers. The structures were irradiated in air with nanosecond Nd:YAG unfocused laser pulses. Characterizations of the samples were performed by x-ray diffraction analysis, Auger electron spectroscopy, atomic force microscopy and transmission electron microscopy. It was found that laser treatment of both structures induced complete intermixing of all deposited metallic films, their mixing with silicon substrate and formation of Al-Ti intermetallic and silicide compounds. This effect was achieved even for one applied laser pulse. Comparing these results with that for picosecond laser treatment of similar multilayered structures, it was concluded that materials involved within the heat diffusion length participated in the formation of new phases.
T2  - Physica Scripta
T1  - Intermixing in Al/Ti multilayer structures induced by nanosecond laser pulses
VL  - T157
DO  - 10.1088/0031-8949/2013/T157/014008
ER  - 

@article{
author = "Cizmovic, M. and Kovač, Janez and Milosavljević, Momir and Petrović, Suzana and Dražić, Goran and Mitrić, Miodrag and Obradović, Marko O. and Schaaf, P. and Peruško, Davor",
year = "2013",
abstract = "Structural and compositional modifications of multilayered Al/Ti nano-structures induced by nanosecond laser pulses were investigated. Five and ten (Al/Ti) bilayers, with total thicknesses of 130 and 260 nm, respectively, were deposited by dc ion sputtering onto (100) Si wafers. The structures were irradiated in air with nanosecond Nd:YAG unfocused laser pulses. Characterizations of the samples were performed by x-ray diffraction analysis, Auger electron spectroscopy, atomic force microscopy and transmission electron microscopy. It was found that laser treatment of both structures induced complete intermixing of all deposited metallic films, their mixing with silicon substrate and formation of Al-Ti intermetallic and silicide compounds. This effect was achieved even for one applied laser pulse. Comparing these results with that for picosecond laser treatment of similar multilayered structures, it was concluded that materials involved within the heat diffusion length participated in the formation of new phases.",
journal = "Physica Scripta",
title = "Intermixing in Al/Ti multilayer structures induced by nanosecond laser pulses",
volume = "T157",
doi = "10.1088/0031-8949/2013/T157/014008"
}

Cizmovic, M., Kovač, J., Milosavljević, M., Petrović, S., Dražić, G., Mitrić, M., Obradović, M. O., Schaaf, P.,& Peruško, D.. (2013). Intermixing in Al/Ti multilayer structures induced by nanosecond laser pulses. in Physica Scripta, T157.
https://doi.org/10.1088/0031-8949/2013/T157/014008

Cizmovic M, Kovač J, Milosavljević M, Petrović S, Dražić G, Mitrić M, Obradović MO, Schaaf P, Peruško D. Intermixing in Al/Ti multilayer structures induced by nanosecond laser pulses. in Physica Scripta. 2013;T157.
doi:10.1088/0031-8949/2013/T157/014008 .

Cizmovic, M., Kovač, Janez, Milosavljević, Momir, Petrović, Suzana, Dražić, Goran, Mitrić, Miodrag, Obradović, Marko O., Schaaf, P., Peruško, Davor, "Intermixing in Al/Ti multilayer structures induced by nanosecond laser pulses" in Physica Scripta, T157 (2013),
https://doi.org/10.1088/0031-8949/2013/T157/014008 . .

TY  - JOUR
AU  - Milosavljević, Momir
AU  - Obradović, Marko O.
AU  - Grce, Ana
AU  - Peruško, Davor
AU  - Pjević, Dejan J.
AU  - Kovač, Janez
AU  - Dražić, Goran
AU  - Jeynes, Chris
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7006
AB  - The effects of high dose Ar ion irradiation on immiscible AlN/TiN multilayered structures were studied. The structures with 30 alternate layers of a total thickness of similar to 260 nm were deposited by reactive sputtering on (100) Si wafers. Individual layer thickness was similar to 8 nm AlN and similar to 9.3 nm TiN. Irradiation was done with 180 keV Ar+ ions to 1x10(16)-8x10(16) ions/cm(2), with the projected range around mid-depth of the structures. It was found that the highest applied dose induced a considerable intermixing, where the growing TiN grains consume the adjacent AlN layers, transforming partly to (TiAl)N phase. Intermixing occurs due to a high contribution of collision cascades, which was not compensated in demixing by chemical driving forces. However, a multilayered structure with relatively flat surface and interfaces is still preserved, with measured nano-hardness value above the level for the as-deposited sample. The results are compared to other systems and discussed in the light of the existing ion beam mixing models. They can be interesting towards better understanding of the processes involved and to development of radiation tolerant coatings. (C) 2013 Elsevier B.V. All rights reserved.
T2  - Thin Solid Films
T1  - High dose ion irradiation effects on immiscible AlN/TiN nano-scaled multilayers
VL  - 544
SP  - 562
EP  - 566
DO  - 10.1016/j.tsf.2012.12.068
ER  - 

@article{
author = "Milosavljević, Momir and Obradović, Marko O. and Grce, Ana and Peruško, Davor and Pjević, Dejan J. and Kovač, Janez and Dražić, Goran and Jeynes, Chris",
year = "2013",
abstract = "The effects of high dose Ar ion irradiation on immiscible AlN/TiN multilayered structures were studied. The structures with 30 alternate layers of a total thickness of similar to 260 nm were deposited by reactive sputtering on (100) Si wafers. Individual layer thickness was similar to 8 nm AlN and similar to 9.3 nm TiN. Irradiation was done with 180 keV Ar+ ions to 1x10(16)-8x10(16) ions/cm(2), with the projected range around mid-depth of the structures. It was found that the highest applied dose induced a considerable intermixing, where the growing TiN grains consume the adjacent AlN layers, transforming partly to (TiAl)N phase. Intermixing occurs due to a high contribution of collision cascades, which was not compensated in demixing by chemical driving forces. However, a multilayered structure with relatively flat surface and interfaces is still preserved, with measured nano-hardness value above the level for the as-deposited sample. The results are compared to other systems and discussed in the light of the existing ion beam mixing models. They can be interesting towards better understanding of the processes involved and to development of radiation tolerant coatings. (C) 2013 Elsevier B.V. All rights reserved.",
journal = "Thin Solid Films",
title = "High dose ion irradiation effects on immiscible AlN/TiN nano-scaled multilayers",
volume = "544",
pages = "562-566",
doi = "10.1016/j.tsf.2012.12.068"
}

Milosavljević, M., Obradović, M. O., Grce, A., Peruško, D., Pjević, D. J., Kovač, J., Dražić, G.,& Jeynes, C.. (2013). High dose ion irradiation effects on immiscible AlN/TiN nano-scaled multilayers. in Thin Solid Films, 544, 562-566.
https://doi.org/10.1016/j.tsf.2012.12.068

Milosavljević M, Obradović MO, Grce A, Peruško D, Pjević DJ, Kovač J, Dražić G, Jeynes C. High dose ion irradiation effects on immiscible AlN/TiN nano-scaled multilayers. in Thin Solid Films. 2013;544:562-566.
doi:10.1016/j.tsf.2012.12.068 .

Milosavljević, Momir, Obradović, Marko O., Grce, Ana, Peruško, Davor, Pjević, Dejan J., Kovač, Janez, Dražić, Goran, Jeynes, Chris, "High dose ion irradiation effects on immiscible AlN/TiN nano-scaled multilayers" in Thin Solid Films, 544 (2013):562-566,
https://doi.org/10.1016/j.tsf.2012.12.068 . .