TY  - CONF
AU  - Rosić, Milena
AU  - Čebela, Maria
AU  - Labus, Nebojša
AU  - Radović, Marko
AU  - Aškrabić, Sonja
AU  - Dohčević-Mitrović, Zorana
AU  - Stojmenović, Marija
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11482
AB  - Ca1-xGdxMnO3 (x = 0.05–0.20) nanostructured perovskites were successfully synthesized by modified glycine nitrate procedure (MGNP). Temperature intervals of sintering and phase transition during heating were revealed during dilatometric measurements. In order to determine the band gap values of the tested samples, ellipsometric measurements were performed in the UV-VIS spectral range. Decrease of band gap values with increase of Gd dopant content was attributed to n-type doping and upward shifting of the Fermi level in the conduction band. The investigation of the crystal structure and phase content of nanocrystalline Ca1- xGdxMnO3 powders was continued using micro-Raman spectroscopy. The electrical conductivity of Gd3+ doped sintered samples CaMnO3 as a function of temperature was measured by electrochemical impedance spectroscopy (EIS), in the temperature range of 400–700 °C. The corresponding activation energies of conductivity, measured in the investigated temperature range, were also discussed. The obtained research results showed that the highest hardness values of 7.58 GPa respectively, were achieved and that these nanostructured materials can be used as a high-density ceramic material for various industrial applications.
PB  - Belgrade : Institute for Multidisciplinary Research
C3  - Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade, Serbia
T1  - Influence of Gd-doping on electrical properties in Ca1-xGdxMnO3 (x=0.05, 0.1, 0.15, 0.2) perovskites
SP  - 119
EP  - 119
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11482
ER  - 

@conference{
author = "Rosić, Milena and Čebela, Maria and Labus, Nebojša and Radović, Marko and Aškrabić, Sonja and Dohčević-Mitrović, Zorana and Stojmenović, Marija",
year = "2023",
abstract = "Ca1-xGdxMnO3 (x = 0.05–0.20) nanostructured perovskites were successfully synthesized by modified glycine nitrate procedure (MGNP). Temperature intervals of sintering and phase transition during heating were revealed during dilatometric measurements. In order to determine the band gap values of the tested samples, ellipsometric measurements were performed in the UV-VIS spectral range. Decrease of band gap values with increase of Gd dopant content was attributed to n-type doping and upward shifting of the Fermi level in the conduction band. The investigation of the crystal structure and phase content of nanocrystalline Ca1- xGdxMnO3 powders was continued using micro-Raman spectroscopy. The electrical conductivity of Gd3+ doped sintered samples CaMnO3 as a function of temperature was measured by electrochemical impedance spectroscopy (EIS), in the temperature range of 400–700 °C. The corresponding activation energies of conductivity, measured in the investigated temperature range, were also discussed. The obtained research results showed that the highest hardness values of 7.58 GPa respectively, were achieved and that these nanostructured materials can be used as a high-density ceramic material for various industrial applications.",
publisher = "Belgrade : Institute for Multidisciplinary Research",
journal = "Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade, Serbia",
title = "Influence of Gd-doping on electrical properties in Ca1-xGdxMnO3 (x=0.05, 0.1, 0.15, 0.2) perovskites",
pages = "119-119",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11482"
}

Rosić, M., Čebela, M., Labus, N., Radović, M., Aškrabić, S., Dohčević-Mitrović, Z.,& Stojmenović, M.. (2023). Influence of Gd-doping on electrical properties in Ca1-xGdxMnO3 (x=0.05, 0.1, 0.15, 0.2) perovskites. in Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade, Serbia
Belgrade : Institute for Multidisciplinary Research., 119-119.
https://hdl.handle.net/21.15107/rcub_vinar_11482

Rosić M, Čebela M, Labus N, Radović M, Aškrabić S, Dohčević-Mitrović Z, Stojmenović M. Influence of Gd-doping on electrical properties in Ca1-xGdxMnO3 (x=0.05, 0.1, 0.15, 0.2) perovskites. in Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade, Serbia. 2023;:119-119.
https://hdl.handle.net/21.15107/rcub_vinar_11482 .

Rosić, Milena, Čebela, Maria, Labus, Nebojša, Radović, Marko, Aškrabić, Sonja, Dohčević-Mitrović, Zorana, Stojmenović, Marija, "Influence of Gd-doping on electrical properties in Ca1-xGdxMnO3 (x=0.05, 0.1, 0.15, 0.2) perovskites" in Programme and the Book of Abstracts / 7th Conference of The Serbian Society for Ceramic Materials, 7CSCS-2023, June 14-16, 2023 Belgrade, Serbia (2023):119-119,
https://hdl.handle.net/21.15107/rcub_vinar_11482 .

TY  - JOUR
AU  - Miletić, Mirjana
AU  - Vilotić, Aleksandra
AU  - Korićanac, Lela
AU  - Žakula, Jelena
AU  - Jovanović Krivokuća, Milica
AU  - Dohčević-Mitrović, Zorana
AU  - Aškrabić, Sonja
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10542
AB  - Selective cytotoxicity of ZnO nanoparticles among different cell types and cancer and non-cancerous cells has been demonstrated earlier. In the view of anticancer potential of ZnO nanoparticles and their presence in numerous industrial products, it is of great importance to carefully evaluate their effects and mechanisms of action in both cancerous and healthy cells. In this paper, the effects of ZnO nanoparticles on cancerous HeLa and non-cancerous MRC-5 cells are investigated by studying the changes in the vibrational properties of the cells using Raman spectroscopy. Both types of cells were incubated with ZnO nanoparticles of average size 40 nm in the doses from the range 10–40 µg/ml for the period of 48 h, after which Raman spectra were collected. Raman modes’ intensity ratios I1659/I1444, I2855/I2933 and I1337/I1305 were determined as spectral markers of the cytotoxic effect of ZnO in both cell types. Non-negative principal component analysis was used instead of standard one for analysis and detection of spectral features characteristic for nanoparticle-treated cells. The first several non-negative loading vectors obtained in this analysis coincided remarkably well with the Raman spectra of particular biomolecules, showing increase of lipid and decrease of nucleic acids and protein content. Our study pointed out that Raman spectral markers of lipid unsaturation, especially I1270/I1300, are relevant for tracing the cytotoxic effect of ZnO nanoparticles on both cancerous and non-cancerous cells. The change of these spectral markers is correlated to the dose of applied nanoparticles and to the degree of cellular damage. Furthermore, great similarity of spectral features of increasing lipids to spectral features of phosphatidylserine, one of the main apoptotic markers, was recognized in treated cells. Finally, the results strongly indicated that the degree of lipid saturation, presented in the cells, plays an important role in the interaction of cells with nanoparticles.
T2  - Spectrochimica Acta. Part A: Molecular and Biomolecular Spectroscopy
T1  - Spectroscopic signature of ZnO NP-induced cell death modalities assessed by non-negative PCA
VL  - 288
SP  - 122180
DO  - 10.1016/j.saa.2022.122180
ER  - 

@article{
author = "Miletić, Mirjana and Vilotić, Aleksandra and Korićanac, Lela and Žakula, Jelena and Jovanović Krivokuća, Milica and Dohčević-Mitrović, Zorana and Aškrabić, Sonja",
year = "2023",
abstract = "Selective cytotoxicity of ZnO nanoparticles among different cell types and cancer and non-cancerous cells has been demonstrated earlier. In the view of anticancer potential of ZnO nanoparticles and their presence in numerous industrial products, it is of great importance to carefully evaluate their effects and mechanisms of action in both cancerous and healthy cells. In this paper, the effects of ZnO nanoparticles on cancerous HeLa and non-cancerous MRC-5 cells are investigated by studying the changes in the vibrational properties of the cells using Raman spectroscopy. Both types of cells were incubated with ZnO nanoparticles of average size 40 nm in the doses from the range 10–40 µg/ml for the period of 48 h, after which Raman spectra were collected. Raman modes’ intensity ratios I1659/I1444, I2855/I2933 and I1337/I1305 were determined as spectral markers of the cytotoxic effect of ZnO in both cell types. Non-negative principal component analysis was used instead of standard one for analysis and detection of spectral features characteristic for nanoparticle-treated cells. The first several non-negative loading vectors obtained in this analysis coincided remarkably well with the Raman spectra of particular biomolecules, showing increase of lipid and decrease of nucleic acids and protein content. Our study pointed out that Raman spectral markers of lipid unsaturation, especially I1270/I1300, are relevant for tracing the cytotoxic effect of ZnO nanoparticles on both cancerous and non-cancerous cells. The change of these spectral markers is correlated to the dose of applied nanoparticles and to the degree of cellular damage. Furthermore, great similarity of spectral features of increasing lipids to spectral features of phosphatidylserine, one of the main apoptotic markers, was recognized in treated cells. Finally, the results strongly indicated that the degree of lipid saturation, presented in the cells, plays an important role in the interaction of cells with nanoparticles.",
journal = "Spectrochimica Acta. Part A: Molecular and Biomolecular Spectroscopy",
title = "Spectroscopic signature of ZnO NP-induced cell death modalities assessed by non-negative PCA",
volume = "288",
pages = "122180",
doi = "10.1016/j.saa.2022.122180"
}

Miletić, M., Vilotić, A., Korićanac, L., Žakula, J., Jovanović Krivokuća, M., Dohčević-Mitrović, Z.,& Aškrabić, S.. (2023). Spectroscopic signature of ZnO NP-induced cell death modalities assessed by non-negative PCA. in Spectrochimica Acta. Part A: Molecular and Biomolecular Spectroscopy, 288, 122180.
https://doi.org/10.1016/j.saa.2022.122180

Miletić M, Vilotić A, Korićanac L, Žakula J, Jovanović Krivokuća M, Dohčević-Mitrović Z, Aškrabić S. Spectroscopic signature of ZnO NP-induced cell death modalities assessed by non-negative PCA. in Spectrochimica Acta. Part A: Molecular and Biomolecular Spectroscopy. 2023;288:122180.
doi:10.1016/j.saa.2022.122180 .

Miletić, Mirjana, Vilotić, Aleksandra, Korićanac, Lela, Žakula, Jelena, Jovanović Krivokuća, Milica, Dohčević-Mitrović, Zorana, Aškrabić, Sonja, "Spectroscopic signature of ZnO NP-induced cell death modalities assessed by non-negative PCA" in Spectrochimica Acta. Part A: Molecular and Biomolecular Spectroscopy, 288 (2023):122180,
https://doi.org/10.1016/j.saa.2022.122180 . .

TY  - JOUR
AU  - Stojadinović, Bojan
AU  - Đokić, Dejan M.
AU  - Paunović, Novica
AU  - Živković, Ivica
AU  - Ćirić, Luka
AU  - Kusigerski, Vladan
AU  - Dohčević-Mitrović, Zorana
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9956
AB  - We report on temperature dependence of two-phonon Raman spectra in BiFeO3 nanocrystals, above and below the Néel temperature TN using a resonant laser excitation line (λ=532 nm). Two-phonon modes exhibited anomalous frequency hardening and deviation from the anharmonic decay below TN. Such behavior strongly supported the existence of spin-two-phonon interaction, because these modes are known to be very sensitive to the antiferromagnetic ordering. Within the mean-field theory for the nearest-neighbor interaction, the linear relationship between spin–spin correlation function and observed two-phonon frequency shift below TN was obtained. This approach enabled to quantify the spin–phonon interaction by spin–phonon coupling strength for both two-phonon modes and justified the application of mean-field approach. Magnetic measurements revealed the coexistence of antiferromagnetic and weak ferromagnetic phases below TN, which were found non competitive, additionally supporting the mean-field approach from which we deduced that the two-phonon modes in BiFeO3 are correlated with antiferromagnetic ordering below TN.
T2  - Materials Science and Engineering: B
T1  - Unvailing the spin–phonon coupling in nanocrystalline BiFeO3 by resonant two-phonon Raman active modes
VL  - 274
SP  - 115444
DO  - 10.1016/j.mseb.2021.115444
ER  - 

@article{
author = "Stojadinović, Bojan and Đokić, Dejan M. and Paunović, Novica and Živković, Ivica and Ćirić, Luka and Kusigerski, Vladan and Dohčević-Mitrović, Zorana",
year = "2021",
abstract = "We report on temperature dependence of two-phonon Raman spectra in BiFeO3 nanocrystals, above and below the Néel temperature TN using a resonant laser excitation line (λ=532 nm). Two-phonon modes exhibited anomalous frequency hardening and deviation from the anharmonic decay below TN. Such behavior strongly supported the existence of spin-two-phonon interaction, because these modes are known to be very sensitive to the antiferromagnetic ordering. Within the mean-field theory for the nearest-neighbor interaction, the linear relationship between spin–spin correlation function and observed two-phonon frequency shift below TN was obtained. This approach enabled to quantify the spin–phonon interaction by spin–phonon coupling strength for both two-phonon modes and justified the application of mean-field approach. Magnetic measurements revealed the coexistence of antiferromagnetic and weak ferromagnetic phases below TN, which were found non competitive, additionally supporting the mean-field approach from which we deduced that the two-phonon modes in BiFeO3 are correlated with antiferromagnetic ordering below TN.",
journal = "Materials Science and Engineering: B",
title = "Unvailing the spin–phonon coupling in nanocrystalline BiFeO3 by resonant two-phonon Raman active modes",
volume = "274",
pages = "115444",
doi = "10.1016/j.mseb.2021.115444"
}

Stojadinović, B., Đokić, D. M., Paunović, N., Živković, I., Ćirić, L., Kusigerski, V.,& Dohčević-Mitrović, Z.. (2021). Unvailing the spin–phonon coupling in nanocrystalline BiFeO3 by resonant two-phonon Raman active modes. in Materials Science and Engineering: B, 274, 115444.
https://doi.org/10.1016/j.mseb.2021.115444

Stojadinović B, Đokić DM, Paunović N, Živković I, Ćirić L, Kusigerski V, Dohčević-Mitrović Z. Unvailing the spin–phonon coupling in nanocrystalline BiFeO3 by resonant two-phonon Raman active modes. in Materials Science and Engineering: B. 2021;274:115444.
doi:10.1016/j.mseb.2021.115444 .

Stojadinović, Bojan, Đokić, Dejan M., Paunović, Novica, Živković, Ivica, Ćirić, Luka, Kusigerski, Vladan, Dohčević-Mitrović, Zorana, "Unvailing the spin–phonon coupling in nanocrystalline BiFeO3 by resonant two-phonon Raman active modes" in Materials Science and Engineering: B, 274 (2021):115444,
https://doi.org/10.1016/j.mseb.2021.115444 . .

TY  - CONF
AU  - Miletić, M.
AU  - Aškrabić, S.
AU  - Schie, I.
AU  - Rüger, J.
AU  - Korićanac, Lela
AU  - Mondol, A. S.
AU  - Vasić, Borislav
AU  - Dohčević-Mitrović, Zorana
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11881
AB  - Study of the interaction between nanoparticles and human cells is usually performed using customized biochemical assays that mostly offer measurements of a single quantity/property and use labels. Raman spectroscopy on the other hand offers integral insight into complex information on biomolecular composition and molecule conformation inside cells by measuring vibrational spectra from the entire cell [1]. Furthermore, it does not require dyes nor other labels and sample preparation is very simple, which reduces time consumation and possibility of cell damage during preparation. Cerium-dioxide (CeO2) nanoparticles are known for their controversial dual activity in numerous studied cancer cell lines: while protecting some cell types from oxidative damage, their cytotoxic effect in other cell lines is also reported [2, 3]. Here, effects of two types of CeO2 nanoparticles: uncoated and dextran-coated, were studied in HeLa cells, a cervical carcinoma derived cell line. Nanoparticle-treated cells were probed by routinely used biological assays for cell growth and viability, based on dying with Sulforhodamine B and Trypan Blue, respectively [3]. The tests have shown that the nanoparticles have more prominent effect on cell growth than on viability. In the light of this information Raman spectroscopy was employed in order to investigate the changes in biomolecular content of the cervical cancer cells after treatment with nanoparticles and find connection between these changes and the resulting cell status. Raman spectra of nanoparticletreated and control (untreated) cells were obtained using 532 nm laser line as an excitation probe. From each experimental group, at least 250 cell spectra were measured. Principal component analysis (PCA) covering the spectral regions (700-1800) cm-1 and (2800-3200) cm-1 has extracted the differences between vibrational spectra features of nanoparticle-treated and control cells, but also between spectra of cells treated with uncoated and coated CeO2 nanoparticles. These changes have been associated with induced alterations of prominent groups of biomolecules, DNA, lipids and proteins. Reduced total DNA content and/or breaking of O-P-O bonds leads to the decreased vibrational intensity of 785 cm-1 peak which differentiates to a large degree treated and control cells. Amide I vibrational band (1600-1670) cm-1 , characteristic for peptide bonds and modulated by proteins secondary structure, differentiates between cells treated with coated and uncoated nanoparticles. Correlation of the spectral information with the results of biological assays was performed.
PB  - Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade
C3  - PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
T1  - Effects of cerium-dioxide nanoparticles in cervical cancer cells studied by Raman spectroscopy
SP  - 132
EP  - 132
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11881
ER  - 

@conference{
author = "Miletić, M. and Aškrabić, S. and Schie, I. and Rüger, J. and Korićanac, Lela and Mondol, A. S. and Vasić, Borislav and Dohčević-Mitrović, Zorana",
year = "2019",
abstract = "Study of the interaction between nanoparticles and human cells is usually performed using customized biochemical assays that mostly offer measurements of a single quantity/property and use labels. Raman spectroscopy on the other hand offers integral insight into complex information on biomolecular composition and molecule conformation inside cells by measuring vibrational spectra from the entire cell [1]. Furthermore, it does not require dyes nor other labels and sample preparation is very simple, which reduces time consumation and possibility of cell damage during preparation. Cerium-dioxide (CeO2) nanoparticles are known for their controversial dual activity in numerous studied cancer cell lines: while protecting some cell types from oxidative damage, their cytotoxic effect in other cell lines is also reported [2, 3]. Here, effects of two types of CeO2 nanoparticles: uncoated and dextran-coated, were studied in HeLa cells, a cervical carcinoma derived cell line. Nanoparticle-treated cells were probed by routinely used biological assays for cell growth and viability, based on dying with Sulforhodamine B and Trypan Blue, respectively [3]. The tests have shown that the nanoparticles have more prominent effect on cell growth than on viability. In the light of this information Raman spectroscopy was employed in order to investigate the changes in biomolecular content of the cervical cancer cells after treatment with nanoparticles and find connection between these changes and the resulting cell status. Raman spectra of nanoparticletreated and control (untreated) cells were obtained using 532 nm laser line as an excitation probe. From each experimental group, at least 250 cell spectra were measured. Principal component analysis (PCA) covering the spectral regions (700-1800) cm-1 and (2800-3200) cm-1 has extracted the differences between vibrational spectra features of nanoparticle-treated and control cells, but also between spectra of cells treated with uncoated and coated CeO2 nanoparticles. These changes have been associated with induced alterations of prominent groups of biomolecules, DNA, lipids and proteins. Reduced total DNA content and/or breaking of O-P-O bonds leads to the decreased vibrational intensity of 785 cm-1 peak which differentiates to a large degree treated and control cells. Amide I vibrational band (1600-1670) cm-1 , characteristic for peptide bonds and modulated by proteins secondary structure, differentiates between cells treated with coated and uncoated nanoparticles. Correlation of the spectral information with the results of biological assays was performed.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade",
journal = "PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts",
title = "Effects of cerium-dioxide nanoparticles in cervical cancer cells studied by Raman spectroscopy",
pages = "132-132",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11881"
}

Miletić, M., Aškrabić, S., Schie, I., Rüger, J., Korićanac, L., Mondol, A. S., Vasić, B.,& Dohčević-Mitrović, Z.. (2019). Effects of cerium-dioxide nanoparticles in cervical cancer cells studied by Raman spectroscopy. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts
Belgrade : Vinča Institute of Nuclear Sciences, University of Belgrade., 132-132.
https://hdl.handle.net/21.15107/rcub_vinar_11881

Miletić M, Aškrabić S, Schie I, Rüger J, Korićanac L, Mondol AS, Vasić B, Dohčević-Mitrović Z. Effects of cerium-dioxide nanoparticles in cervical cancer cells studied by Raman spectroscopy. in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts. 2019;:132-132.
https://hdl.handle.net/21.15107/rcub_vinar_11881 .

Miletić, M., Aškrabić, S., Schie, I., Rüger, J., Korićanac, Lela, Mondol, A. S., Vasić, Borislav, Dohčević-Mitrović, Zorana, "Effects of cerium-dioxide nanoparticles in cervical cancer cells studied by Raman spectroscopy" in PHOTONICA2019 : 7th International School and Conference on Photonics & Machine Learning with Photonics Symposium : Book of abstracts (2019):132-132,
https://hdl.handle.net/21.15107/rcub_vinar_11881 .

TY  - JOUR
AU  - Stojadinović, Bojan
AU  - Dohčević-Mitrović, Zorana 
AU  - Stepanenko, Dimitrije
AU  - Rosić, Milena
AU  - Petronijević, Ivan M.
AU  - Tasić, Nikola B.
AU  - Ilić, Nikola
AU  - Matović, Branko
AU  - Stojanovic, Biljana
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1804
AB  - We have studied Ho-doped BiFeO3 nanopowders (Bi1-xHoxFeO3, x = 0-0.15), prepared via sol-gel method, in order to analyse the effect of substitution-driven structural transition on dielectric and ferroelectric properties of bismuth ferrite. X-ray diffraction and Raman study demonstrated that an increased Ho concentration (x GT = 0.1) has induced gradual phase transition from rhombohedral to orthorhombic phase. The frequency dependent permittivity of Bi1-xHoxFeO3 nanopowders was analysed within a model which incorporates Debye-like dielectric response and dc and ac conductivity contributions based on universal dielectric response. It was shown that influence of leakage current and grain boundary/interface effects on dielectric and ferroelectric properties was substantially reduced in biphasic Bi1-xHoxFeO3 (x GT 0.1) samples. The electrical performance of Bi0.85Ho0.15FeO3 sample, for which orthorhombic phase prevailed, was significantly improved and Bi0.85Ho0.15FeO3 has sustained strong applied electric fields (up to 100 kV/cm) without breakdown. Under strong external fields, the polarization exhibited strong frequency dependence. The low-frequency remnant polarization and coercive field of Bi0.85Ho0.15FeO3 were significantly enhanced. It was proposed that defect dipolar polarization substantially contributed to the intrinsic polarization of Bi0.85Ho0.15FeO3 under strong electric fields at low frequencies.
T2  - Ceramics International
T1  - Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition
VL  - 43
IS  - 18
SP  - 16531
EP  - 16538
DO  - 10.1016/j.ceramint.2017.09.038
ER  - 

@article{
author = "Stojadinović, Bojan and Dohčević-Mitrović, Zorana  and Stepanenko, Dimitrije and Rosić, Milena and Petronijević, Ivan M. and Tasić, Nikola B. and Ilić, Nikola and Matović, Branko and Stojanovic, Biljana",
year = "2017",
abstract = "We have studied Ho-doped BiFeO3 nanopowders (Bi1-xHoxFeO3, x = 0-0.15), prepared via sol-gel method, in order to analyse the effect of substitution-driven structural transition on dielectric and ferroelectric properties of bismuth ferrite. X-ray diffraction and Raman study demonstrated that an increased Ho concentration (x GT = 0.1) has induced gradual phase transition from rhombohedral to orthorhombic phase. The frequency dependent permittivity of Bi1-xHoxFeO3 nanopowders was analysed within a model which incorporates Debye-like dielectric response and dc and ac conductivity contributions based on universal dielectric response. It was shown that influence of leakage current and grain boundary/interface effects on dielectric and ferroelectric properties was substantially reduced in biphasic Bi1-xHoxFeO3 (x GT 0.1) samples. The electrical performance of Bi0.85Ho0.15FeO3 sample, for which orthorhombic phase prevailed, was significantly improved and Bi0.85Ho0.15FeO3 has sustained strong applied electric fields (up to 100 kV/cm) without breakdown. Under strong external fields, the polarization exhibited strong frequency dependence. The low-frequency remnant polarization and coercive field of Bi0.85Ho0.15FeO3 were significantly enhanced. It was proposed that defect dipolar polarization substantially contributed to the intrinsic polarization of Bi0.85Ho0.15FeO3 under strong electric fields at low frequencies.",
journal = "Ceramics International",
title = "Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition",
volume = "43",
number = "18",
pages = "16531-16538",
doi = "10.1016/j.ceramint.2017.09.038"
}

Stojadinović, B., Dohčević-Mitrović, Z., Stepanenko, D., Rosić, M., Petronijević, I. M., Tasić, N. B., Ilić, N., Matović, B.,& Stojanovic, B.. (2017). Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition. in Ceramics International, 43(18), 16531-16538.
https://doi.org/10.1016/j.ceramint.2017.09.038

Stojadinović B, Dohčević-Mitrović Z, Stepanenko D, Rosić M, Petronijević IM, Tasić NB, Ilić N, Matović B, Stojanovic B. Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition. in Ceramics International. 2017;43(18):16531-16538.
doi:10.1016/j.ceramint.2017.09.038 .

Stojadinović, Bojan, Dohčević-Mitrović, Zorana , Stepanenko, Dimitrije, Rosić, Milena, Petronijević, Ivan M., Tasić, Nikola B., Ilić, Nikola, Matović, Branko, Stojanovic, Biljana, "Dielectric and ferroelectric properties of Ho-doped BiFeO3 nanopowders across the structural phase transition" in Ceramics International, 43, no. 18 (2017):16531-16538,
https://doi.org/10.1016/j.ceramint.2017.09.038 . .

TY  - JOUR
AU  - Matović, Branko
AU  - Luković, Jelena M.
AU  - Stojadinović, Bojan
AU  - Aškrabić, Sonja
AU  - Zarubica, Aleksandra R.
AU  - Babić, Biljana M.
AU  - Dohčević-Mitrović, Zorana 
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1905
AB  - Nanosized Mg-doped ceria powders were obtained by self-propagating room temperature reaction without using surfactants or templates. X-ray diffraction analysis and field emission scanning microscopy results showed that the doped samples are solid solutions with fluorite-type structure and spherical morphology. Raman spectra revealed an increase in the amount of oxygen vacancies with the increase of Mg concentration. This increasing results in a narrowing of the bandgap of CeO2. The photocatalytic performances of the Mg-doped ceria solid solutions were evaluated by decomposing an organic dye, crystal violet under UV irradiation. The Mg-doped ceria solid solutions exhibit significantly better photocatalytic activity than the pure CeO2 and commercial TiO2. The higher first rate constant of the Mg-doped samples demonstrated that they are much more efficient than TiO2 and CeO2 under UV light. Mg2+ dopant ions and oxygen vacancies play a significant role in the enhancement of photocatalytic performances of the Mg-doped ceria.
T2  - Processing and Application of Ceramics
T1  - Influence of Mg doping on structural, optical and photocatalytic performances of ceria nanopowders
VL  - 11
IS  - 4
SP  - 304
EP  - 310
DO  - 10.2298/PAC1704304M
ER  - 

@article{
author = "Matović, Branko and Luković, Jelena M. and Stojadinović, Bojan and Aškrabić, Sonja and Zarubica, Aleksandra R. and Babić, Biljana M. and Dohčević-Mitrović, Zorana ",
year = "2017",
abstract = "Nanosized Mg-doped ceria powders were obtained by self-propagating room temperature reaction without using surfactants or templates. X-ray diffraction analysis and field emission scanning microscopy results showed that the doped samples are solid solutions with fluorite-type structure and spherical morphology. Raman spectra revealed an increase in the amount of oxygen vacancies with the increase of Mg concentration. This increasing results in a narrowing of the bandgap of CeO2. The photocatalytic performances of the Mg-doped ceria solid solutions were evaluated by decomposing an organic dye, crystal violet under UV irradiation. The Mg-doped ceria solid solutions exhibit significantly better photocatalytic activity than the pure CeO2 and commercial TiO2. The higher first rate constant of the Mg-doped samples demonstrated that they are much more efficient than TiO2 and CeO2 under UV light. Mg2+ dopant ions and oxygen vacancies play a significant role in the enhancement of photocatalytic performances of the Mg-doped ceria.",
journal = "Processing and Application of Ceramics",
title = "Influence of Mg doping on structural, optical and photocatalytic performances of ceria nanopowders",
volume = "11",
number = "4",
pages = "304-310",
doi = "10.2298/PAC1704304M"
}

Matović, B., Luković, J. M., Stojadinović, B., Aškrabić, S., Zarubica, A. R., Babić, B. M.,& Dohčević-Mitrović, Z.. (2017). Influence of Mg doping on structural, optical and photocatalytic performances of ceria nanopowders. in Processing and Application of Ceramics, 11(4), 304-310.
https://doi.org/10.2298/PAC1704304M

Matović B, Luković JM, Stojadinović B, Aškrabić S, Zarubica AR, Babić BM, Dohčević-Mitrović Z. Influence of Mg doping on structural, optical and photocatalytic performances of ceria nanopowders. in Processing and Application of Ceramics. 2017;11(4):304-310.
doi:10.2298/PAC1704304M .

Matović, Branko, Luković, Jelena M., Stojadinović, Bojan, Aškrabić, Sonja, Zarubica, Aleksandra R., Babić, Biljana M., Dohčević-Mitrović, Zorana , "Influence of Mg doping on structural, optical and photocatalytic performances of ceria nanopowders" in Processing and Application of Ceramics, 11, no. 4 (2017):304-310,
https://doi.org/10.2298/PAC1704304M . .

TY  - JOUR
AU  - Čebela, Maria
AU  - Janković, Bojan Ž.
AU  - Hercigonja, Radmila V.
AU  - Lukić, Miodrag J.
AU  - Dohčević-Mitrović, Zorana 
AU  - Milivojević, Dušan
AU  - Matović, Branko
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1411
AB  - In this paper, bismuth ferrite (BFO) particles synthesized by controlled hydrothermal process, where the particles of small sizes and with high purity were obtained. Structural analysis showed that non-annealed powder can be perfectly fitted to rhombohedral space group R3c and contains a very small amount of secondary phase, whereas the final product (annealed at 800 degrees C) represents single-phase perovskite powder with high crystallinity. HRTEM analysis confirmed existence of twin stacking faults, which are responsible for enhanced magnetic properties. EPR measurements suggested existence of electrons trapped by vacancies or defects. It has been proposed that existence of Fe3+ - O-V defect complex could be generated at elevated temperatures followed by formation of trivalent Fe ions, which intensely provide local 3d moments.
T2  - Processing and Application of Ceramics
T1  - Comprehensive characterization of BiFeO3 powder synthesized by the hydrothermal procedure
VL  - 10
IS  - 4
SP  - 201
EP  - 208
DO  - 10.2298/PAC1604201C
ER  - 

@article{
author = "Čebela, Maria and Janković, Bojan Ž. and Hercigonja, Radmila V. and Lukić, Miodrag J. and Dohčević-Mitrović, Zorana  and Milivojević, Dušan and Matović, Branko",
year = "2016",
abstract = "In this paper, bismuth ferrite (BFO) particles synthesized by controlled hydrothermal process, where the particles of small sizes and with high purity were obtained. Structural analysis showed that non-annealed powder can be perfectly fitted to rhombohedral space group R3c and contains a very small amount of secondary phase, whereas the final product (annealed at 800 degrees C) represents single-phase perovskite powder with high crystallinity. HRTEM analysis confirmed existence of twin stacking faults, which are responsible for enhanced magnetic properties. EPR measurements suggested existence of electrons trapped by vacancies or defects. It has been proposed that existence of Fe3+ - O-V defect complex could be generated at elevated temperatures followed by formation of trivalent Fe ions, which intensely provide local 3d moments.",
journal = "Processing and Application of Ceramics",
title = "Comprehensive characterization of BiFeO3 powder synthesized by the hydrothermal procedure",
volume = "10",
number = "4",
pages = "201-208",
doi = "10.2298/PAC1604201C"
}

Čebela, M., Janković, B. Ž., Hercigonja, R. V., Lukić, M. J., Dohčević-Mitrović, Z., Milivojević, D.,& Matović, B.. (2016). Comprehensive characterization of BiFeO3 powder synthesized by the hydrothermal procedure. in Processing and Application of Ceramics, 10(4), 201-208.
https://doi.org/10.2298/PAC1604201C

Čebela M, Janković BŽ, Hercigonja RV, Lukić MJ, Dohčević-Mitrović Z, Milivojević D, Matović B. Comprehensive characterization of BiFeO3 powder synthesized by the hydrothermal procedure. in Processing and Application of Ceramics. 2016;10(4):201-208.
doi:10.2298/PAC1604201C .

Čebela, Maria, Janković, Bojan Ž., Hercigonja, Radmila V., Lukić, Miodrag J., Dohčević-Mitrović, Zorana , Milivojević, Dušan, Matović, Branko, "Comprehensive characterization of BiFeO3 powder synthesized by the hydrothermal procedure" in Processing and Application of Ceramics, 10, no. 4 (2016):201-208,
https://doi.org/10.2298/PAC1604201C . .

TY  - JOUR
AU  - Rosić, Milena
AU  - Zagorac, Dejan
AU  - Milivojević, Dušan
AU  - Paunović, Novica M.
AU  - Zagorac, Jelena B.
AU  - Dohčević-Mitrović, Zorana
AU  - Matović, Branko
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1077
AB  - In order to estimate theoretical stability of the perovskite structure for synthesized Ca1-xGdxMnO3 (x = 0.05, 0.1, 0.15, 0.2) nanopowders, the Goldschmidt tolerance factor G(t) and global instability index GII were calculated. Furthermore, we have performed structure prediction of Ca1-xGdxMnO3 perovskites and found several possible perovskite-related phases. The influence of gadolinium amount on MneO bond angles and distances, tilting of MnO6 octahedra around all three axes and deformation due to the presence of the Jahn-Teller distortion around Mn3+ cation, as well as the influence of the amount of Mn3+ cation on Ca1-xGdxMnO3 compound, was examined. Ion Mn valence states were determined by bond valence calculations (BVC). Infrared active phonon modes in Ca1-xGdxMnO3 were studied by infrared reflection spectroscopy and magnetic properties were studied by using EPR (electron paramagnetic resonance) measurements. (C) 2016 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Theoretical and experimental study of octahedral tilting of Ca1-xGdxMnO3 (x=0.05, 0.1, 0.15, 0.2) nanometric powders
VL  - 678
SP  - 219
EP  - 227
DO  - 10.1016/j.jallcom.2016.03.173
ER  - 

@article{
author = "Rosić, Milena and Zagorac, Dejan and Milivojević, Dušan and Paunović, Novica M. and Zagorac, Jelena B. and Dohčević-Mitrović, Zorana and Matović, Branko",
year = "2016",
abstract = "In order to estimate theoretical stability of the perovskite structure for synthesized Ca1-xGdxMnO3 (x = 0.05, 0.1, 0.15, 0.2) nanopowders, the Goldschmidt tolerance factor G(t) and global instability index GII were calculated. Furthermore, we have performed structure prediction of Ca1-xGdxMnO3 perovskites and found several possible perovskite-related phases. The influence of gadolinium amount on MneO bond angles and distances, tilting of MnO6 octahedra around all three axes and deformation due to the presence of the Jahn-Teller distortion around Mn3+ cation, as well as the influence of the amount of Mn3+ cation on Ca1-xGdxMnO3 compound, was examined. Ion Mn valence states were determined by bond valence calculations (BVC). Infrared active phonon modes in Ca1-xGdxMnO3 were studied by infrared reflection spectroscopy and magnetic properties were studied by using EPR (electron paramagnetic resonance) measurements. (C) 2016 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Theoretical and experimental study of octahedral tilting of Ca1-xGdxMnO3 (x=0.05, 0.1, 0.15, 0.2) nanometric powders",
volume = "678",
pages = "219-227",
doi = "10.1016/j.jallcom.2016.03.173"
}

Rosić, M., Zagorac, D., Milivojević, D., Paunović, N. M., Zagorac, J. B., Dohčević-Mitrović, Z.,& Matović, B.. (2016). Theoretical and experimental study of octahedral tilting of Ca1-xGdxMnO3 (x=0.05, 0.1, 0.15, 0.2) nanometric powders. in Journal of Alloys and Compounds, 678, 219-227.
https://doi.org/10.1016/j.jallcom.2016.03.173

Rosić M, Zagorac D, Milivojević D, Paunović NM, Zagorac JB, Dohčević-Mitrović Z, Matović B. Theoretical and experimental study of octahedral tilting of Ca1-xGdxMnO3 (x=0.05, 0.1, 0.15, 0.2) nanometric powders. in Journal of Alloys and Compounds. 2016;678:219-227.
doi:10.1016/j.jallcom.2016.03.173 .

Rosić, Milena, Zagorac, Dejan, Milivojević, Dušan, Paunović, Novica M., Zagorac, Jelena B., Dohčević-Mitrović, Zorana, Matović, Branko, "Theoretical and experimental study of octahedral tilting of Ca1-xGdxMnO3 (x=0.05, 0.1, 0.15, 0.2) nanometric powders" in Journal of Alloys and Compounds, 678 (2016):219-227,
https://doi.org/10.1016/j.jallcom.2016.03.173 . .

TY  - JOUR
AU  - Dohčević-Mitrović, Zorana 
AU  - Stojadinovic, Stevan
AU  - Lozzi, Luca
AU  - Aškrabić, Sonja
AU  - Rosić, Milena
AU  - Tomić, Nataša
AU  - Paunović, Novica M.
AU  - Lazović, Saša
AU  - Nikolić, Marko G.
AU  - Santucci, Sandro
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1234
AB  - WO3/TiO2 and TiO2 coatings were prepared on titania substrates using facile and cost-effective plasma electrolytic oxidation process. The coatings were characterized by X-ray diffraction, scanning electron microscopy, Raman, UV vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. With increasing duration of PEO process, the monoclinic WO3 phase became dominant and new monoclinic WO2.95 phase appeared. The optical absorption edge in the WO3/TiO2 samples, enriched with WO3/WO2.96 phase, was shifted to the visible region. The photocatalytic efficiency of WO3/TiO2 and pure TiO2 samples was evaluated by performing the photodegradation experiments in an aqueous solution of Rhodamine 6G and Mordant Blue 9 under the visible and UV light. The WO3/TiO2 catalysts are much more efficient than pure TiO2 under visible light and slightly better under UV light. The improvement of photocatalytic activity in the visible region is attributed to better light absorption, higher adsorption affinity and increased charge separation efficiency. (C) 2016 Elsevier Ltd. All rights reserved.
T2  - Materials Research Bulletin
T1  - WO3/TiO2 composite coatings: Structural, optical and photocatalytic properties
VL  - 83
SP  - 217
EP  - 224
DO  - 10.1016/j.materresbull.2016.06.011
ER  - 

@article{
author = "Dohčević-Mitrović, Zorana  and Stojadinovic, Stevan and Lozzi, Luca and Aškrabić, Sonja and Rosić, Milena and Tomić, Nataša and Paunović, Novica M. and Lazović, Saša and Nikolić, Marko G. and Santucci, Sandro",
year = "2016",
abstract = "WO3/TiO2 and TiO2 coatings were prepared on titania substrates using facile and cost-effective plasma electrolytic oxidation process. The coatings were characterized by X-ray diffraction, scanning electron microscopy, Raman, UV vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. With increasing duration of PEO process, the monoclinic WO3 phase became dominant and new monoclinic WO2.95 phase appeared. The optical absorption edge in the WO3/TiO2 samples, enriched with WO3/WO2.96 phase, was shifted to the visible region. The photocatalytic efficiency of WO3/TiO2 and pure TiO2 samples was evaluated by performing the photodegradation experiments in an aqueous solution of Rhodamine 6G and Mordant Blue 9 under the visible and UV light. The WO3/TiO2 catalysts are much more efficient than pure TiO2 under visible light and slightly better under UV light. The improvement of photocatalytic activity in the visible region is attributed to better light absorption, higher adsorption affinity and increased charge separation efficiency. (C) 2016 Elsevier Ltd. All rights reserved.",
journal = "Materials Research Bulletin",
title = "WO3/TiO2 composite coatings: Structural, optical and photocatalytic properties",
volume = "83",
pages = "217-224",
doi = "10.1016/j.materresbull.2016.06.011"
}

Dohčević-Mitrović, Z., Stojadinovic, S., Lozzi, L., Aškrabić, S., Rosić, M., Tomić, N., Paunović, N. M., Lazović, S., Nikolić, M. G.,& Santucci, S.. (2016). WO3/TiO2 composite coatings: Structural, optical and photocatalytic properties. in Materials Research Bulletin, 83, 217-224.
https://doi.org/10.1016/j.materresbull.2016.06.011

Dohčević-Mitrović Z, Stojadinovic S, Lozzi L, Aškrabić S, Rosić M, Tomić N, Paunović NM, Lazović S, Nikolić MG, Santucci S. WO3/TiO2 composite coatings: Structural, optical and photocatalytic properties. in Materials Research Bulletin. 2016;83:217-224.
doi:10.1016/j.materresbull.2016.06.011 .

Dohčević-Mitrović, Zorana , Stojadinovic, Stevan, Lozzi, Luca, Aškrabić, Sonja, Rosić, Milena, Tomić, Nataša, Paunović, Novica M., Lazović, Saša, Nikolić, Marko G., Santucci, Sandro, "WO3/TiO2 composite coatings: Structural, optical and photocatalytic properties" in Materials Research Bulletin, 83 (2016):217-224,
https://doi.org/10.1016/j.materresbull.2016.06.011 . .

TY  - JOUR
AU  - Tomić, Nataša
AU  - Dohčević-Mitrović, Zorana
AU  - Paunović, Novica M.
AU  - Mijin, Dušan Ž.
AU  - Radić, Nenad D.
AU  - Grbic, Bosko V.
AU  - Aškrabić, Sonja
AU  - Babić, Biljana M.
AU  - Bajuk-Bogdanović, Danica V.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9685
AB  - Ultrafine CeO2-delta nanopowder, prepared by a simple and cost-effective self-propagating room temperature synthesis method (SPRT), showed high adsorption capability for removal of different azo dyes. Batch type of adsorption experiments with fixed initial pH value were conducted for the removal of Reactive Orange 16 (RO16), Methyl Orange (MO), and Mordant Blue 9 (MB9). The equilibrium adsorption data were evaluated using Freundlich and Langmuir isotherm models. The Langmuir model slightly better describes isotherm data for RO16 and MO, whereas the Freundlich model was found to best fit the isotherm data for MB9 over the whole concentration range. The maximum adsorption capacities, determined from isotherm data for MO, MB9, and RO16 were 113, 101, and 91 mg g(1) respectively. The adsorption process follows the pseudo-second-order kinetic model indicating the coexistence of chemisorption and physisorption. The mechanism of azo dye adsorption is also discussed.
T2  - Langmuir
T1  - Nanocrystalline CeO2-delta as Effective Adsorbent of Azo Dyes
VL  - 30
IS  - 39
SP  - 11582
EP  - 11590
DO  - 10.1021/la502969w
ER  - 

@article{
author = "Tomić, Nataša and Dohčević-Mitrović, Zorana and Paunović, Novica M. and Mijin, Dušan Ž. and Radić, Nenad D. and Grbic, Bosko V. and Aškrabić, Sonja and Babić, Biljana M. and Bajuk-Bogdanović, Danica V.",
year = "2014",
abstract = "Ultrafine CeO2-delta nanopowder, prepared by a simple and cost-effective self-propagating room temperature synthesis method (SPRT), showed high adsorption capability for removal of different azo dyes. Batch type of adsorption experiments with fixed initial pH value were conducted for the removal of Reactive Orange 16 (RO16), Methyl Orange (MO), and Mordant Blue 9 (MB9). The equilibrium adsorption data were evaluated using Freundlich and Langmuir isotherm models. The Langmuir model slightly better describes isotherm data for RO16 and MO, whereas the Freundlich model was found to best fit the isotherm data for MB9 over the whole concentration range. The maximum adsorption capacities, determined from isotherm data for MO, MB9, and RO16 were 113, 101, and 91 mg g(1) respectively. The adsorption process follows the pseudo-second-order kinetic model indicating the coexistence of chemisorption and physisorption. The mechanism of azo dye adsorption is also discussed.",
journal = "Langmuir",
title = "Nanocrystalline CeO2-delta as Effective Adsorbent of Azo Dyes",
volume = "30",
number = "39",
pages = "11582-11590",
doi = "10.1021/la502969w"
}

Tomić, N., Dohčević-Mitrović, Z., Paunović, N. M., Mijin, D. Ž., Radić, N. D., Grbic, B. V., Aškrabić, S., Babić, B. M.,& Bajuk-Bogdanović, D. V.. (2014). Nanocrystalline CeO2-delta as Effective Adsorbent of Azo Dyes. in Langmuir, 30(39), 11582-11590.
https://doi.org/10.1021/la502969w

Tomić N, Dohčević-Mitrović Z, Paunović NM, Mijin DŽ, Radić ND, Grbic BV, Aškrabić S, Babić BM, Bajuk-Bogdanović DV. Nanocrystalline CeO2-delta as Effective Adsorbent of Azo Dyes. in Langmuir. 2014;30(39):11582-11590.
doi:10.1021/la502969w .

Tomić, Nataša, Dohčević-Mitrović, Zorana, Paunović, Novica M., Mijin, Dušan Ž., Radić, Nenad D., Grbic, Bosko V., Aškrabić, Sonja, Babić, Biljana M., Bajuk-Bogdanović, Danica V., "Nanocrystalline CeO2-delta as Effective Adsorbent of Azo Dyes" in Langmuir, 30, no. 39 (2014):11582-11590,
https://doi.org/10.1021/la502969w . .

TY  - JOUR
AU  - Radović, Marko B.
AU  - Stojadinović, Bojan
AU  - Tomić, Nataša
AU  - Golubović, Aleksandar V.
AU  - Matović, Branko
AU  - Veljkovic, Ivana
AU  - Dohčević-Mitrović, Zorana 
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/308
AB  - Synthesis process strongly influences the nanocrystalline CeO2-y defective structure. The presence of surface defects, in the form of oxygen vacancies in different charge states (F centers), can change the electronic properties of ceria nanocrystals. Nanocrystalline CeO2-y samples were synthesized using three different methods (precipitation, self-propagating room temperature, and hydrothermal synthesis). Raman spectroscopy was used to identify the presence of oxygen vacancies which presumably were formed at the nanoparticle surface. The defect concentration depended on the crystallite size of differently prepared CeO2-y samples. Scanning tunneling microscopy/spectroscopy and ellipsometry were employed to investigate the electronic band structure of defective CeO2-y nanocrystals. Scanning tunneling spectroscopy measurements demonstrated that inside the band gap of CeO2-y nanocrystals, besides the filled 4 f states, appeared additional states which were related to occupied and empty F center defect states. From the ellipsometric measurements, using the critical points model, the energy positions of different F centers states and the values of the reduced band gap energies were determined. The analysis of obtained data pointed out that depending on the synthesis method, different types of F centers (F+ and F-0) can be formed in the CeO2-y nanocrystals. The formation of different F center defect states inside the ceria gap have a strong impact on the electrical, optical, and magnetic properties of ceria nanocrystals. (C) 2014 AIP Publishing LLC.
T2  - Journal of Applied Physics
T1  - Investigation of surface defect states in CeO2-y nanocrystals by Scanning-tunneling microscopy/spectroscopy and ellipsometry
VL  - 116
IS  - 23
DO  - 10.1063/1.4904516
ER  - 

@article{
author = "Radović, Marko B. and Stojadinović, Bojan and Tomić, Nataša and Golubović, Aleksandar V. and Matović, Branko and Veljkovic, Ivana and Dohčević-Mitrović, Zorana ",
year = "2014",
abstract = "Synthesis process strongly influences the nanocrystalline CeO2-y defective structure. The presence of surface defects, in the form of oxygen vacancies in different charge states (F centers), can change the electronic properties of ceria nanocrystals. Nanocrystalline CeO2-y samples were synthesized using three different methods (precipitation, self-propagating room temperature, and hydrothermal synthesis). Raman spectroscopy was used to identify the presence of oxygen vacancies which presumably were formed at the nanoparticle surface. The defect concentration depended on the crystallite size of differently prepared CeO2-y samples. Scanning tunneling microscopy/spectroscopy and ellipsometry were employed to investigate the electronic band structure of defective CeO2-y nanocrystals. Scanning tunneling spectroscopy measurements demonstrated that inside the band gap of CeO2-y nanocrystals, besides the filled 4 f states, appeared additional states which were related to occupied and empty F center defect states. From the ellipsometric measurements, using the critical points model, the energy positions of different F centers states and the values of the reduced band gap energies were determined. The analysis of obtained data pointed out that depending on the synthesis method, different types of F centers (F+ and F-0) can be formed in the CeO2-y nanocrystals. The formation of different F center defect states inside the ceria gap have a strong impact on the electrical, optical, and magnetic properties of ceria nanocrystals. (C) 2014 AIP Publishing LLC.",
journal = "Journal of Applied Physics",
title = "Investigation of surface defect states in CeO2-y nanocrystals by Scanning-tunneling microscopy/spectroscopy and ellipsometry",
volume = "116",
number = "23",
doi = "10.1063/1.4904516"
}

Radović, M. B., Stojadinović, B., Tomić, N., Golubović, A. V., Matović, B., Veljkovic, I.,& Dohčević-Mitrović, Z.. (2014). Investigation of surface defect states in CeO2-y nanocrystals by Scanning-tunneling microscopy/spectroscopy and ellipsometry. in Journal of Applied Physics, 116(23).
https://doi.org/10.1063/1.4904516

Radović MB, Stojadinović B, Tomić N, Golubović AV, Matović B, Veljkovic I, Dohčević-Mitrović Z. Investigation of surface defect states in CeO2-y nanocrystals by Scanning-tunneling microscopy/spectroscopy and ellipsometry. in Journal of Applied Physics. 2014;116(23).
doi:10.1063/1.4904516 .

Radović, Marko B., Stojadinović, Bojan, Tomić, Nataša, Golubović, Aleksandar V., Matović, Branko, Veljkovic, Ivana, Dohčević-Mitrović, Zorana , "Investigation of surface defect states in CeO2-y nanocrystals by Scanning-tunneling microscopy/spectroscopy and ellipsometry" in Journal of Applied Physics, 116, no. 23 (2014),
https://doi.org/10.1063/1.4904516 . .

TY  - JOUR
AU  - Grbic, Bosko
AU  - Radić, Nenad
AU  - Stojadinovic, Stevan
AU  - Vasilic, Rastko
AU  - Dohčević-Mitrović, Zorana 
AU  - Šaponjić, Zoran
AU  - Stefanov, Plamen
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/315
AB  - TiO2/WO3 composites supported on a stainless steel foil were prepared by the spray pyrolysis technique. Content of WO3 was gradually increased from 1 wt% to 100 wt.%, while the coating thickness was limited to about 1 pm. The coatings were characterized by X-ray diffraction, scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. The photocatalytic activity of obtained coatings was investigated by degradation of methyl orange, used as model pollutant. The results show that with increasing WO3 content up to 10 wt.% photoactivity increases as result of better charge separation that could effectively prevent the recombination of photogenerated electrons and holes. Further increase of WO3 content led to decrease of photoactivity. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Surface and Coatings Technology
T1  - TiO2/WO3 photocatalytic composite coatings prepared by spray pyrolysis
VL  - 258
SP  - 763
EP  - 771
DO  - 10.1016/j.surfcoat.2014.07.082
ER  - 

@article{
author = "Grbic, Bosko and Radić, Nenad and Stojadinovic, Stevan and Vasilic, Rastko and Dohčević-Mitrović, Zorana  and Šaponjić, Zoran and Stefanov, Plamen",
year = "2014",
abstract = "TiO2/WO3 composites supported on a stainless steel foil were prepared by the spray pyrolysis technique. Content of WO3 was gradually increased from 1 wt% to 100 wt.%, while the coating thickness was limited to about 1 pm. The coatings were characterized by X-ray diffraction, scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. The photocatalytic activity of obtained coatings was investigated by degradation of methyl orange, used as model pollutant. The results show that with increasing WO3 content up to 10 wt.% photoactivity increases as result of better charge separation that could effectively prevent the recombination of photogenerated electrons and holes. Further increase of WO3 content led to decrease of photoactivity. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Surface and Coatings Technology",
title = "TiO2/WO3 photocatalytic composite coatings prepared by spray pyrolysis",
volume = "258",
pages = "763-771",
doi = "10.1016/j.surfcoat.2014.07.082"
}

Grbic, B., Radić, N., Stojadinovic, S., Vasilic, R., Dohčević-Mitrović, Z., Šaponjić, Z.,& Stefanov, P.. (2014). TiO2/WO3 photocatalytic composite coatings prepared by spray pyrolysis. in Surface and Coatings Technology, 258, 763-771.
https://doi.org/10.1016/j.surfcoat.2014.07.082

Grbic B, Radić N, Stojadinovic S, Vasilic R, Dohčević-Mitrović Z, Šaponjić Z, Stefanov P. TiO2/WO3 photocatalytic composite coatings prepared by spray pyrolysis. in Surface and Coatings Technology. 2014;258:763-771.
doi:10.1016/j.surfcoat.2014.07.082 .

Grbic, Bosko, Radić, Nenad, Stojadinovic, Stevan, Vasilic, Rastko, Dohčević-Mitrović, Zorana , Šaponjić, Zoran, Stefanov, Plamen, "TiO2/WO3 photocatalytic composite coatings prepared by spray pyrolysis" in Surface and Coatings Technology, 258 (2014):763-771,
https://doi.org/10.1016/j.surfcoat.2014.07.082 . .

TY  - JOUR
AU  - Matović, Branko
AU  - Dukić, Jelena
AU  - Babić, Biljana M.
AU  - Bučevac, Dušan
AU  - Dohčević-Mitrović, Zorana 
AU  - Radović, Marko B.
AU  - Bošković, Snežana B.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5497
AB  - Nanometric ceria powders with fluorite-type structure were obtained by applying self-propagating room temperature method. The obtained powders were subsequently thermally treated (calcined) at different temperatures for different times. Powder properties such as specific surface area, crystallite size, particle size and lattice parameter have been studied. Roentgen diffraction analysis (XRD), BET and Raman scattering measurements were used to characterize the as-obtained (uncalcined) powder as well as powders calcined at different temperatures. It was found that the average diameter of the as-obtained crystallites is in the range of 3-5 nm whereas the specific surface area is about 70 m(2)/g. The subsequent, 15 min long, calcination of as-obtained powder at different temperatures gradually increased crystallite size up to similar to 60 nm and reduced specific surface down to 6 m(2)/g. Raman spectra of synthesized CeO2-y depicts a strong red shift of active triply degenerate F-2 (g) mode as well as additional peak at 600 cm(-1). The frequency of F-2 g mode increased while its line width decreased with an increase in calcination temperature. Such a behavior is considered to be the result of particle size increase and agglomeration during the calcination. After the heat treatment at 800 degrees C crystallite size reached value larger than 50 nm. Second order Raman mode, which originates from intrinsic oxygen vacancies, disappeared after calcination. (c) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Synthesis, calcination and characterization of Nanosized ceria powders by self-propagating room temperature method
VL  - 39
IS  - 5
SP  - 5007
EP  - 5012
DO  - 10.1016/j.ceramint.2012.11.098
ER  - 

@article{
author = "Matović, Branko and Dukić, Jelena and Babić, Biljana M. and Bučevac, Dušan and Dohčević-Mitrović, Zorana  and Radović, Marko B. and Bošković, Snežana B.",
year = "2013",
abstract = "Nanometric ceria powders with fluorite-type structure were obtained by applying self-propagating room temperature method. The obtained powders were subsequently thermally treated (calcined) at different temperatures for different times. Powder properties such as specific surface area, crystallite size, particle size and lattice parameter have been studied. Roentgen diffraction analysis (XRD), BET and Raman scattering measurements were used to characterize the as-obtained (uncalcined) powder as well as powders calcined at different temperatures. It was found that the average diameter of the as-obtained crystallites is in the range of 3-5 nm whereas the specific surface area is about 70 m(2)/g. The subsequent, 15 min long, calcination of as-obtained powder at different temperatures gradually increased crystallite size up to similar to 60 nm and reduced specific surface down to 6 m(2)/g. Raman spectra of synthesized CeO2-y depicts a strong red shift of active triply degenerate F-2 (g) mode as well as additional peak at 600 cm(-1). The frequency of F-2 g mode increased while its line width decreased with an increase in calcination temperature. Such a behavior is considered to be the result of particle size increase and agglomeration during the calcination. After the heat treatment at 800 degrees C crystallite size reached value larger than 50 nm. Second order Raman mode, which originates from intrinsic oxygen vacancies, disappeared after calcination. (c) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Synthesis, calcination and characterization of Nanosized ceria powders by self-propagating room temperature method",
volume = "39",
number = "5",
pages = "5007-5012",
doi = "10.1016/j.ceramint.2012.11.098"
}

Matović, B., Dukić, J., Babić, B. M., Bučevac, D., Dohčević-Mitrović, Z., Radović, M. B.,& Bošković, S. B.. (2013). Synthesis, calcination and characterization of Nanosized ceria powders by self-propagating room temperature method. in Ceramics International, 39(5), 5007-5012.
https://doi.org/10.1016/j.ceramint.2012.11.098

Matović B, Dukić J, Babić BM, Bučevac D, Dohčević-Mitrović Z, Radović MB, Bošković SB. Synthesis, calcination and characterization of Nanosized ceria powders by self-propagating room temperature method. in Ceramics International. 2013;39(5):5007-5012.
doi:10.1016/j.ceramint.2012.11.098 .

Matović, Branko, Dukić, Jelena, Babić, Biljana M., Bučevac, Dušan, Dohčević-Mitrović, Zorana , Radović, Marko B., Bošković, Snežana B., "Synthesis, calcination and characterization of Nanosized ceria powders by self-propagating room temperature method" in Ceramics International, 39, no. 5 (2013):5007-5012,
https://doi.org/10.1016/j.ceramint.2012.11.098 . .

TY  - JOUR
AU  - Babić, Biljana M.
AU  - Gulicovski, Jelena J.
AU  - Dohčević-Mitrović, Zorana 
AU  - Bučevac, Dušan
AU  - Prekajski-Đorđević, Marija D.
AU  - Zagorac, Jelena B.
AU  - Matović, Branko
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4636
AB  - Titanium dioxide nanopowders, doped with different amounts of Fe3+ ions (0.3-5 mass%), were synthesized by acid-catalyzed sol-gel method in a non-aqueous medium. The obtained powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and determination of izoelectric points as well as particle diameters. Careful investigation of porous structure was provided by application of nitrogen adsorption-desorption method. Structure analysis showed that the obtained nanopowders exhibited the anatase crystal structure, independent of the amount of iron dopants. The presence of Fe3+ ions in anatase decreases the value of isoelectric point of undoped TiO2. Unlike crystal structure, porosity parameters are strongly affected by the amount of iron ions incorporated in TiO2 lattice. The mesoporosity of TiO2 can be successfully controlled by changing the amount of iron dopants. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Synthesis and characterization of Fe3+ doped titanium dioxide nanopowders
VL  - 38
IS  - 1
SP  - 635
EP  - 640
DO  - 10.1016/j.ceramint.2011.07.053
ER  - 

@article{
author = "Babić, Biljana M. and Gulicovski, Jelena J. and Dohčević-Mitrović, Zorana  and Bučevac, Dušan and Prekajski-Đorđević, Marija D. and Zagorac, Jelena B. and Matović, Branko",
year = "2012",
abstract = "Titanium dioxide nanopowders, doped with different amounts of Fe3+ ions (0.3-5 mass%), were synthesized by acid-catalyzed sol-gel method in a non-aqueous medium. The obtained powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and determination of izoelectric points as well as particle diameters. Careful investigation of porous structure was provided by application of nitrogen adsorption-desorption method. Structure analysis showed that the obtained nanopowders exhibited the anatase crystal structure, independent of the amount of iron dopants. The presence of Fe3+ ions in anatase decreases the value of isoelectric point of undoped TiO2. Unlike crystal structure, porosity parameters are strongly affected by the amount of iron ions incorporated in TiO2 lattice. The mesoporosity of TiO2 can be successfully controlled by changing the amount of iron dopants. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Synthesis and characterization of Fe3+ doped titanium dioxide nanopowders",
volume = "38",
number = "1",
pages = "635-640",
doi = "10.1016/j.ceramint.2011.07.053"
}

Babić, B. M., Gulicovski, J. J., Dohčević-Mitrović, Z., Bučevac, D., Prekajski-Đorđević, M. D., Zagorac, J. B.,& Matović, B.. (2012). Synthesis and characterization of Fe3+ doped titanium dioxide nanopowders. in Ceramics International, 38(1), 635-640.
https://doi.org/10.1016/j.ceramint.2011.07.053

Babić BM, Gulicovski JJ, Dohčević-Mitrović Z, Bučevac D, Prekajski-Đorđević MD, Zagorac JB, Matović B. Synthesis and characterization of Fe3+ doped titanium dioxide nanopowders. in Ceramics International. 2012;38(1):635-640.
doi:10.1016/j.ceramint.2011.07.053 .

Babić, Biljana M., Gulicovski, Jelena J., Dohčević-Mitrović, Zorana , Bučevac, Dušan, Prekajski-Đorđević, Marija D., Zagorac, Jelena B., Matović, Branko, "Synthesis and characterization of Fe3+ doped titanium dioxide nanopowders" in Ceramics International, 38, no. 1 (2012):635-640,
https://doi.org/10.1016/j.ceramint.2011.07.053 . .

TY  - JOUR
AU  - Paunović, Novica M.
AU  - Dohčević-Mitrović, Zorana 
AU  - Scurtu, Rares
AU  - Aškrabić, Sonja
AU  - Prekajski, Marija D.
AU  - Matović, Branko
AU  - Popović, Zoran V.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4992
AB  - Ce1-xPrxO2-delta (0 LT = x LT = 0.4) nanocrystals were synthesized by self-propagating method and thoroughly characterized using X-ray diffraction, Raman and X-ray photoelectron spectroscopy and magnetic measurements. Undoped CeO2 nanocrystals exhibited intrinsic ferromagnetism at room temperature. Despite the increased concentration of oxygen vacancies in doped samples, our results showed that ferromagnetic ordering rapidly degrades with Pr doping. The suppression of ferromagnetism can be explained in terms of the different dopant valence state, the different nature of the vacancies formed in Pr-doped samples and their ability/disability to establish the ferromagnetic ordering.
T2  - Nanoscale
T1  - Suppression of inherent ferromagnetism in Pr-doped CeO2 nanocrystals
VL  - 4
IS  - 17
SP  - 5469
EP  - 5476
DO  - 10.1039/c2nr30799e
ER  - 

@article{
author = "Paunović, Novica M. and Dohčević-Mitrović, Zorana  and Scurtu, Rares and Aškrabić, Sonja and Prekajski, Marija D. and Matović, Branko and Popović, Zoran V.",
year = "2012",
abstract = "Ce1-xPrxO2-delta (0 LT = x LT = 0.4) nanocrystals were synthesized by self-propagating method and thoroughly characterized using X-ray diffraction, Raman and X-ray photoelectron spectroscopy and magnetic measurements. Undoped CeO2 nanocrystals exhibited intrinsic ferromagnetism at room temperature. Despite the increased concentration of oxygen vacancies in doped samples, our results showed that ferromagnetic ordering rapidly degrades with Pr doping. The suppression of ferromagnetism can be explained in terms of the different dopant valence state, the different nature of the vacancies formed in Pr-doped samples and their ability/disability to establish the ferromagnetic ordering.",
journal = "Nanoscale",
title = "Suppression of inherent ferromagnetism in Pr-doped CeO2 nanocrystals",
volume = "4",
number = "17",
pages = "5469-5476",
doi = "10.1039/c2nr30799e"
}

Paunović, N. M., Dohčević-Mitrović, Z., Scurtu, R., Aškrabić, S., Prekajski, M. D., Matović, B.,& Popović, Z. V.. (2012). Suppression of inherent ferromagnetism in Pr-doped CeO2 nanocrystals. in Nanoscale, 4(17), 5469-5476.
https://doi.org/10.1039/c2nr30799e

Paunović NM, Dohčević-Mitrović Z, Scurtu R, Aškrabić S, Prekajski MD, Matović B, Popović ZV. Suppression of inherent ferromagnetism in Pr-doped CeO2 nanocrystals. in Nanoscale. 2012;4(17):5469-5476.
doi:10.1039/c2nr30799e .

Paunović, Novica M., Dohčević-Mitrović, Zorana , Scurtu, Rares, Aškrabić, Sonja, Prekajski, Marija D., Matović, Branko, Popović, Zoran V., "Suppression of inherent ferromagnetism in Pr-doped CeO2 nanocrystals" in Nanoscale, 4, no. 17 (2012):5469-5476,
https://doi.org/10.1039/c2nr30799e . .

TY  - JOUR
AU  - Šćepanović, Maja
AU  - Abramović, Biljana F.
AU  - Golubović, Aleksandar V.
AU  - Kler, Sanja
AU  - Grujić-Brojčin, Mirjana
AU  - Dohčević-Mitrović, Zorana 
AU  - Babić, Biljana M.
AU  - Matović, Branko
AU  - Popović, Zoran V.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4656
AB  - Nanocrystalline titanium dioxide (TiO2) powders have been synthesized by sol-gel method using titanium tetrachloride (TiCl4) or tetrabutyl titanate (Ti(OC4H9)(4) as precursors, different alcohols and calcination temperatures in the range from 400 to 650 A degrees C. The photocatalytic activity of as-prepared powders has been tested for the degradation of metoprolol tartrate salt, a selective beta-blocker used to treat a variety of cardiovascular diseases, and compared to photocatalytic activity obtained from Degussa P25. Nanosized TiO2 powders prepared from TiCl4 and amyl-alcohol, calcined at 550 A degrees C, displayed an activity comparable to Degussa P25, whereas the sample from the same series, calcined at 650 A degrees C, showed higher photocatalytic activity in the whole range of the catalyst loading. Structural, morphological and surface properties of synthesized TiO2 nanopowders have been investigated by XRD, SEM, EDS and BET measurements, as well as FTIR and Raman spectroscopy, in order to find out the material properties which enable rapid an efficient decomposition of metoprolol under UV radiation.
T2  - Journal of Sol-gel Science and Technology
T1  - Photocatalytic degradation of metoprolol in water suspension of TiO2 nanopowders prepared using sol-gel route
VL  - 61
IS  - 2
SP  - 390
EP  - 402
DO  - 10.1007/s10971-011-2639-9
ER  - 

@article{
author = "Šćepanović, Maja and Abramović, Biljana F. and Golubović, Aleksandar V. and Kler, Sanja and Grujić-Brojčin, Mirjana and Dohčević-Mitrović, Zorana  and Babić, Biljana M. and Matović, Branko and Popović, Zoran V.",
year = "2012",
abstract = "Nanocrystalline titanium dioxide (TiO2) powders have been synthesized by sol-gel method using titanium tetrachloride (TiCl4) or tetrabutyl titanate (Ti(OC4H9)(4) as precursors, different alcohols and calcination temperatures in the range from 400 to 650 A degrees C. The photocatalytic activity of as-prepared powders has been tested for the degradation of metoprolol tartrate salt, a selective beta-blocker used to treat a variety of cardiovascular diseases, and compared to photocatalytic activity obtained from Degussa P25. Nanosized TiO2 powders prepared from TiCl4 and amyl-alcohol, calcined at 550 A degrees C, displayed an activity comparable to Degussa P25, whereas the sample from the same series, calcined at 650 A degrees C, showed higher photocatalytic activity in the whole range of the catalyst loading. Structural, morphological and surface properties of synthesized TiO2 nanopowders have been investigated by XRD, SEM, EDS and BET measurements, as well as FTIR and Raman spectroscopy, in order to find out the material properties which enable rapid an efficient decomposition of metoprolol under UV radiation.",
journal = "Journal of Sol-gel Science and Technology",
title = "Photocatalytic degradation of metoprolol in water suspension of TiO2 nanopowders prepared using sol-gel route",
volume = "61",
number = "2",
pages = "390-402",
doi = "10.1007/s10971-011-2639-9"
}

Šćepanović, M., Abramović, B. F., Golubović, A. V., Kler, S., Grujić-Brojčin, M., Dohčević-Mitrović, Z., Babić, B. M., Matović, B.,& Popović, Z. V.. (2012). Photocatalytic degradation of metoprolol in water suspension of TiO2 nanopowders prepared using sol-gel route. in Journal of Sol-gel Science and Technology, 61(2), 390-402.
https://doi.org/10.1007/s10971-011-2639-9

Šćepanović M, Abramović BF, Golubović AV, Kler S, Grujić-Brojčin M, Dohčević-Mitrović Z, Babić BM, Matović B, Popović ZV. Photocatalytic degradation of metoprolol in water suspension of TiO2 nanopowders prepared using sol-gel route. in Journal of Sol-gel Science and Technology. 2012;61(2):390-402.
doi:10.1007/s10971-011-2639-9 .

Šćepanović, Maja, Abramović, Biljana F., Golubović, Aleksandar V., Kler, Sanja, Grujić-Brojčin, Mirjana, Dohčević-Mitrović, Zorana , Babić, Biljana M., Matović, Branko, Popović, Zoran V., "Photocatalytic degradation of metoprolol in water suspension of TiO2 nanopowders prepared using sol-gel route" in Journal of Sol-gel Science and Technology, 61, no. 2 (2012):390-402,
https://doi.org/10.1007/s10971-011-2639-9 . .