TY  - JOUR
AU  - Radović, Marko B.
AU  - Dohcevic-Mitrovic, Z.
AU  - Paunović, Novica M.
AU  - Šćepanović, Maja
AU  - Matović, Branko
AU  - Popović, Zoran V.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6835
AB  - We have measured the Raman scattering and magnetization of pure and Fe2+(Fe3+) doped CeO2 nanopowders at room temperature. The Raman scattering spectra revealed the existence of CeO2 fluorite cubic structure for all investigated samples. The Raman active mode at about 600 cm(-1), seen in all samples, can be ascribed to the CeO2 intrinsic oxygen vacancies. Additional Raman modes at 720 cm(-1), 1320 cm(-1) and 1600 cm(-1), which appear in the spectra of doped samples, can be assigned to maghemite (gamma-Fe2O3) cation deficient structure, to 2 omega(LO) IR-allowed overtone and two magnon structure, respectively. This implies that our powders are composed of mixed valence states and have defective structure. Presence of oxygen defect states and magnetic ions can be responsible for the observed ferromagnetism at room temperature in both pure and Fe doped samples.
T2  - Acta Physica Polonica A
T1  - Effect of Fe2+ (Fe3+) Doping on Structural Properties of CeO2 Nanocrystals
VL  - 116
IS  - 1
SP  - 84
EP  - 87
DO  - 10.12693/APhysPolA.116.84
ER  - 

@article{
author = "Radović, Marko B. and Dohcevic-Mitrovic, Z. and Paunović, Novica M. and Šćepanović, Maja and Matović, Branko and Popović, Zoran V.",
year = "2009",
abstract = "We have measured the Raman scattering and magnetization of pure and Fe2+(Fe3+) doped CeO2 nanopowders at room temperature. The Raman scattering spectra revealed the existence of CeO2 fluorite cubic structure for all investigated samples. The Raman active mode at about 600 cm(-1), seen in all samples, can be ascribed to the CeO2 intrinsic oxygen vacancies. Additional Raman modes at 720 cm(-1), 1320 cm(-1) and 1600 cm(-1), which appear in the spectra of doped samples, can be assigned to maghemite (gamma-Fe2O3) cation deficient structure, to 2 omega(LO) IR-allowed overtone and two magnon structure, respectively. This implies that our powders are composed of mixed valence states and have defective structure. Presence of oxygen defect states and magnetic ions can be responsible for the observed ferromagnetism at room temperature in both pure and Fe doped samples.",
journal = "Acta Physica Polonica A",
title = "Effect of Fe2+ (Fe3+) Doping on Structural Properties of CeO2 Nanocrystals",
volume = "116",
number = "1",
pages = "84-87",
doi = "10.12693/APhysPolA.116.84"
}

Radović, M. B., Dohcevic-Mitrovic, Z., Paunović, N. M., Šćepanović, M., Matović, B.,& Popović, Z. V.. (2009). Effect of Fe2+ (Fe3+) Doping on Structural Properties of CeO2 Nanocrystals. in Acta Physica Polonica A, 116(1), 84-87.
https://doi.org/10.12693/APhysPolA.116.84

Radović MB, Dohcevic-Mitrovic Z, Paunović NM, Šćepanović M, Matović B, Popović ZV. Effect of Fe2+ (Fe3+) Doping on Structural Properties of CeO2 Nanocrystals. in Acta Physica Polonica A. 2009;116(1):84-87.
doi:10.12693/APhysPolA.116.84 .

Radović, Marko B., Dohcevic-Mitrovic, Z., Paunović, Novica M., Šćepanović, Maja, Matović, Branko, Popović, Zoran V., "Effect of Fe2+ (Fe3+) Doping on Structural Properties of CeO2 Nanocrystals" in Acta Physica Polonica A, 116, no. 1 (2009):84-87,
https://doi.org/10.12693/APhysPolA.116.84 . .

TY  - JOUR
AU  - Radović, Marko B.
AU  - Dohcevic-Mitrovic, Z. D.
AU  - Golubović, Aleksandar V.
AU  - Matović, Branko
AU  - Šćepanović, Maja
AU  - Popović, Zoran V.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6845
AB  - Pure and 10 mol% Fe3+ doped CeO2 nanocrystals were synthesized by hydrothermal method using two different basic solutions (NH4OH and NaOH). All the samples were calcinated at 140 degrees C and 200 degrees C. The characterization of crystalline structure, vibrational and optical properties was performed using X-ray diffraction, Raman spectroscopy and spectroscopic ellipsometry. The obtained results showed that the Fe-doped samples are solid solutions with different size of nanocrystals, very dependent on the synthesis temperature and type of basic solution. The Raman measurements demonstrated electron molecular vibrational coupling and increase of oxygen vacancy concentration whereas doping provokes a small decrease of optical absorption edge in comparison with pure ceria.
T2  - Acta Physica Polonica A
T1  - Hydrothermal Synthesis of CeO2 and Ce0.9Fe0.1O2 Nanocrystals
VL  - 116
IS  - 4
SP  - 614
EP  - 617
DO  - 10.12693/APhysPolA.116.614
ER  - 

@article{
author = "Radović, Marko B. and Dohcevic-Mitrovic, Z. D. and Golubović, Aleksandar V. and Matović, Branko and Šćepanović, Maja and Popović, Zoran V.",
year = "2009",
abstract = "Pure and 10 mol% Fe3+ doped CeO2 nanocrystals were synthesized by hydrothermal method using two different basic solutions (NH4OH and NaOH). All the samples were calcinated at 140 degrees C and 200 degrees C. The characterization of crystalline structure, vibrational and optical properties was performed using X-ray diffraction, Raman spectroscopy and spectroscopic ellipsometry. The obtained results showed that the Fe-doped samples are solid solutions with different size of nanocrystals, very dependent on the synthesis temperature and type of basic solution. The Raman measurements demonstrated electron molecular vibrational coupling and increase of oxygen vacancy concentration whereas doping provokes a small decrease of optical absorption edge in comparison with pure ceria.",
journal = "Acta Physica Polonica A",
title = "Hydrothermal Synthesis of CeO2 and Ce0.9Fe0.1O2 Nanocrystals",
volume = "116",
number = "4",
pages = "614-617",
doi = "10.12693/APhysPolA.116.614"
}

Radović, M. B., Dohcevic-Mitrovic, Z. D., Golubović, A. V., Matović, B., Šćepanović, M.,& Popović, Z. V.. (2009). Hydrothermal Synthesis of CeO2 and Ce0.9Fe0.1O2 Nanocrystals. in Acta Physica Polonica A, 116(4), 614-617.
https://doi.org/10.12693/APhysPolA.116.614

Radović MB, Dohcevic-Mitrovic ZD, Golubović AV, Matović B, Šćepanović M, Popović ZV. Hydrothermal Synthesis of CeO2 and Ce0.9Fe0.1O2 Nanocrystals. in Acta Physica Polonica A. 2009;116(4):614-617.
doi:10.12693/APhysPolA.116.614 .

Radović, Marko B., Dohcevic-Mitrovic, Z. D., Golubović, Aleksandar V., Matović, Branko, Šćepanović, Maja, Popović, Zoran V., "Hydrothermal Synthesis of CeO2 and Ce0.9Fe0.1O2 Nanocrystals" in Acta Physica Polonica A, 116, no. 4 (2009):614-617,
https://doi.org/10.12693/APhysPolA.116.614 . .

TY  - JOUR
AU  - Kostić, Radmila
AU  - Romčević, Maja J.
AU  - Romčević, Nebojša Ž.
AU  - Klopotowski, L.
AU  - Kossut, J.
AU  - Kujanin-Jakovjevic, J.
AU  - Čomor, Mirjana
AU  - Nedeljković, Jovan
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6733
AB  - The nanocomposite consisting of PbS quantum dots with average diameter of 26 A and polyvinyl alcohol was characterized using photoluminescence and far-infrared spectroscopy. Photoluminescence spectra of nanocomposite, measured in temperature range from 8 to 280 K, consists of broad peak which spans the energy range from 1.2 to 2.1 eV and can be connected with trap states inside the band gap. Far-infrared measurements are consistent with theoretical calculations that include mechanical boundary conditions at the quantum dot - host interface. Observed peak at 90 cm(-1) can be assigned to coupled modes with l(p) = 1, while broad peak at 275 cm(-1) is above any lattice frequency and is close to sum of the frequencies of the l(p) = 0 acoustic and l(p) = 0 coupled optical mode of PbS quantum dots. (c) 2007 Elsevier B.V. All rights reserved.
T2  - Optical Materials
T1  - Photoluminescence and far-infrared spectroscopy of PbS quantum dots - Polyvinyl alcohol nanocomposite
VL  - 30
IS  - 7
SP  - 1177
EP  - 1182
DO  - 10.1016/j.optmat.2007.05.044
ER  - 

@article{
author = "Kostić, Radmila and Romčević, Maja J. and Romčević, Nebojša Ž. and Klopotowski, L. and Kossut, J. and Kujanin-Jakovjevic, J. and Čomor, Mirjana and Nedeljković, Jovan",
year = "2008",
abstract = "The nanocomposite consisting of PbS quantum dots with average diameter of 26 A and polyvinyl alcohol was characterized using photoluminescence and far-infrared spectroscopy. Photoluminescence spectra of nanocomposite, measured in temperature range from 8 to 280 K, consists of broad peak which spans the energy range from 1.2 to 2.1 eV and can be connected with trap states inside the band gap. Far-infrared measurements are consistent with theoretical calculations that include mechanical boundary conditions at the quantum dot - host interface. Observed peak at 90 cm(-1) can be assigned to coupled modes with l(p) = 1, while broad peak at 275 cm(-1) is above any lattice frequency and is close to sum of the frequencies of the l(p) = 0 acoustic and l(p) = 0 coupled optical mode of PbS quantum dots. (c) 2007 Elsevier B.V. All rights reserved.",
journal = "Optical Materials",
title = "Photoluminescence and far-infrared spectroscopy of PbS quantum dots - Polyvinyl alcohol nanocomposite",
volume = "30",
number = "7",
pages = "1177-1182",
doi = "10.1016/j.optmat.2007.05.044"
}

Kostić, R., Romčević, M. J., Romčević, N. Ž., Klopotowski, L., Kossut, J., Kujanin-Jakovjevic, J., Čomor, M.,& Nedeljković, J.. (2008). Photoluminescence and far-infrared spectroscopy of PbS quantum dots - Polyvinyl alcohol nanocomposite. in Optical Materials, 30(7), 1177-1182.
https://doi.org/10.1016/j.optmat.2007.05.044

Kostić R, Romčević MJ, Romčević NŽ, Klopotowski L, Kossut J, Kujanin-Jakovjevic J, Čomor M, Nedeljković J. Photoluminescence and far-infrared spectroscopy of PbS quantum dots - Polyvinyl alcohol nanocomposite. in Optical Materials. 2008;30(7):1177-1182.
doi:10.1016/j.optmat.2007.05.044 .

Kostić, Radmila, Romčević, Maja J., Romčević, Nebojša Ž., Klopotowski, L., Kossut, J., Kujanin-Jakovjevic, J., Čomor, Mirjana, Nedeljković, Jovan, "Photoluminescence and far-infrared spectroscopy of PbS quantum dots - Polyvinyl alcohol nanocomposite" in Optical Materials, 30, no. 7 (2008):1177-1182,
https://doi.org/10.1016/j.optmat.2007.05.044 . .

TY  - JOUR
AU  - Radović, Marko B.
AU  - Dohcevic-Mitrovic, Z.
AU  - Šćepanović, Maja
AU  - Grujić-Brojčin, Mirjana
AU  - Matović, Branko
AU  - Bošković, Snežana B.
AU  - Popvic, Z. V.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3382
AB  - A series of Ce1-xBaxO2-y (5 LT = x LT = 0.20) nanometric powders were synthesized by self-propagating room temperature synthesis. XRD and Raman scattering measurements were used to characterize the samples. at room temperature. All the samples are solid solutions with fluorite type structure with an average crystallite size about 5 nm. The redshift and asymmetric broadening of the Raman F g mode can be well explained with combined confinement and strain effects because of the nanocrystalline powders nature. The appearance of the additional peaks at similar to 560 cm(-1) and similar to 600 cm(-1), are attributed to extrinsic and intrinsic O2- vacancies in ceria lattice. Raman spectra of temperature treated Ce0.80Ba0.20O2-delta sample revealed the instability of this system.
T2  - Science of Sintering
T1  - Raman study of Ba-doped ceria nanopowders
VL  - 39
IS  - 3
SP  - 281
EP  - 286
DO  - 10.2298/SOS0703281R
ER  - 

@article{
author = "Radović, Marko B. and Dohcevic-Mitrovic, Z. and Šćepanović, Maja and Grujić-Brojčin, Mirjana and Matović, Branko and Bošković, Snežana B. and Popvic, Z. V.",
year = "2007",
abstract = "A series of Ce1-xBaxO2-y (5 LT = x LT = 0.20) nanometric powders were synthesized by self-propagating room temperature synthesis. XRD and Raman scattering measurements were used to characterize the samples. at room temperature. All the samples are solid solutions with fluorite type structure with an average crystallite size about 5 nm. The redshift and asymmetric broadening of the Raman F g mode can be well explained with combined confinement and strain effects because of the nanocrystalline powders nature. The appearance of the additional peaks at similar to 560 cm(-1) and similar to 600 cm(-1), are attributed to extrinsic and intrinsic O2- vacancies in ceria lattice. Raman spectra of temperature treated Ce0.80Ba0.20O2-delta sample revealed the instability of this system.",
journal = "Science of Sintering",
title = "Raman study of Ba-doped ceria nanopowders",
volume = "39",
number = "3",
pages = "281-286",
doi = "10.2298/SOS0703281R"
}

Radović, M. B., Dohcevic-Mitrovic, Z., Šćepanović, M., Grujić-Brojčin, M., Matović, B., Bošković, S. B.,& Popvic, Z. V.. (2007). Raman study of Ba-doped ceria nanopowders. in Science of Sintering, 39(3), 281-286.
https://doi.org/10.2298/SOS0703281R

Radović MB, Dohcevic-Mitrovic Z, Šćepanović M, Grujić-Brojčin M, Matović B, Bošković SB, Popvic ZV. Raman study of Ba-doped ceria nanopowders. in Science of Sintering. 2007;39(3):281-286.
doi:10.2298/SOS0703281R .

Radović, Marko B., Dohcevic-Mitrovic, Z., Šćepanović, Maja, Grujić-Brojčin, Mirjana, Matović, Branko, Bošković, Snežana B., Popvic, Z. V., "Raman study of Ba-doped ceria nanopowders" in Science of Sintering, 39, no. 3 (2007):281-286,
https://doi.org/10.2298/SOS0703281R . .