Tomic, N.

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  • Tomic, N. (4)
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Author's Bibliography

Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals

Radović, Marko B.; Dohcevic-Mitrovic, Z.; Paunović, Novica M.; Bošković, Snežana B.; Tomic, N.; Tadić, Nenad; Belca, I.

(2015)

TY  - JOUR
AU  - Radović, Marko B.
AU  - Dohcevic-Mitrovic, Z.
AU  - Paunović, Novica M.
AU  - Bošković, Snežana B.
AU  - Tomic, N.
AU  - Tadić, Nenad
AU  - Belca, I.
PY  - 2015
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/379
AB  - Plasmon-longitudinal-optical (LO) phonon interaction in pure and Nd-doped CeO2-y nanocrystals was investigated by measuring far-infrared reflectivity spectra in the 100-700 cm(-1) spectral range at room temperature. Analysis of the obtained results revealed that the presence of free charge carriers becomes significant with the particle size decrease to nanometer range and increase of lattice defects. The free charge carriers were found to be responsible for a plasmon mode which coupled strongly with two LO phonon modes of ceria. The presence of more pronounced low-frequency Drude tail and the screening of the phonon modes in Nd-doped CeO2-y nanocrystals implied that the Plasmon-LO phonon interaction increased with doping. Factorized and additive dielectric function models were applied to deduce about the coupled and decoupled LO phonon frequencies and the structure of the decoupled plasmon mode in pure and Nd-doped CeO2-y nanocrystals. These models were combined with Bruggeman effective medium approximation in order to properly describe the influence of porosity on the infrared reflectivity spectra. With increasing dopant content, the decoupled plasmon mode exhibited redshift and damping decrease implying that doping induced semiconductor-to-metalic state transition took place.
T2  - Journal of Physics. D: Applied Physics
T1  - Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals
VL  - 48
IS  - 6
DO  - 10.1088/0022-3727/48/6/065301
ER  - 
@article{
author = "Radović, Marko B. and Dohcevic-Mitrovic, Z. and Paunović, Novica M. and Bošković, Snežana B. and Tomic, N. and Tadić, Nenad and Belca, I.",
year = "2015",
url = "http://vinar.vin.bg.ac.rs/handle/123456789/379",
abstract = "Plasmon-longitudinal-optical (LO) phonon interaction in pure and Nd-doped CeO2-y nanocrystals was investigated by measuring far-infrared reflectivity spectra in the 100-700 cm(-1) spectral range at room temperature. Analysis of the obtained results revealed that the presence of free charge carriers becomes significant with the particle size decrease to nanometer range and increase of lattice defects. The free charge carriers were found to be responsible for a plasmon mode which coupled strongly with two LO phonon modes of ceria. The presence of more pronounced low-frequency Drude tail and the screening of the phonon modes in Nd-doped CeO2-y nanocrystals implied that the Plasmon-LO phonon interaction increased with doping. Factorized and additive dielectric function models were applied to deduce about the coupled and decoupled LO phonon frequencies and the structure of the decoupled plasmon mode in pure and Nd-doped CeO2-y nanocrystals. These models were combined with Bruggeman effective medium approximation in order to properly describe the influence of porosity on the infrared reflectivity spectra. With increasing dopant content, the decoupled plasmon mode exhibited redshift and damping decrease implying that doping induced semiconductor-to-metalic state transition took place.",
journal = "Journal of Physics. D: Applied Physics",
title = "Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals",
volume = "48",
number = "6",
doi = "10.1088/0022-3727/48/6/065301"
}
Radović, M. B., Dohcevic-Mitrovic, Z., Paunović, N. M., Bošković, S. B., Tomic, N., Tadić, N.,& Belca, I. (2015). Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals.
Journal of Physics. D: Applied Physics, 48(6).
https://doi.org/10.1088/0022-3727/48/6/065301
Radović MB, Dohcevic-Mitrovic Z, Paunović NM, Bošković SB, Tomic N, Tadić N, Belca I. Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals. Journal of Physics. D: Applied Physics. 2015;48(6)
Radović Marko B., Dohcevic-Mitrovic Z., Paunović Novica M., Bošković Snežana B., Tomic N., Tadić Nenad, Belca I., "Infrared study of plasmon-phonon coupling in pure and Nd-doped CeO2-y nanocrystals" Journal of Physics. D: Applied Physics, 48, no. 6 (2015),
https://doi.org/10.1088/0022-3727/48/6/065301 .
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Photocatalytic degradation of alprazolam in water suspension of brookite type TiO2 nanopowders prepared using hydrothermal route

Tomic, N.; Grujić-Brojčin, Mirjana; Finčur, Nina L.; Abramović, Biljana F.; Simovic, B.; Krstić, Jelena; Matović, Branko; Scepanovic, M.

(2015)

TY  - JOUR
AU  - Tomic, N.
AU  - Grujić-Brojčin, Mirjana
AU  - Finčur, Nina L.
AU  - Abramović, Biljana F.
AU  - Simovic, B.
AU  - Krstić, Jelena
AU  - Matović, Branko
AU  - Scepanovic, M.
PY  - 2015
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/821
AB  - Two series of nanocrystalline brookite-type powders have been synthesized by using combined sal gel hydrothermal method with titanium tetrachloride (TiCI4) as a precursor and hydrothermal temperature and reaction time varied in the range of 120-200 degrees C and 12-48 h, respectively. The effects of chosen synthesis parameters on structural, morphological and optical properties of synthesized powders have been investigated by the XRPD, SEM, EDS and BET measurements, as well Raman spectroscopy and spectroscopic ellipsometry. The XRPD results have shown that pure brookite phase, with mean crystallite size of -33 nm, has been obtained only in the sample synthesized at 200 degrees C, after 24 h of hydrothermal process. In all other samples anatase phase also appears, whereas rutile and sodium titanate phases have been noticed in the samples synthesized at lower temperatures. The presence of different titania phases has also been confirmed and analyzed by Raman scattering measurements. The SEM measurements have shown spindle-like particles in brookite-rich samples synthesized at 200 degrees C, whereas BET measurements have detected mesoporous structure in these samples. The properties of synthesized powders have been correlated to their photocatalytic efficiency, tested in degradation of alprazolam, one of the 5th generation benzodiazepines. The sample consisted of pure brookite has shown the highest efficiency in the photodegradation of alprazolam, practically equal to the activity of Degussa P25. (C) 2015 Elsevier B.V. All rights reserved.
T2  - Materials Chemistry and Physics
T1  - Photocatalytic degradation of alprazolam in water suspension of brookite type TiO2 nanopowders prepared using hydrothermal route
VL  - 163
SP  - 518
EP  - 528
DO  - 10.1016/j.matchemphys.2015.08.008
ER  - 
@article{
author = "Tomic, N. and Grujić-Brojčin, Mirjana and Finčur, Nina L. and Abramović, Biljana F. and Simovic, B. and Krstić, Jelena and Matović, Branko and Scepanovic, M.",
year = "2015",
url = "http://vinar.vin.bg.ac.rs/handle/123456789/821",
abstract = "Two series of nanocrystalline brookite-type powders have been synthesized by using combined sal gel hydrothermal method with titanium tetrachloride (TiCI4) as a precursor and hydrothermal temperature and reaction time varied in the range of 120-200 degrees C and 12-48 h, respectively. The effects of chosen synthesis parameters on structural, morphological and optical properties of synthesized powders have been investigated by the XRPD, SEM, EDS and BET measurements, as well Raman spectroscopy and spectroscopic ellipsometry. The XRPD results have shown that pure brookite phase, with mean crystallite size of -33 nm, has been obtained only in the sample synthesized at 200 degrees C, after 24 h of hydrothermal process. In all other samples anatase phase also appears, whereas rutile and sodium titanate phases have been noticed in the samples synthesized at lower temperatures. The presence of different titania phases has also been confirmed and analyzed by Raman scattering measurements. The SEM measurements have shown spindle-like particles in brookite-rich samples synthesized at 200 degrees C, whereas BET measurements have detected mesoporous structure in these samples. The properties of synthesized powders have been correlated to their photocatalytic efficiency, tested in degradation of alprazolam, one of the 5th generation benzodiazepines. The sample consisted of pure brookite has shown the highest efficiency in the photodegradation of alprazolam, practically equal to the activity of Degussa P25. (C) 2015 Elsevier B.V. All rights reserved.",
journal = "Materials Chemistry and Physics",
title = "Photocatalytic degradation of alprazolam in water suspension of brookite type TiO2 nanopowders prepared using hydrothermal route",
volume = "163",
pages = "518-528",
doi = "10.1016/j.matchemphys.2015.08.008"
}
Tomic, N., Grujić-Brojčin, M., Finčur, N. L., Abramović, B. F., Simovic, B., Krstić, J., Matović, B.,& Scepanovic, M. (2015). Photocatalytic degradation of alprazolam in water suspension of brookite type TiO2 nanopowders prepared using hydrothermal route.
Materials Chemistry and Physics, 163, 518-528.
https://doi.org/10.1016/j.matchemphys.2015.08.008
Tomic N, Grujić-Brojčin M, Finčur NL, Abramović BF, Simovic B, Krstić J, Matović B, Scepanovic M. Photocatalytic degradation of alprazolam in water suspension of brookite type TiO2 nanopowders prepared using hydrothermal route. Materials Chemistry and Physics. 2015;163:518-528
Tomic N., Grujić-Brojčin Mirjana, Finčur Nina L., Abramović Biljana F., Simovic B., Krstić Jelena, Matović Branko, Scepanovic M., "Photocatalytic degradation of alprazolam in water suspension of brookite type TiO2 nanopowders prepared using hydrothermal route" Materials Chemistry and Physics, 163 (2015):518-528,
https://doi.org/10.1016/j.matchemphys.2015.08.008 .
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Surface modification of sol-gel synthesized TiO2 nanoparticles induced by La-doping

Grujić-Brojčin, Mirjana; Armaković, Sanja J.; Tomic, N.; Abramović, Biljana F.; Golubavic, A.; Stojadinovic, B.; Kremenović, Aleksandar S.; Babić, Biljana M.; Dohcevic-Mitrovic, Z.; Scepanovic, M.

(2014)

TY  - JOUR
AU  - Grujić-Brojčin, Mirjana
AU  - Armaković, Sanja J.
AU  - Tomic, N.
AU  - Abramović, Biljana F.
AU  - Golubavic, A.
AU  - Stojadinovic, B.
AU  - Kremenović, Aleksandar S.
AU  - Babić, Biljana M.
AU  - Dohcevic-Mitrovic, Z.
AU  - Scepanovic, M.
PY  - 2014
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/5881
AB  - The influence of La-doping in the range of 0.5-6.0 mol% on structural and morphological properties of TiO2 nanopowders synthesized by sol-gel routine has been investigated by XRPD, AFM, EDS and BET measurements, as well as Raman spectroscopy. The XRPD and Raman measurements have revealed the anatase phase as dominant in all nanopowders, with crystallite size decreasing from similar to 15 nm in pure TiO2 to similar to 12 nm in La-doped samples. The BET data suggest that all samples are fully mesoporous, with mean pore diameters in the range of similar to 6-8 nm. The specific surface area and the complexity of pore structure are greater in doped samples than in pure TiO2 sample. The spectroscopic ellipsometry has apparently shown that the band gap has been gradually increased with the increase of La content. The STM and STS techniques have been used successfully to evaluate the surface morphology and electronic properties of La-doped nanopowders. All investigated properties have been related to photocatalytic activity, tested in degradation of a metoprolol tartrate salt (0.05 mM), and induced by UV-radiation. All doped samples showed increased photocatalytic activity compared to pure TiO2, among which the 0.65 mol% La-doped sample appeared to be the most efficient. (C) 2013 Elsevier Inc. All rights reserved.
T2  - Materials Characterization
T1  - Surface modification of sol-gel synthesized TiO2 nanoparticles induced by La-doping
VL  - 88
SP  - 30
EP  - 41
DO  - 10.1016/j.matchar.2013.12.002
ER  - 
@article{
author = "Grujić-Brojčin, Mirjana and Armaković, Sanja J. and Tomic, N. and Abramović, Biljana F. and Golubavic, A. and Stojadinovic, B. and Kremenović, Aleksandar S. and Babić, Biljana M. and Dohcevic-Mitrovic, Z. and Scepanovic, M.",
year = "2014",
url = "http://vinar.vin.bg.ac.rs/handle/123456789/5881",
abstract = "The influence of La-doping in the range of 0.5-6.0 mol% on structural and morphological properties of TiO2 nanopowders synthesized by sol-gel routine has been investigated by XRPD, AFM, EDS and BET measurements, as well as Raman spectroscopy. The XRPD and Raman measurements have revealed the anatase phase as dominant in all nanopowders, with crystallite size decreasing from similar to 15 nm in pure TiO2 to similar to 12 nm in La-doped samples. The BET data suggest that all samples are fully mesoporous, with mean pore diameters in the range of similar to 6-8 nm. The specific surface area and the complexity of pore structure are greater in doped samples than in pure TiO2 sample. The spectroscopic ellipsometry has apparently shown that the band gap has been gradually increased with the increase of La content. The STM and STS techniques have been used successfully to evaluate the surface morphology and electronic properties of La-doped nanopowders. All investigated properties have been related to photocatalytic activity, tested in degradation of a metoprolol tartrate salt (0.05 mM), and induced by UV-radiation. All doped samples showed increased photocatalytic activity compared to pure TiO2, among which the 0.65 mol% La-doped sample appeared to be the most efficient. (C) 2013 Elsevier Inc. All rights reserved.",
journal = "Materials Characterization",
title = "Surface modification of sol-gel synthesized TiO2 nanoparticles induced by La-doping",
volume = "88",
pages = "30-41",
doi = "10.1016/j.matchar.2013.12.002"
}
Grujić-Brojčin, M., Armaković, S. J., Tomic, N., Abramović, B. F., Golubavic, A., Stojadinovic, B., Kremenović, A. S., Babić, B. M., Dohcevic-Mitrovic, Z.,& Scepanovic, M. (2014). Surface modification of sol-gel synthesized TiO2 nanoparticles induced by La-doping.
Materials Characterization, 88, 30-41.
https://doi.org/10.1016/j.matchar.2013.12.002
Grujić-Brojčin M, Armaković SJ, Tomic N, Abramović BF, Golubavic A, Stojadinovic B, Kremenović AS, Babić BM, Dohcevic-Mitrovic Z, Scepanovic M. Surface modification of sol-gel synthesized TiO2 nanoparticles induced by La-doping. Materials Characterization. 2014;88:30-41
Grujić-Brojčin Mirjana, Armaković Sanja J., Tomic N., Abramović Biljana F., Golubavic A., Stojadinovic B., Kremenović Aleksandar S., Babić Biljana M., Dohcevic-Mitrovic Z., Scepanovic M., "Surface modification of sol-gel synthesized TiO2 nanoparticles induced by La-doping" Materials Characterization, 88 (2014):30-41,
https://doi.org/10.1016/j.matchar.2013.12.002 .
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Synthesis of pure and La-doped anatase nanopowders by sol-gel and hydrothermal methods and their efficiency in photocatalytic degradation of alprazolam

Golubović, Aleksandar V.; Tomic, N.; Finčur, Nina L.; Abramović, Biljana F.; Veljkovic, I.; Zdravkovic, J.; Grujić-Brojčin, Mirjana; Babić, Biljana M.; Stojadinovic, B.; Scepanovic, M.

(2014)

TY  - JOUR
AU  - Golubović, Aleksandar V.
AU  - Tomic, N.
AU  - Finčur, Nina L.
AU  - Abramović, Biljana F.
AU  - Veljkovic, I.
AU  - Zdravkovic, J.
AU  - Grujić-Brojčin, Mirjana
AU  - Babić, Biljana M.
AU  - Stojadinovic, B.
AU  - Scepanovic, M.
PY  - 2014
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/127
AB  - Pure and La3+ doped titanium dioxide (TiO2) nanopowders were obtained by sol gel and hydrothermal methods. A precursor was titanium tetrachloride and concentrations of dopants were 0.5 and 1.0 mol%. Procedures of both methods were the same, up to the last part of synthesis (the transformation from the mother liquor to oxide nanopowders), in order to find the influence of applied methods on the properties of nanopowders. XRD results have shown that all synthesized nanopowders were in the anatase phase. It was seen from DSC measurements that anatase to rutile phase transition took place at a higher temperature with a higher concentration of dopant (La3+). The samples obtained by the sol gel method had a higher temperature of phase transition than related samples obtained by the hydrothermal method. Nanopowder properties have been related to the photocatalytic activity, tested in degradation of the pharmaceutical alprazolam. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Synthesis of pure and La-doped anatase nanopowders by sol-gel and hydrothermal methods and their efficiency in photocatalytic degradation of alprazolam
VL  - 40
IS  - 8
SP  - 13409
EP  - 13418
DO  - 10.1016/j.ceramint.2014.05.060
ER  - 
@article{
author = "Golubović, Aleksandar V. and Tomic, N. and Finčur, Nina L. and Abramović, Biljana F. and Veljkovic, I. and Zdravkovic, J. and Grujić-Brojčin, Mirjana and Babić, Biljana M. and Stojadinovic, B. and Scepanovic, M.",
year = "2014",
url = "http://vinar.vin.bg.ac.rs/handle/123456789/127",
abstract = "Pure and La3+ doped titanium dioxide (TiO2) nanopowders were obtained by sol gel and hydrothermal methods. A precursor was titanium tetrachloride and concentrations of dopants were 0.5 and 1.0 mol%. Procedures of both methods were the same, up to the last part of synthesis (the transformation from the mother liquor to oxide nanopowders), in order to find the influence of applied methods on the properties of nanopowders. XRD results have shown that all synthesized nanopowders were in the anatase phase. It was seen from DSC measurements that anatase to rutile phase transition took place at a higher temperature with a higher concentration of dopant (La3+). The samples obtained by the sol gel method had a higher temperature of phase transition than related samples obtained by the hydrothermal method. Nanopowder properties have been related to the photocatalytic activity, tested in degradation of the pharmaceutical alprazolam. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Synthesis of pure and La-doped anatase nanopowders by sol-gel and hydrothermal methods and their efficiency in photocatalytic degradation of alprazolam",
volume = "40",
number = "8",
pages = "13409-13418",
doi = "10.1016/j.ceramint.2014.05.060"
}
Golubović, A. V., Tomic, N., Finčur, N. L., Abramović, B. F., Veljkovic, I., Zdravkovic, J., Grujić-Brojčin, M., Babić, B. M., Stojadinovic, B.,& Scepanovic, M. (2014). Synthesis of pure and La-doped anatase nanopowders by sol-gel and hydrothermal methods and their efficiency in photocatalytic degradation of alprazolam.
Ceramics International, 40(8), 13409-13418.
https://doi.org/10.1016/j.ceramint.2014.05.060
Golubović AV, Tomic N, Finčur NL, Abramović BF, Veljkovic I, Zdravkovic J, Grujić-Brojčin M, Babić BM, Stojadinovic B, Scepanovic M. Synthesis of pure and La-doped anatase nanopowders by sol-gel and hydrothermal methods and their efficiency in photocatalytic degradation of alprazolam. Ceramics International. 2014;40(8):13409-13418
Golubović Aleksandar V., Tomic N., Finčur Nina L., Abramović Biljana F., Veljkovic I., Zdravkovic J., Grujić-Brojčin Mirjana, Babić Biljana M., Stojadinovic B., Scepanovic M., "Synthesis of pure and La-doped anatase nanopowders by sol-gel and hydrothermal methods and their efficiency in photocatalytic degradation of alprazolam" Ceramics International, 40, no. 8 (2014):13409-13418,
https://doi.org/10.1016/j.ceramint.2014.05.060 .
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