Ahrenkiel, Scott Phillip

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  • Ahrenkiel, Scott Phillip (17)

Author's Bibliography

Formation of ZnIn2S4 nanosheets and tubular structures in organic media

Carević, Milica V.; Savić, Tatjana D.; Abazović, Nadica; Mitrić, Miodrag; Stojanović, Zoran A.; Ahrenkiel, Scott Phillip; Čomor, Mirjana

(2017)

TY  - JOUR
AU  - Carević, Milica V.
AU  - Savić, Tatjana D.
AU  - Abazović, Nadica
AU  - Mitrić, Miodrag
AU  - Stojanović, Zoran A.
AU  - Ahrenkiel, Scott Phillip
AU  - Čomor, Mirjana
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1397
AB  - Hot-injection method for synthesis of ZnIn2S4 (ZIS) in organic media was studied. Nanosized ZnIn2S4 is successfully synthesized in oleic acid/oleylamine mixture in different ratios, which are both: complexing and/or capping agents. Nanosheets/nanoscrolls of about 50 nm are obtained. The band gaps of synthesized nanostructures were calculated to be in the range from 2.6 to 3.0 eV, values which are increased compared to bulk value (2.3-2.5 eV). The increase of band gap can be assigned to nanodimensions of the particles. Potential of band edges is calculated using empirical equation and find to be in the range from -0.16 to -0.36 V for conduction band, and from 2.24 to 2.69 V for valence band. By using XRD and TEM techniques, crystal structure and morphology of obtained materials were investigated, and detailed formation and growth mechanism of nanosheets/nanoscroles is proposed accordingly. (C) 2016 Elsevier Ltd. All rights reserved.
T2  - Materials Research Bulletin
T1  - Formation of ZnIn2S4 nanosheets and tubular structures in organic media
VL  - 87
SP  - 140
EP  - 147
DO  - 10.1016/j.materresbull.2016.11.037
ER  - 
@article{
author = "Carević, Milica V. and Savić, Tatjana D. and Abazović, Nadica and Mitrić, Miodrag and Stojanović, Zoran A. and Ahrenkiel, Scott Phillip and Čomor, Mirjana",
year = "2017",
abstract = "Hot-injection method for synthesis of ZnIn2S4 (ZIS) in organic media was studied. Nanosized ZnIn2S4 is successfully synthesized in oleic acid/oleylamine mixture in different ratios, which are both: complexing and/or capping agents. Nanosheets/nanoscrolls of about 50 nm are obtained. The band gaps of synthesized nanostructures were calculated to be in the range from 2.6 to 3.0 eV, values which are increased compared to bulk value (2.3-2.5 eV). The increase of band gap can be assigned to nanodimensions of the particles. Potential of band edges is calculated using empirical equation and find to be in the range from -0.16 to -0.36 V for conduction band, and from 2.24 to 2.69 V for valence band. By using XRD and TEM techniques, crystal structure and morphology of obtained materials were investigated, and detailed formation and growth mechanism of nanosheets/nanoscroles is proposed accordingly. (C) 2016 Elsevier Ltd. All rights reserved.",
journal = "Materials Research Bulletin",
title = "Formation of ZnIn2S4 nanosheets and tubular structures in organic media",
volume = "87",
pages = "140-147",
doi = "10.1016/j.materresbull.2016.11.037"
}
Carević, M. V., Savić, T. D., Abazović, N., Mitrić, M., Stojanović, Z. A., Ahrenkiel, S. P.,& Čomor, M.. (2017). Formation of ZnIn2S4 nanosheets and tubular structures in organic media. in Materials Research Bulletin, 87, 140-147.
https://doi.org/10.1016/j.materresbull.2016.11.037
Carević MV, Savić TD, Abazović N, Mitrić M, Stojanović ZA, Ahrenkiel SP, Čomor M. Formation of ZnIn2S4 nanosheets and tubular structures in organic media. in Materials Research Bulletin. 2017;87:140-147.
doi:10.1016/j.materresbull.2016.11.037 .
Carević, Milica V., Savić, Tatjana D., Abazović, Nadica, Mitrić, Miodrag, Stojanović, Zoran A., Ahrenkiel, Scott Phillip, Čomor, Mirjana, "Formation of ZnIn2S4 nanosheets and tubular structures in organic media" in Materials Research Bulletin, 87 (2017):140-147,
https://doi.org/10.1016/j.materresbull.2016.11.037 . .
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Synthesis, Characterization, and Antimicrobial Activity of Silver Nanoparticles on Poly(GMA-co-EGDMA) Polymer Support

Vukoje, Ivana D.; Džunuzović, Enis S.; Lončarević, Davor; Dimitrijević, Suzana I.; Ahrenkiel, Scott Phillip; Nedeljković, Jovan

(2017)

TY  - JOUR
AU  - Vukoje, Ivana D.
AU  - Džunuzović, Enis S.
AU  - Lončarević, Davor
AU  - Dimitrijević, Suzana I.
AU  - Ahrenkiel, Scott Phillip
AU  - Nedeljković, Jovan
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1361
AB  - Poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) (poly(GMA-co-EGDMA) macroporous copolymer decorated with silver nanoparticles was prepared by a modification of poly(GMA-co-EGDMA) in the reaction with arginine, and consequent reduction of silver ions with amino groups. The mercury intrusion porosimetry, transmission electron microscopy, X-ray diffraction, UV-vis reflection spectroscopy, and inductively coupled plasma atomic emission measurements were used to characterize obtained composite. The coordination of silver nanoparticles to the poly(GMA-co-EGDMA) copolymer was studied using infrared spectroscopy. Time dependence and concentration dependence of the antimicrobial efficiency of composite were tested against Gram-negative bacteria Escherichia coli, Gram-positive bacteria Staphylococcus aureus, and fungus Candida albicans. The composite ensured maximum reduction of both bacteria, while the fungi reduction reached satisfactory 96.8%. Preliminary antimicrobial efficiency measurements using laboratory flow setup indicated potential applicability of composite for wastewater treatment. (C) 2015 Society of Plastics Engineers
T2  - Polymer Composites
T1  - Synthesis, Characterization, and Antimicrobial Activity of Silver Nanoparticles on Poly(GMA-co-EGDMA) Polymer Support
VL  - 38
IS  - 6
SP  - 1206
EP  - 1214
DO  - 10.1002/pc.23684
ER  - 
@article{
author = "Vukoje, Ivana D. and Džunuzović, Enis S. and Lončarević, Davor and Dimitrijević, Suzana I. and Ahrenkiel, Scott Phillip and Nedeljković, Jovan",
year = "2017",
abstract = "Poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) (poly(GMA-co-EGDMA) macroporous copolymer decorated with silver nanoparticles was prepared by a modification of poly(GMA-co-EGDMA) in the reaction with arginine, and consequent reduction of silver ions with amino groups. The mercury intrusion porosimetry, transmission electron microscopy, X-ray diffraction, UV-vis reflection spectroscopy, and inductively coupled plasma atomic emission measurements were used to characterize obtained composite. The coordination of silver nanoparticles to the poly(GMA-co-EGDMA) copolymer was studied using infrared spectroscopy. Time dependence and concentration dependence of the antimicrobial efficiency of composite were tested against Gram-negative bacteria Escherichia coli, Gram-positive bacteria Staphylococcus aureus, and fungus Candida albicans. The composite ensured maximum reduction of both bacteria, while the fungi reduction reached satisfactory 96.8%. Preliminary antimicrobial efficiency measurements using laboratory flow setup indicated potential applicability of composite for wastewater treatment. (C) 2015 Society of Plastics Engineers",
journal = "Polymer Composites",
title = "Synthesis, Characterization, and Antimicrobial Activity of Silver Nanoparticles on Poly(GMA-co-EGDMA) Polymer Support",
volume = "38",
number = "6",
pages = "1206-1214",
doi = "10.1002/pc.23684"
}
Vukoje, I. D., Džunuzović, E. S., Lončarević, D., Dimitrijević, S. I., Ahrenkiel, S. P.,& Nedeljković, J.. (2017). Synthesis, Characterization, and Antimicrobial Activity of Silver Nanoparticles on Poly(GMA-co-EGDMA) Polymer Support. in Polymer Composites, 38(6), 1206-1214.
https://doi.org/10.1002/pc.23684
Vukoje ID, Džunuzović ES, Lončarević D, Dimitrijević SI, Ahrenkiel SP, Nedeljković J. Synthesis, Characterization, and Antimicrobial Activity of Silver Nanoparticles on Poly(GMA-co-EGDMA) Polymer Support. in Polymer Composites. 2017;38(6):1206-1214.
doi:10.1002/pc.23684 .
Vukoje, Ivana D., Džunuzović, Enis S., Lončarević, Davor, Dimitrijević, Suzana I., Ahrenkiel, Scott Phillip, Nedeljković, Jovan, "Synthesis, Characterization, and Antimicrobial Activity of Silver Nanoparticles on Poly(GMA-co-EGDMA) Polymer Support" in Polymer Composites, 38, no. 6 (2017):1206-1214,
https://doi.org/10.1002/pc.23684 . .
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Detailed study of structural and luminescent properties of Y2-xEuxZr2O7 (0 LT = x LT = 1) nanophosphors

Papan, Jelena; Vuković, Katarina; Ahrenkiel, Scott Phillip; Jovanović, Dragana J.; Dramićanin, Miroslav

(2017)

TY  - JOUR
AU  - Papan, Jelena
AU  - Vuković, Katarina
AU  - Ahrenkiel, Scott Phillip
AU  - Jovanović, Dragana J.
AU  - Dramićanin, Miroslav
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1586
AB  - Nanocrystalline Y2-xEuxZr2O7 (0 LT = x LT = 1) phosphor particles were prepared by polymer facilitated combustion and subsequent calcination at 800 degrees C. The thorough study of Eu-concentration influence on particles structure, morphology and luminescence is presented. This type of synthesis provides particles of similar to 5 nm in diameter, which crystallize in a defect fluorite structure (space group Fm-3m), and where each particle consists of a single crystallite, as revealed by X-ray diffraction and high-resolution transmission electron microscopy. With the increase of Eu concentration, the unit-cell parameter slightly increases to accommodate larger Eu3+ ions at sites of smaller Y3+, while the shape and size of particles remain the same. Analysis of emission intensity and decay dependence on Eu concentration showed that this host material could be heavily doped with Eu since concentration quenching of emission occurs at high Eu content of 25-30 at.% (with respect to Y ions). The critical distance for energy transfer between Eu ions is estimated to 10.28 A and dipole-quadrupole interaction is found as the dominant mechanism responsible for the concentration quenching of emission. Radiative and non-radiative transition rates, the quantum efficiency of emission, Omega-intensity parameters, and branching ratios of Eu3+ emission are calculated for nanocrystals of all doping concentrations. It is found that more to-the-point expression 86% of emission comes from D-5(0) - GT F-7(2) and D-5(0) - GT F-7(1) transitions. Therefore, this phosphor emits pure red light with (0.661, 0.338) CIE color coordinates. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Detailed study of structural and luminescent properties of Y2-xEuxZr2O7 (0 LT = x LT = 1) nanophosphors
VL  - 712
SP  - 437
EP  - 444
DO  - 10.1016/j.jallcom.2017.04.139
ER  - 
@article{
author = "Papan, Jelena and Vuković, Katarina and Ahrenkiel, Scott Phillip and Jovanović, Dragana J. and Dramićanin, Miroslav",
year = "2017",
abstract = "Nanocrystalline Y2-xEuxZr2O7 (0 LT = x LT = 1) phosphor particles were prepared by polymer facilitated combustion and subsequent calcination at 800 degrees C. The thorough study of Eu-concentration influence on particles structure, morphology and luminescence is presented. This type of synthesis provides particles of similar to 5 nm in diameter, which crystallize in a defect fluorite structure (space group Fm-3m), and where each particle consists of a single crystallite, as revealed by X-ray diffraction and high-resolution transmission electron microscopy. With the increase of Eu concentration, the unit-cell parameter slightly increases to accommodate larger Eu3+ ions at sites of smaller Y3+, while the shape and size of particles remain the same. Analysis of emission intensity and decay dependence on Eu concentration showed that this host material could be heavily doped with Eu since concentration quenching of emission occurs at high Eu content of 25-30 at.% (with respect to Y ions). The critical distance for energy transfer between Eu ions is estimated to 10.28 A and dipole-quadrupole interaction is found as the dominant mechanism responsible for the concentration quenching of emission. Radiative and non-radiative transition rates, the quantum efficiency of emission, Omega-intensity parameters, and branching ratios of Eu3+ emission are calculated for nanocrystals of all doping concentrations. It is found that more to-the-point expression 86% of emission comes from D-5(0) - GT F-7(2) and D-5(0) - GT F-7(1) transitions. Therefore, this phosphor emits pure red light with (0.661, 0.338) CIE color coordinates. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Detailed study of structural and luminescent properties of Y2-xEuxZr2O7 (0 LT = x LT = 1) nanophosphors",
volume = "712",
pages = "437-444",
doi = "10.1016/j.jallcom.2017.04.139"
}
Papan, J., Vuković, K., Ahrenkiel, S. P., Jovanović, D. J.,& Dramićanin, M.. (2017). Detailed study of structural and luminescent properties of Y2-xEuxZr2O7 (0 LT = x LT = 1) nanophosphors. in Journal of Alloys and Compounds, 712, 437-444.
https://doi.org/10.1016/j.jallcom.2017.04.139
Papan J, Vuković K, Ahrenkiel SP, Jovanović DJ, Dramićanin M. Detailed study of structural and luminescent properties of Y2-xEuxZr2O7 (0 LT = x LT = 1) nanophosphors. in Journal of Alloys and Compounds. 2017;712:437-444.
doi:10.1016/j.jallcom.2017.04.139 .
Papan, Jelena, Vuković, Katarina, Ahrenkiel, Scott Phillip, Jovanović, Dragana J., Dramićanin, Miroslav, "Detailed study of structural and luminescent properties of Y2-xEuxZr2O7 (0 LT = x LT = 1) nanophosphors" in Journal of Alloys and Compounds, 712 (2017):437-444,
https://doi.org/10.1016/j.jallcom.2017.04.139 . .
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The photocatalytic performance of silver halides - Silver carbonate heterostructures

Dostanic, Jasmina; Lončarević, Davor; Đorđević, Vesna R.; Ahrenkiel, Scott Phillip; Nedeljković, Jovan

(2017)

TY  - JOUR
AU  - Dostanic, Jasmina
AU  - Lončarević, Davor
AU  - Đorđević, Vesna R.
AU  - Ahrenkiel, Scott Phillip
AU  - Nedeljković, Jovan
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1425
AB  - The synthesized rod-like Ag2CO3 particles (2-4 x 0.3-0.6 mu m, length x diameter) served as a precursor for preparation of the AgX/Ag2CO3 (X = CI, I) composites by ion exchange method. The various microstructural (X-ray diffraction analysis, transmission electron microscopy, nitrogen adsorption desorption isotherms) and optical (diffuse reflection spectroscopy) techniques were used for thorough characterization of obtained heterostructures. The enhanced photocatalytic performance of AgX/Ag2CO3 heterostructures in comparison to Ag2CO3 nanorods (NRs) was evidenced using degradation of organic dye methylene blue as a test reaction. Also, the formation of composites improved their stability under long run illumination conditions. The effect of AgX content on photocatalytic activity of the composites were also investigated. The possible photocatalytic mechanism that facilitates efficient separation of photo-formed charge carriers in heterostructures was discussed in terms of the relative energetic of valence and conduction bands. (C) 2016 Elsevier B.V. All rights reserved.
T2  - Journal of Photochemistry and Photobiology. A: Chemistry
T1  - The photocatalytic performance of silver halides - Silver carbonate heterostructures
VL  - 336
SP  - 1
EP  - 7
DO  - 10.1016/j.jphotochem.2016.12.019
ER  - 
@article{
author = "Dostanic, Jasmina and Lončarević, Davor and Đorđević, Vesna R. and Ahrenkiel, Scott Phillip and Nedeljković, Jovan",
year = "2017",
abstract = "The synthesized rod-like Ag2CO3 particles (2-4 x 0.3-0.6 mu m, length x diameter) served as a precursor for preparation of the AgX/Ag2CO3 (X = CI, I) composites by ion exchange method. The various microstructural (X-ray diffraction analysis, transmission electron microscopy, nitrogen adsorption desorption isotherms) and optical (diffuse reflection spectroscopy) techniques were used for thorough characterization of obtained heterostructures. The enhanced photocatalytic performance of AgX/Ag2CO3 heterostructures in comparison to Ag2CO3 nanorods (NRs) was evidenced using degradation of organic dye methylene blue as a test reaction. Also, the formation of composites improved their stability under long run illumination conditions. The effect of AgX content on photocatalytic activity of the composites were also investigated. The possible photocatalytic mechanism that facilitates efficient separation of photo-formed charge carriers in heterostructures was discussed in terms of the relative energetic of valence and conduction bands. (C) 2016 Elsevier B.V. All rights reserved.",
journal = "Journal of Photochemistry and Photobiology. A: Chemistry",
title = "The photocatalytic performance of silver halides - Silver carbonate heterostructures",
volume = "336",
pages = "1-7",
doi = "10.1016/j.jphotochem.2016.12.019"
}
Dostanic, J., Lončarević, D., Đorđević, V. R., Ahrenkiel, S. P.,& Nedeljković, J.. (2017). The photocatalytic performance of silver halides - Silver carbonate heterostructures. in Journal of Photochemistry and Photobiology. A: Chemistry, 336, 1-7.
https://doi.org/10.1016/j.jphotochem.2016.12.019
Dostanic J, Lončarević D, Đorđević VR, Ahrenkiel SP, Nedeljković J. The photocatalytic performance of silver halides - Silver carbonate heterostructures. in Journal of Photochemistry and Photobiology. A: Chemistry. 2017;336:1-7.
doi:10.1016/j.jphotochem.2016.12.019 .
Dostanic, Jasmina, Lončarević, Davor, Đorđević, Vesna R., Ahrenkiel, Scott Phillip, Nedeljković, Jovan, "The photocatalytic performance of silver halides - Silver carbonate heterostructures" in Journal of Photochemistry and Photobiology. A: Chemistry, 336 (2017):1-7,
https://doi.org/10.1016/j.jphotochem.2016.12.019 . .
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Photocatalytic Ability of Visible-Light-Responsive TiO2 Nanoparticles

Vukoje, Ivana D.; Kovač, Tijana S.; Džunuzović, Jasna V.; Džunuzović, Enis S.; Lončarević, Davor; Ahrenkiel, Scott Phillip; Nedeljković, Jovan

(2016)

TY  - JOUR
AU  - Vukoje, Ivana D.
AU  - Kovač, Tijana S.
AU  - Džunuzović, Jasna V.
AU  - Džunuzović, Enis S.
AU  - Lončarević, Davor
AU  - Ahrenkiel, Scott Phillip
AU  - Nedeljković, Jovan
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1221
AB  - The synthetic procedures for preparation of free-standing and attached to polymer support surface modified TiO2 nanoparticles (NPs) with absorption extended into the visible spectral region due to charge transfer complex formation were developed. The one-step synthesis of colloids consisting of surface-modified TiO2 NPs is based on the reaction between titanium(IV) isopropoxide (TTIP) and lauryl galatte in nonprotic organic solvents (tetrahydrofuran, xylol, chloroform). The poly(GMA-co-EGDMA) copolymer decorated with surface-modified TiO2 NPs was obtained in two steps. First, copolymer was functionalized with dopamine and then treated with TTIP in organic solvent at slightly elevated temperature. Thorough microstructural and optical characterization of free-standing and attached to polymer support surface-modified TiO2 NPs was performed involving transmission electron microscopy as well as absorption and reflection spectroscopy. Infrared spectroscopy was used to understand coordination of ligands to surface Ti atoms. Photoredox chemistry of surface-modified TiO2 NPs attached to the polymer support was tested. Enhanced photooxidative ability of composite was demonstrated by degradation of organic dye crystal violet under visible light illumination, i.e., using photons with energy smaller than 2.75 eV. On the other hand, photocatalytic hydrogen production was used to demonstrate photoreduction ability of surface modified TiO2 NPs attached to the polymer support.
T2  - Journal of Physical Chemistry. C
T1  - Photocatalytic Ability of Visible-Light-Responsive TiO2 Nanoparticles
VL  - 120
IS  - 33
SP  - 18560
EP  - 18569
DO  - 10.1021/acs.jpcc.6b04293
ER  - 
@article{
author = "Vukoje, Ivana D. and Kovač, Tijana S. and Džunuzović, Jasna V. and Džunuzović, Enis S. and Lončarević, Davor and Ahrenkiel, Scott Phillip and Nedeljković, Jovan",
year = "2016",
abstract = "The synthetic procedures for preparation of free-standing and attached to polymer support surface modified TiO2 nanoparticles (NPs) with absorption extended into the visible spectral region due to charge transfer complex formation were developed. The one-step synthesis of colloids consisting of surface-modified TiO2 NPs is based on the reaction between titanium(IV) isopropoxide (TTIP) and lauryl galatte in nonprotic organic solvents (tetrahydrofuran, xylol, chloroform). The poly(GMA-co-EGDMA) copolymer decorated with surface-modified TiO2 NPs was obtained in two steps. First, copolymer was functionalized with dopamine and then treated with TTIP in organic solvent at slightly elevated temperature. Thorough microstructural and optical characterization of free-standing and attached to polymer support surface-modified TiO2 NPs was performed involving transmission electron microscopy as well as absorption and reflection spectroscopy. Infrared spectroscopy was used to understand coordination of ligands to surface Ti atoms. Photoredox chemistry of surface-modified TiO2 NPs attached to the polymer support was tested. Enhanced photooxidative ability of composite was demonstrated by degradation of organic dye crystal violet under visible light illumination, i.e., using photons with energy smaller than 2.75 eV. On the other hand, photocatalytic hydrogen production was used to demonstrate photoreduction ability of surface modified TiO2 NPs attached to the polymer support.",
journal = "Journal of Physical Chemistry. C",
title = "Photocatalytic Ability of Visible-Light-Responsive TiO2 Nanoparticles",
volume = "120",
number = "33",
pages = "18560-18569",
doi = "10.1021/acs.jpcc.6b04293"
}
Vukoje, I. D., Kovač, T. S., Džunuzović, J. V., Džunuzović, E. S., Lončarević, D., Ahrenkiel, S. P.,& Nedeljković, J.. (2016). Photocatalytic Ability of Visible-Light-Responsive TiO2 Nanoparticles. in Journal of Physical Chemistry. C, 120(33), 18560-18569.
https://doi.org/10.1021/acs.jpcc.6b04293
Vukoje ID, Kovač TS, Džunuzović JV, Džunuzović ES, Lončarević D, Ahrenkiel SP, Nedeljković J. Photocatalytic Ability of Visible-Light-Responsive TiO2 Nanoparticles. in Journal of Physical Chemistry. C. 2016;120(33):18560-18569.
doi:10.1021/acs.jpcc.6b04293 .
Vukoje, Ivana D., Kovač, Tijana S., Džunuzović, Jasna V., Džunuzović, Enis S., Lončarević, Davor, Ahrenkiel, Scott Phillip, Nedeljković, Jovan, "Photocatalytic Ability of Visible-Light-Responsive TiO2 Nanoparticles" in Journal of Physical Chemistry. C, 120, no. 33 (2016):18560-18569,
https://doi.org/10.1021/acs.jpcc.6b04293 . .
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Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration

Vranješ, Mila; Kuljanin-Jakovljević, Jadranka Ž.; Konstantinović, Zorica; Pomar, Alberto; Ahrenkiel, Scott Phillip; Radetic, Tamara; Stoiljković, Milovan; Mitrić, Miodrag; Šaponjić, Zoran

(Elsevier, 2016)

TY  - JOUR
AU  - Vranješ, Mila
AU  - Kuljanin-Jakovljević, Jadranka Ž.
AU  - Konstantinović, Zorica
AU  - Pomar, Alberto
AU  - Ahrenkiel, Scott Phillip
AU  - Radetic, Tamara
AU  - Stoiljković, Milovan
AU  - Mitrić, Miodrag
AU  - Šaponjić, Zoran
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1024
AB  - Cu2+ doped TiO2 nanocrystals were synthesized using dispersions of titania nanotubes in the presence of Cu2+ ions as a precursors. The morphologies of nanotubular titania precursors and resulted Cu2+ doped TiO2 nanocrystals were characterized by TEM. Structural and optical properties were studied by XRPD analysis and UV-vis spectroscopy in reflectance mode, respectively. Their magnetic properties were investigated using SQUID magnetometer. Tetragonal anatase crystalline structure was confirmed in all synthesized samples. Polygonal (d similar to 15 nm) and spheroid like (length, up to 90 nm) Cu2+ doped TiO2 nanocrystals in samples synthesized at different pHs were observed by TEM. Ferromagnetic ordering with almost closed loop (H-c similar to 200 Oe) was detected in all Cu2+ doped TiO2 nanoparticle films. The saturation magnetization values varied depending on the Cu2+ concentration, nanoparticles shape, size and consequently different number of oxygen vacancies. This study revealed possibility to control magnetic ordering by changing the shape/aspect ratio of Cu2+ doped TiO2 nanocrystals. (C) 2015 Elsevier Ltd. All rights reserved.
PB  - Elsevier
T2  - Materials Research Bulletin
T1  - Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration
VL  - 76
SP  - 100
EP  - 106
DO  - 10.1016/j.materresbull.2015.11.051
ER  - 
@article{
author = "Vranješ, Mila and Kuljanin-Jakovljević, Jadranka Ž. and Konstantinović, Zorica and Pomar, Alberto and Ahrenkiel, Scott Phillip and Radetic, Tamara and Stoiljković, Milovan and Mitrić, Miodrag and Šaponjić, Zoran",
year = "2016",
abstract = "Cu2+ doped TiO2 nanocrystals were synthesized using dispersions of titania nanotubes in the presence of Cu2+ ions as a precursors. The morphologies of nanotubular titania precursors and resulted Cu2+ doped TiO2 nanocrystals were characterized by TEM. Structural and optical properties were studied by XRPD analysis and UV-vis spectroscopy in reflectance mode, respectively. Their magnetic properties were investigated using SQUID magnetometer. Tetragonal anatase crystalline structure was confirmed in all synthesized samples. Polygonal (d similar to 15 nm) and spheroid like (length, up to 90 nm) Cu2+ doped TiO2 nanocrystals in samples synthesized at different pHs were observed by TEM. Ferromagnetic ordering with almost closed loop (H-c similar to 200 Oe) was detected in all Cu2+ doped TiO2 nanoparticle films. The saturation magnetization values varied depending on the Cu2+ concentration, nanoparticles shape, size and consequently different number of oxygen vacancies. This study revealed possibility to control magnetic ordering by changing the shape/aspect ratio of Cu2+ doped TiO2 nanocrystals. (C) 2015 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier",
journal = "Materials Research Bulletin",
title = "Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration",
volume = "76",
pages = "100-106",
doi = "10.1016/j.materresbull.2015.11.051"
}
Vranješ, M., Kuljanin-Jakovljević, J. Ž., Konstantinović, Z., Pomar, A., Ahrenkiel, S. P., Radetic, T., Stoiljković, M., Mitrić, M.,& Šaponjić, Z.. (2016). Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration. in Materials Research Bulletin
Elsevier., 76, 100-106.
https://doi.org/10.1016/j.materresbull.2015.11.051
Vranješ M, Kuljanin-Jakovljević JŽ, Konstantinović Z, Pomar A, Ahrenkiel SP, Radetic T, Stoiljković M, Mitrić M, Šaponjić Z. Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration. in Materials Research Bulletin. 2016;76:100-106.
doi:10.1016/j.materresbull.2015.11.051 .
Vranješ, Mila, Kuljanin-Jakovljević, Jadranka Ž., Konstantinović, Zorica, Pomar, Alberto, Ahrenkiel, Scott Phillip, Radetic, Tamara, Stoiljković, Milovan, Mitrić, Miodrag, Šaponjić, Zoran, "Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration" in Materials Research Bulletin, 76 (2016):100-106,
https://doi.org/10.1016/j.materresbull.2015.11.051 . .
7
7
7

Effect of annealing on luminescence of Eu3+- and Sm3+-doped Mg2TiO4 nanoparticles

Medić, Mina M.; Antić, Željka; Đorđević, Vesna R.; Ahrenkiel, Scott Phillip; Marinović-Cincović, Milena; Dramićanin, Miroslav

(Elsevier, 2016)

TY  - JOUR
AU  - Medić, Mina M.
AU  - Antić, Željka
AU  - Đorđević, Vesna R.
AU  - Ahrenkiel, Scott Phillip
AU  - Marinović-Cincović, Milena
AU  - Dramićanin, Miroslav
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/879
AB  - This work explores the influence of annealing temperature on the structure and luminescence of 2 at% Eu3+ and 1 at Sm3+-doped Mg2TiO4 nanopowders produced via Pechini-type polymerized complex route. Mg2TiO4 samples were annealed at 7 different temperatures (400 degrees C, 450 degrees C, 500 degrees C, 550 degrees C, 600 degrees C, 650 degrees C and 700 degrees C) to determine the temperature range in which cubic inverse spinel structure is stable and to follow the changes of material luminescence properties. X-ray diffraction revealed that crystallization of both Eu3+ and Sm3+-doped Mg2TiO4 nanopowders starts at 400 degrees C, and that Sm3+ doped Mg2TiO4 starts to decompose at 650 degrees C, while Eu3+ doped Mg2TiO4 starts to decompose at 700 degrees C. Samples annealed at higher temperatures show higher crystallinity and larger crystallite size. Mg2TiO4 powder annealed at 600 degrees C is composed of similar to 5 nm size nanoparticles agglomerated in micron-size and dense chunks. The emission spectra of nanoparticles are composed of emissions from defects in Mg2TiO4 host and characteristic emissions of Eu3+ (D-5(0) - GT F-7(J)) and Sm3+ ((4)G(5/2) - GT H-6(J)) ions. The stronger emission and longer emission decays are observed with samples annealed at high temperatures. In the case of the Eu3+ ions emission intensity increased one order of magnitude between samples annealed at 400 degrees C and 650 degrees C. (C) 2015 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Journal of Luminescence
T1  - Effect of annealing on luminescence of Eu3+- and Sm3+-doped Mg2TiO4 nanoparticles
VL  - 170
IS  - SI
SP  - 679
EP  - 685
DO  - 10.1016/j.jlumin.2015.06.007
ER  - 
@article{
author = "Medić, Mina M. and Antić, Željka and Đorđević, Vesna R. and Ahrenkiel, Scott Phillip and Marinović-Cincović, Milena and Dramićanin, Miroslav",
year = "2016",
abstract = "This work explores the influence of annealing temperature on the structure and luminescence of 2 at% Eu3+ and 1 at Sm3+-doped Mg2TiO4 nanopowders produced via Pechini-type polymerized complex route. Mg2TiO4 samples were annealed at 7 different temperatures (400 degrees C, 450 degrees C, 500 degrees C, 550 degrees C, 600 degrees C, 650 degrees C and 700 degrees C) to determine the temperature range in which cubic inverse spinel structure is stable and to follow the changes of material luminescence properties. X-ray diffraction revealed that crystallization of both Eu3+ and Sm3+-doped Mg2TiO4 nanopowders starts at 400 degrees C, and that Sm3+ doped Mg2TiO4 starts to decompose at 650 degrees C, while Eu3+ doped Mg2TiO4 starts to decompose at 700 degrees C. Samples annealed at higher temperatures show higher crystallinity and larger crystallite size. Mg2TiO4 powder annealed at 600 degrees C is composed of similar to 5 nm size nanoparticles agglomerated in micron-size and dense chunks. The emission spectra of nanoparticles are composed of emissions from defects in Mg2TiO4 host and characteristic emissions of Eu3+ (D-5(0) - GT F-7(J)) and Sm3+ ((4)G(5/2) - GT H-6(J)) ions. The stronger emission and longer emission decays are observed with samples annealed at high temperatures. In the case of the Eu3+ ions emission intensity increased one order of magnitude between samples annealed at 400 degrees C and 650 degrees C. (C) 2015 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Journal of Luminescence",
title = "Effect of annealing on luminescence of Eu3+- and Sm3+-doped Mg2TiO4 nanoparticles",
volume = "170",
number = "SI",
pages = "679-685",
doi = "10.1016/j.jlumin.2015.06.007"
}
Medić, M. M., Antić, Ž., Đorđević, V. R., Ahrenkiel, S. P., Marinović-Cincović, M.,& Dramićanin, M.. (2016). Effect of annealing on luminescence of Eu3+- and Sm3+-doped Mg2TiO4 nanoparticles. in Journal of Luminescence
Elsevier., 170(SI), 679-685.
https://doi.org/10.1016/j.jlumin.2015.06.007
Medić MM, Antić Ž, Đorđević VR, Ahrenkiel SP, Marinović-Cincović M, Dramićanin M. Effect of annealing on luminescence of Eu3+- and Sm3+-doped Mg2TiO4 nanoparticles. in Journal of Luminescence. 2016;170(SI):679-685.
doi:10.1016/j.jlumin.2015.06.007 .
Medić, Mina M., Antić, Željka, Đorđević, Vesna R., Ahrenkiel, Scott Phillip, Marinović-Cincović, Milena, Dramićanin, Miroslav, "Effect of annealing on luminescence of Eu3+- and Sm3+-doped Mg2TiO4 nanoparticles" in Journal of Luminescence, 170, no. SI (2016):679-685,
https://doi.org/10.1016/j.jlumin.2015.06.007 . .
6
6
6

Non-contact thermometry with Dy3+ doped Gd2Ti2O7 nano-powders

Ćulubrk, Sanja; Lojpur, Vesna; Ahrenkiel, Scott Phillip; Nedeljković, Jovan; Dramićanin, Miroslav

(Elsevier, 2016)

TY  - JOUR
AU  - Ćulubrk, Sanja
AU  - Lojpur, Vesna
AU  - Ahrenkiel, Scott Phillip
AU  - Nedeljković, Jovan
AU  - Dramićanin, Miroslav
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/877
AB  - The performance of Dy3+ doped Gd2Ti2O7 nano-powders for luminescence temperature sensing was tested over a temperature range from 293 to 443 K. The Dy3+ ions were incorporated into Gd2Ti2O7 nanocrystals using a hydrolytic sal-gel route. Microstructural characterization of the obtained material was performed using transmission electron microscopy and X-ray diffraction measurements. Luminescence spectra of Dy3+ doped Gd2Ti2O7 nano-powders consists of two distinct spectral regions: the highenergy region associated with the trap emission of the Gd2Ti2O7 host and the low-energy region with well-resolved emission peaks of the Dy3+ ions. The ratio between intensities of two Dy3+ emission lines, as well as the ratio between intensities of trap emission of host and Dy3+ emission show strong temperature dependence and are tested for temperature sensing. In both cases, ratiometric measurements provide comparable quality of temperature sensing, and when they are combined the relative sensor sensitivities were found to be higher than 0.9% K-1 over given temperature range. The fluorescence quenching of Dy3+ ions was discussed in terms of simple theoretical models. (C) 2015 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Journal of Luminescence
T1  - Non-contact thermometry with Dy3+ doped Gd2Ti2O7 nano-powders
VL  - 170
IS  - SI
SP  - 395
EP  - 400
DO  - 10.1016/j.jlumin.2015.06.006
ER  - 
@article{
author = "Ćulubrk, Sanja and Lojpur, Vesna and Ahrenkiel, Scott Phillip and Nedeljković, Jovan and Dramićanin, Miroslav",
year = "2016",
abstract = "The performance of Dy3+ doped Gd2Ti2O7 nano-powders for luminescence temperature sensing was tested over a temperature range from 293 to 443 K. The Dy3+ ions were incorporated into Gd2Ti2O7 nanocrystals using a hydrolytic sal-gel route. Microstructural characterization of the obtained material was performed using transmission electron microscopy and X-ray diffraction measurements. Luminescence spectra of Dy3+ doped Gd2Ti2O7 nano-powders consists of two distinct spectral regions: the highenergy region associated with the trap emission of the Gd2Ti2O7 host and the low-energy region with well-resolved emission peaks of the Dy3+ ions. The ratio between intensities of two Dy3+ emission lines, as well as the ratio between intensities of trap emission of host and Dy3+ emission show strong temperature dependence and are tested for temperature sensing. In both cases, ratiometric measurements provide comparable quality of temperature sensing, and when they are combined the relative sensor sensitivities were found to be higher than 0.9% K-1 over given temperature range. The fluorescence quenching of Dy3+ ions was discussed in terms of simple theoretical models. (C) 2015 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Journal of Luminescence",
title = "Non-contact thermometry with Dy3+ doped Gd2Ti2O7 nano-powders",
volume = "170",
number = "SI",
pages = "395-400",
doi = "10.1016/j.jlumin.2015.06.006"
}
Ćulubrk, S., Lojpur, V., Ahrenkiel, S. P., Nedeljković, J.,& Dramićanin, M.. (2016). Non-contact thermometry with Dy3+ doped Gd2Ti2O7 nano-powders. in Journal of Luminescence
Elsevier., 170(SI), 395-400.
https://doi.org/10.1016/j.jlumin.2015.06.006
Ćulubrk S, Lojpur V, Ahrenkiel SP, Nedeljković J, Dramićanin M. Non-contact thermometry with Dy3+ doped Gd2Ti2O7 nano-powders. in Journal of Luminescence. 2016;170(SI):395-400.
doi:10.1016/j.jlumin.2015.06.006 .
Ćulubrk, Sanja, Lojpur, Vesna, Ahrenkiel, Scott Phillip, Nedeljković, Jovan, Dramićanin, Miroslav, "Non-contact thermometry with Dy3+ doped Gd2Ti2O7 nano-powders" in Journal of Luminescence, 170, no. SI (2016):395-400,
https://doi.org/10.1016/j.jlumin.2015.06.006 . .
51
45
48

Spherical assemblies of titania nanotubes generated through aerosol processing

Jovanović, Dragana J.; Dugandzic, Ivan M.; Ćirić-Marjanović, Gordana N.; Radetic, Tamara; Ahrenkiel, Scott Phillip; Milosevic, Olivera B.; Nedeljković, Jovan; Šaponjić, Zoran; Mančić, Lidija

(2015)

TY  - JOUR
AU  - Jovanović, Dragana J.
AU  - Dugandzic, Ivan M.
AU  - Ćirić-Marjanović, Gordana N.
AU  - Radetic, Tamara
AU  - Ahrenkiel, Scott Phillip
AU  - Milosevic, Olivera B.
AU  - Nedeljković, Jovan
AU  - Šaponjić, Zoran
AU  - Mančić, Lidija
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/771
AB  - We report on the possibility to build hierarchically organized three-dimensional (3D) titania spherical particles having high surface-to-volume-ratio, by aerosol processing of nanotubular building blocks. Morphology and crystal structure of titania based spherical assemblies, obtained in the temperature range from 150 to 650 degrees C, were characterized by means of scanning and transmission electron microscopy, x-ray powder diffraction and Raman spectroscopy. Initial shape of 1D building units, nanotubes, was well preserved in the spherical assemblies processed at 150 and 450 degrees C. Processing at 650 degrees C resulted in a collapse of the nanotubular building blocks and formation of the assemblies of irregularly shaped TiO2 nanoparticles. Structural analysis revealed several phase transitions in titania spherical assemblies in course with the temperature increase indicating possibility of in-situ phase composition adjustment during aerosol processing. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Spherical assemblies of titania nanotubes generated through aerosol processing
VL  - 41
IS  - 10
SP  - 14754
EP  - 14759
DO  - 10.1016/j.ceramint.2015.07.205
ER  - 
@article{
author = "Jovanović, Dragana J. and Dugandzic, Ivan M. and Ćirić-Marjanović, Gordana N. and Radetic, Tamara and Ahrenkiel, Scott Phillip and Milosevic, Olivera B. and Nedeljković, Jovan and Šaponjić, Zoran and Mančić, Lidija",
year = "2015",
abstract = "We report on the possibility to build hierarchically organized three-dimensional (3D) titania spherical particles having high surface-to-volume-ratio, by aerosol processing of nanotubular building blocks. Morphology and crystal structure of titania based spherical assemblies, obtained in the temperature range from 150 to 650 degrees C, were characterized by means of scanning and transmission electron microscopy, x-ray powder diffraction and Raman spectroscopy. Initial shape of 1D building units, nanotubes, was well preserved in the spherical assemblies processed at 150 and 450 degrees C. Processing at 650 degrees C resulted in a collapse of the nanotubular building blocks and formation of the assemblies of irregularly shaped TiO2 nanoparticles. Structural analysis revealed several phase transitions in titania spherical assemblies in course with the temperature increase indicating possibility of in-situ phase composition adjustment during aerosol processing. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Spherical assemblies of titania nanotubes generated through aerosol processing",
volume = "41",
number = "10",
pages = "14754-14759",
doi = "10.1016/j.ceramint.2015.07.205"
}
Jovanović, D. J., Dugandzic, I. M., Ćirić-Marjanović, G. N., Radetic, T., Ahrenkiel, S. P., Milosevic, O. B., Nedeljković, J., Šaponjić, Z.,& Mančić, L.. (2015). Spherical assemblies of titania nanotubes generated through aerosol processing. in Ceramics International, 41(10), 14754-14759.
https://doi.org/10.1016/j.ceramint.2015.07.205
Jovanović DJ, Dugandzic IM, Ćirić-Marjanović GN, Radetic T, Ahrenkiel SP, Milosevic OB, Nedeljković J, Šaponjić Z, Mančić L. Spherical assemblies of titania nanotubes generated through aerosol processing. in Ceramics International. 2015;41(10):14754-14759.
doi:10.1016/j.ceramint.2015.07.205 .
Jovanović, Dragana J., Dugandzic, Ivan M., Ćirić-Marjanović, Gordana N., Radetic, Tamara, Ahrenkiel, Scott Phillip, Milosevic, Olivera B., Nedeljković, Jovan, Šaponjić, Zoran, Mančić, Lidija, "Spherical assemblies of titania nanotubes generated through aerosol processing" in Ceramics International, 41, no. 10 (2015):14754-14759,
https://doi.org/10.1016/j.ceramint.2015.07.205 . .
1
3
2
2

Visible light absorption of surface modified TiO2 powders with bidentate benzene derivatives

Milićević, Bojana R.; Đorđević, Vesna R.; Lončarević, Davor; Ahrenkiel, Scott Phillip; Dramićanin, Miroslav; Nedeljković, Jovan

(2015)

TY  - JOUR
AU  - Milićević, Bojana R.
AU  - Đorđević, Vesna R.
AU  - Lončarević, Davor
AU  - Ahrenkiel, Scott Phillip
AU  - Dramićanin, Miroslav
AU  - Nedeljković, Jovan
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/719
AB  - TiO2 powders with different specific surface area were prepared using reproducible, sol gel synthetic route and their ability to form hybrids with catechol and 5-amino salicylic acid was compared with the commercially available Degussa P25 TiO2 powder. Microstructural characterization involving transmission electron microscopy, X-ray diffraction analysis and nitrogen adsorption-desorption isotherms indicated that TiO2 samples cover reasonably wide size and/or specific surface area range (50-115 m(2)/g). The surface modification of TiO2 powders with catechol and 5-amino salicylic acid induced significant shift of absorption to the visible spectral region due to charge transfer complex formation. It should be emphasized that tunable optical properties of TiO2 in powder form have never been reported in the literature. The largest red shift of the absorption onset was observed for sample with the largest specific surface area upon surface modification with both ligands. The binding of the modifier molecules to the surface Ti atoms was studied using Fourier transform infrared spectroscopy. (C) 2015 Elsevier Inc. All rights reserved.
T2  - Microporous and Mesoporous Materials
T1  - Visible light absorption of surface modified TiO2 powders with bidentate benzene derivatives
VL  - 217
SP  - 184
EP  - 189
DO  - 10.1016/j.micromeso.2015.06.028
ER  - 
@article{
author = "Milićević, Bojana R. and Đorđević, Vesna R. and Lončarević, Davor and Ahrenkiel, Scott Phillip and Dramićanin, Miroslav and Nedeljković, Jovan",
year = "2015",
abstract = "TiO2 powders with different specific surface area were prepared using reproducible, sol gel synthetic route and their ability to form hybrids with catechol and 5-amino salicylic acid was compared with the commercially available Degussa P25 TiO2 powder. Microstructural characterization involving transmission electron microscopy, X-ray diffraction analysis and nitrogen adsorption-desorption isotherms indicated that TiO2 samples cover reasonably wide size and/or specific surface area range (50-115 m(2)/g). The surface modification of TiO2 powders with catechol and 5-amino salicylic acid induced significant shift of absorption to the visible spectral region due to charge transfer complex formation. It should be emphasized that tunable optical properties of TiO2 in powder form have never been reported in the literature. The largest red shift of the absorption onset was observed for sample with the largest specific surface area upon surface modification with both ligands. The binding of the modifier molecules to the surface Ti atoms was studied using Fourier transform infrared spectroscopy. (C) 2015 Elsevier Inc. All rights reserved.",
journal = "Microporous and Mesoporous Materials",
title = "Visible light absorption of surface modified TiO2 powders with bidentate benzene derivatives",
volume = "217",
pages = "184-189",
doi = "10.1016/j.micromeso.2015.06.028"
}
Milićević, B. R., Đorđević, V. R., Lončarević, D., Ahrenkiel, S. P., Dramićanin, M.,& Nedeljković, J.. (2015). Visible light absorption of surface modified TiO2 powders with bidentate benzene derivatives. in Microporous and Mesoporous Materials, 217, 184-189.
https://doi.org/10.1016/j.micromeso.2015.06.028
Milićević BR, Đorđević VR, Lončarević D, Ahrenkiel SP, Dramićanin M, Nedeljković J. Visible light absorption of surface modified TiO2 powders with bidentate benzene derivatives. in Microporous and Mesoporous Materials. 2015;217:184-189.
doi:10.1016/j.micromeso.2015.06.028 .
Milićević, Bojana R., Đorđević, Vesna R., Lončarević, Davor, Ahrenkiel, Scott Phillip, Dramićanin, Miroslav, Nedeljković, Jovan, "Visible light absorption of surface modified TiO2 powders with bidentate benzene derivatives" in Microporous and Mesoporous Materials, 217 (2015):184-189,
https://doi.org/10.1016/j.micromeso.2015.06.028 . .
3
31
29
30

The influence of reaction media on CdIn2S4 and ZnIn2S4 nanocrystallite formation and growth of mesocrystal structures

Carević, Milica V.; Čomor, Mirjana; Mitrić, Miodrag; Barudžija, Tanja; Ahrenkiel, Scott Phillip; Abazović, Nadica

(2015)

TY  - JOUR
AU  - Carević, Milica V.
AU  - Čomor, Mirjana
AU  - Mitrić, Miodrag
AU  - Barudžija, Tanja
AU  - Ahrenkiel, Scott Phillip
AU  - Abazović, Nadica
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/804
AB  - A hot-injection method for the synthesis of CdIn2S4 in three different compositions of organic media/solvents was studied. Nanosized CdIn2S4 is successfully synthesized in an oleic acid/oleylamine mixture of complexing/capping agents. The obtained mesocrystals of 20-30 nm in diameter are self-organized in marigold-like structures. The estimated band-gap of synthesized semiconductor is in the visible spectral region and has a value of about 2.1 eV. The potential of the band edges is calculated using an empirical equation. The as-prepared material was successfully transferred from organic to aqueous media by using 2-mercaptoethanol in a surface ligand exchange process. Using a similar synthetic procedure, ZnIn2S4 synthesis was performed. The obtained materials were characterized using UV/vis spectroscopy, XRD and TEM. Formation and growth mechanisms of the synthesized materials are proposed.
T2  - CrystEngComm
T1  - The influence of reaction media on CdIn2S4 and ZnIn2S4 nanocrystallite formation and growth of mesocrystal structures
VL  - 17
IS  - 44
SP  - 8492
EP  - 8499
DO  - 10.1039/c5ce01432h
ER  - 
@article{
author = "Carević, Milica V. and Čomor, Mirjana and Mitrić, Miodrag and Barudžija, Tanja and Ahrenkiel, Scott Phillip and Abazović, Nadica",
year = "2015",
abstract = "A hot-injection method for the synthesis of CdIn2S4 in three different compositions of organic media/solvents was studied. Nanosized CdIn2S4 is successfully synthesized in an oleic acid/oleylamine mixture of complexing/capping agents. The obtained mesocrystals of 20-30 nm in diameter are self-organized in marigold-like structures. The estimated band-gap of synthesized semiconductor is in the visible spectral region and has a value of about 2.1 eV. The potential of the band edges is calculated using an empirical equation. The as-prepared material was successfully transferred from organic to aqueous media by using 2-mercaptoethanol in a surface ligand exchange process. Using a similar synthetic procedure, ZnIn2S4 synthesis was performed. The obtained materials were characterized using UV/vis spectroscopy, XRD and TEM. Formation and growth mechanisms of the synthesized materials are proposed.",
journal = "CrystEngComm",
title = "The influence of reaction media on CdIn2S4 and ZnIn2S4 nanocrystallite formation and growth of mesocrystal structures",
volume = "17",
number = "44",
pages = "8492-8499",
doi = "10.1039/c5ce01432h"
}
Carević, M. V., Čomor, M., Mitrić, M., Barudžija, T., Ahrenkiel, S. P.,& Abazović, N.. (2015). The influence of reaction media on CdIn2S4 and ZnIn2S4 nanocrystallite formation and growth of mesocrystal structures. in CrystEngComm, 17(44), 8492-8499.
https://doi.org/10.1039/c5ce01432h
Carević MV, Čomor M, Mitrić M, Barudžija T, Ahrenkiel SP, Abazović N. The influence of reaction media on CdIn2S4 and ZnIn2S4 nanocrystallite formation and growth of mesocrystal structures. in CrystEngComm. 2015;17(44):8492-8499.
doi:10.1039/c5ce01432h .
Carević, Milica V., Čomor, Mirjana, Mitrić, Miodrag, Barudžija, Tanja, Ahrenkiel, Scott Phillip, Abazović, Nadica, "The influence of reaction media on CdIn2S4 and ZnIn2S4 nanocrystallite formation and growth of mesocrystal structures" in CrystEngComm, 17, no. 44 (2015):8492-8499,
https://doi.org/10.1039/c5ce01432h . .
10
10
11

Interfacial Synthesis of Gold-Polyaniline Nanocomposite and Its Electrocatalytic Application

Bogdanović, Una; Pašti, Igor A.; Ćirić-Marjanović, Gordana N.; Mitrić, Miodrag; Ahrenkiel, Scott Phillip; Vodnik, Vesna

(2015)

TY  - JOUR
AU  - Bogdanović, Una
AU  - Pašti, Igor A.
AU  - Ćirić-Marjanović, Gordana N.
AU  - Mitrić, Miodrag
AU  - Ahrenkiel, Scott Phillip
AU  - Vodnik, Vesna
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/922
AB  - Gold-polyaniline (Au-PANI) nanocomposite was prepared using a simple interfacial polymerization method, performed in an immiscible water/toluene biphasic system using tetrachloroaurate, AuCl4- as an oxidant. The formation of Au+ nanoparticles (AuNPs) or Au-PANI nanocomposite can be controlled to a certain degree by varying the ratio of initial Au+ and aniline concentrations. Under optimal condition (HAuCl4/aniline ratio is 1:2), green dispersion of Au-PANI nanocomposite is produced in aqueous phase, whose morphology, structure and physicochemical properties are investigated in details. The nanocomposite shows granular morphology with mostly rodlike AuNPs embedded in polymer. It was found that polyaniline in the composite is in the conducting emeraldine salt form, containing high amount of Au (28.85 wt %). Furthermore, the electrical conductivity of the nanocomposite was found to be four-fold higher than that of the polymer itself. In addition, the nanocomposite powder, isolated from the as-prepared aqueous dispersion, can later be easily redispersed in water and further used for various applications. Moreover, the obtained Au-PANI nanocomposite showed excellent electrocatalytic performance toward the electrochemical oxygen reduction reaction (ORR), with high ORR onset potential and good selectivity. This makes it a promising candidate for a new class of Pt-free ORR. catalyst.
T2  - ACS Applied Materials and Interfaces
T1  - Interfacial Synthesis of Gold-Polyaniline Nanocomposite and Its Electrocatalytic Application
VL  - 7
IS  - 51
SP  - 28393
EP  - 28403
DO  - 10.1021/acsami.5b09145
ER  - 
@article{
author = "Bogdanović, Una and Pašti, Igor A. and Ćirić-Marjanović, Gordana N. and Mitrić, Miodrag and Ahrenkiel, Scott Phillip and Vodnik, Vesna",
year = "2015",
abstract = "Gold-polyaniline (Au-PANI) nanocomposite was prepared using a simple interfacial polymerization method, performed in an immiscible water/toluene biphasic system using tetrachloroaurate, AuCl4- as an oxidant. The formation of Au+ nanoparticles (AuNPs) or Au-PANI nanocomposite can be controlled to a certain degree by varying the ratio of initial Au+ and aniline concentrations. Under optimal condition (HAuCl4/aniline ratio is 1:2), green dispersion of Au-PANI nanocomposite is produced in aqueous phase, whose morphology, structure and physicochemical properties are investigated in details. The nanocomposite shows granular morphology with mostly rodlike AuNPs embedded in polymer. It was found that polyaniline in the composite is in the conducting emeraldine salt form, containing high amount of Au (28.85 wt %). Furthermore, the electrical conductivity of the nanocomposite was found to be four-fold higher than that of the polymer itself. In addition, the nanocomposite powder, isolated from the as-prepared aqueous dispersion, can later be easily redispersed in water and further used for various applications. Moreover, the obtained Au-PANI nanocomposite showed excellent electrocatalytic performance toward the electrochemical oxygen reduction reaction (ORR), with high ORR onset potential and good selectivity. This makes it a promising candidate for a new class of Pt-free ORR. catalyst.",
journal = "ACS Applied Materials and Interfaces",
title = "Interfacial Synthesis of Gold-Polyaniline Nanocomposite and Its Electrocatalytic Application",
volume = "7",
number = "51",
pages = "28393-28403",
doi = "10.1021/acsami.5b09145"
}
Bogdanović, U., Pašti, I. A., Ćirić-Marjanović, G. N., Mitrić, M., Ahrenkiel, S. P.,& Vodnik, V.. (2015). Interfacial Synthesis of Gold-Polyaniline Nanocomposite and Its Electrocatalytic Application. in ACS Applied Materials and Interfaces, 7(51), 28393-28403.
https://doi.org/10.1021/acsami.5b09145
Bogdanović U, Pašti IA, Ćirić-Marjanović GN, Mitrić M, Ahrenkiel SP, Vodnik V. Interfacial Synthesis of Gold-Polyaniline Nanocomposite and Its Electrocatalytic Application. in ACS Applied Materials and Interfaces. 2015;7(51):28393-28403.
doi:10.1021/acsami.5b09145 .
Bogdanović, Una, Pašti, Igor A., Ćirić-Marjanović, Gordana N., Mitrić, Miodrag, Ahrenkiel, Scott Phillip, Vodnik, Vesna, "Interfacial Synthesis of Gold-Polyaniline Nanocomposite and Its Electrocatalytic Application" in ACS Applied Materials and Interfaces, 7, no. 51 (2015):28393-28403,
https://doi.org/10.1021/acsami.5b09145 . .
3
88
81
86

Microstructural Analysis and the Multicolor UV/Violet/Blue/Green/Yellow PL Observed from the Synthesized ZnO Nano-leaves and Nano-rods

Validžić, Ivana Lj.; Mitrić, Miodrag; Ahrenkiel, Scott Phillip; Čomor, Mirjana

(2015)

TY  - JOUR
AU  - Validžić, Ivana Lj.
AU  - Mitrić, Miodrag
AU  - Ahrenkiel, Scott Phillip
AU  - Čomor, Mirjana
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/620
AB  - We report the synthesis of zinc oxide (ZnO) nano-leaves and nano-rods under high and extremely high alkaline experimental conditions, via a simple and low-temperature method. By performing transmission electron microscopy it is found that the nano-leaves and nano-rods grow along the (001) direction. Anisotropic, i.e., hkl-dependent line-shape broadening is observed in ZnO powder diffraction patterns. Rietveld analysis using Fullprof with model for handling the anisotropic size-like broadening is performed on these diffraction patterns. The refinement showed that ZnO powders belong to the hexagonal ZnS structure type with space group P63mc, and confirmed that the nano-leaves and nano-rods are oriented along the (001) direction. Results of visualization in 3D of the average crystallite shape obtained from refinement of spherical harmonics coefficients showed elongated shapes in the both samples, exhibiting a slight twisting for nano-leaves. Diffuse reflectance measurements reveal that the optical band-gap energies found for the ZnO nano-leaves and nano-rods is somewhat smaller than a wide-direct band gap of 3.37 eV. We argued that well defined and strong photoluminescence (PL) bands in the visible part that belong to the defects may influence the observed displacement of a ultraviolet (UV) near-band-edge emission, and which is related with obtained slightly lower band-gap energies than the established band gap of bulk ZnO. We discuss processes behind the multicolor UV/violet/blue/green/yellow emission band in PL spectra. (C) The Minerals, Metals and Materials Society and ASM International 2015
T2  - Metallurgical and Materials Transactions. A: Physical Metallurgy and Materials Science
T1  - Microstructural Analysis and the Multicolor UV/Violet/Blue/Green/Yellow PL Observed from the Synthesized ZnO Nano-leaves and Nano-rods
VL  - 46A
IS  - 8
SP  - 3679
EP  - 3686
DO  - 10.1007/s11661-015-2961-x
ER  - 
@article{
author = "Validžić, Ivana Lj. and Mitrić, Miodrag and Ahrenkiel, Scott Phillip and Čomor, Mirjana",
year = "2015",
abstract = "We report the synthesis of zinc oxide (ZnO) nano-leaves and nano-rods under high and extremely high alkaline experimental conditions, via a simple and low-temperature method. By performing transmission electron microscopy it is found that the nano-leaves and nano-rods grow along the (001) direction. Anisotropic, i.e., hkl-dependent line-shape broadening is observed in ZnO powder diffraction patterns. Rietveld analysis using Fullprof with model for handling the anisotropic size-like broadening is performed on these diffraction patterns. The refinement showed that ZnO powders belong to the hexagonal ZnS structure type with space group P63mc, and confirmed that the nano-leaves and nano-rods are oriented along the (001) direction. Results of visualization in 3D of the average crystallite shape obtained from refinement of spherical harmonics coefficients showed elongated shapes in the both samples, exhibiting a slight twisting for nano-leaves. Diffuse reflectance measurements reveal that the optical band-gap energies found for the ZnO nano-leaves and nano-rods is somewhat smaller than a wide-direct band gap of 3.37 eV. We argued that well defined and strong photoluminescence (PL) bands in the visible part that belong to the defects may influence the observed displacement of a ultraviolet (UV) near-band-edge emission, and which is related with obtained slightly lower band-gap energies than the established band gap of bulk ZnO. We discuss processes behind the multicolor UV/violet/blue/green/yellow emission band in PL spectra. (C) The Minerals, Metals and Materials Society and ASM International 2015",
journal = "Metallurgical and Materials Transactions. A: Physical Metallurgy and Materials Science",
title = "Microstructural Analysis and the Multicolor UV/Violet/Blue/Green/Yellow PL Observed from the Synthesized ZnO Nano-leaves and Nano-rods",
volume = "46A",
number = "8",
pages = "3679-3686",
doi = "10.1007/s11661-015-2961-x"
}
Validžić, I. Lj., Mitrić, M., Ahrenkiel, S. P.,& Čomor, M.. (2015). Microstructural Analysis and the Multicolor UV/Violet/Blue/Green/Yellow PL Observed from the Synthesized ZnO Nano-leaves and Nano-rods. in Metallurgical and Materials Transactions. A: Physical Metallurgy and Materials Science, 46A(8), 3679-3686.
https://doi.org/10.1007/s11661-015-2961-x
Validžić IL, Mitrić M, Ahrenkiel SP, Čomor M. Microstructural Analysis and the Multicolor UV/Violet/Blue/Green/Yellow PL Observed from the Synthesized ZnO Nano-leaves and Nano-rods. in Metallurgical and Materials Transactions. A: Physical Metallurgy and Materials Science. 2015;46A(8):3679-3686.
doi:10.1007/s11661-015-2961-x .
Validžić, Ivana Lj., Mitrić, Miodrag, Ahrenkiel, Scott Phillip, Čomor, Mirjana, "Microstructural Analysis and the Multicolor UV/Violet/Blue/Green/Yellow PL Observed from the Synthesized ZnO Nano-leaves and Nano-rods" in Metallurgical and Materials Transactions. A: Physical Metallurgy and Materials Science, 46A, no. 8 (2015):3679-3686,
https://doi.org/10.1007/s11661-015-2961-x . .
6
8
7

Interfacial synthesis and characterization of gold/polyaniline nanocomposites

Bogdanović, Una; Vodnik, Vesna; Ahrenkiel, Scott Phillip; Stoiljković, Milovan; Ćirić-Marjanović, Gordana N.; Nedeljković, Jovan

(2014)

TY  - JOUR
AU  - Bogdanović, Una
AU  - Vodnik, Vesna
AU  - Ahrenkiel, Scott Phillip
AU  - Stoiljković, Milovan
AU  - Ćirić-Marjanović, Gordana N.
AU  - Nedeljković, Jovan
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/105
AB  - Composites consisting of polyaniline (PANI) and gold nanoparticles (AuNPs) with an average size of 17 and 30 nm were synthesized by an interfacial method performed in an immiscible water/toluene biphasic system. The effect of embedded AuNPs on the morphology, structure and physicochemical properties of Au/PANI nanocomposites was investigated using scanning and transmission electron microscopies, UV-vis, FTIR, Raman and ICP-AES spectroscopies, X-ray diffraction, elemental analysis and conductivity measurements. Microscopy studies indicated nanofibrous morphology for pure PAN! and Au/PANI nanocomposites, while FTIR and Raman spectroscopies were confirmed emeraldine salt form of PANI chains and the presence of phenazine units. Also, Raman spectroscopy measurements revealed an inherent structural inhomogeneity at the macromolecular level that exist in PANI chains in its pure form as well as in Au/PANI nanocomposites. In addition, the increase of the electrical conductivity observed in the nanocomposites was discussed. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Synthetic Metals
T1  - Interfacial synthesis and characterization of gold/polyaniline nanocomposites
VL  - 195
SP  - 122
EP  - 131
DO  - 10.1016/j.synthmet.2014.05.018
ER  - 
@article{
author = "Bogdanović, Una and Vodnik, Vesna and Ahrenkiel, Scott Phillip and Stoiljković, Milovan and Ćirić-Marjanović, Gordana N. and Nedeljković, Jovan",
year = "2014",
abstract = "Composites consisting of polyaniline (PANI) and gold nanoparticles (AuNPs) with an average size of 17 and 30 nm were synthesized by an interfacial method performed in an immiscible water/toluene biphasic system. The effect of embedded AuNPs on the morphology, structure and physicochemical properties of Au/PANI nanocomposites was investigated using scanning and transmission electron microscopies, UV-vis, FTIR, Raman and ICP-AES spectroscopies, X-ray diffraction, elemental analysis and conductivity measurements. Microscopy studies indicated nanofibrous morphology for pure PAN! and Au/PANI nanocomposites, while FTIR and Raman spectroscopies were confirmed emeraldine salt form of PANI chains and the presence of phenazine units. Also, Raman spectroscopy measurements revealed an inherent structural inhomogeneity at the macromolecular level that exist in PANI chains in its pure form as well as in Au/PANI nanocomposites. In addition, the increase of the electrical conductivity observed in the nanocomposites was discussed. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Synthetic Metals",
title = "Interfacial synthesis and characterization of gold/polyaniline nanocomposites",
volume = "195",
pages = "122-131",
doi = "10.1016/j.synthmet.2014.05.018"
}
Bogdanović, U., Vodnik, V., Ahrenkiel, S. P., Stoiljković, M., Ćirić-Marjanović, G. N.,& Nedeljković, J.. (2014). Interfacial synthesis and characterization of gold/polyaniline nanocomposites. in Synthetic Metals, 195, 122-131.
https://doi.org/10.1016/j.synthmet.2014.05.018
Bogdanović U, Vodnik V, Ahrenkiel SP, Stoiljković M, Ćirić-Marjanović GN, Nedeljković J. Interfacial synthesis and characterization of gold/polyaniline nanocomposites. in Synthetic Metals. 2014;195:122-131.
doi:10.1016/j.synthmet.2014.05.018 .
Bogdanović, Una, Vodnik, Vesna, Ahrenkiel, Scott Phillip, Stoiljković, Milovan, Ćirić-Marjanović, Gordana N., Nedeljković, Jovan, "Interfacial synthesis and characterization of gold/polyaniline nanocomposites" in Synthetic Metals, 195 (2014):122-131,
https://doi.org/10.1016/j.synthmet.2014.05.018 . .
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36

Self-referenced luminescence thermometry with Sm3+ doped TiO2 nanoparticles

Dramićanin, Miroslav; Antic, Z.; Ćulubrk, Sanja; Ahrenkiel, Scott Phillip; Nedeljković, Jovan

(2014)

TY  - JOUR
AU  - Dramićanin, Miroslav
AU  - Antic, Z.
AU  - Ćulubrk, Sanja
AU  - Ahrenkiel, Scott Phillip
AU  - Nedeljković, Jovan
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/224
AB  - The performance of Sm3+ doped TiO2 nanoparticles for luminescence temperature sensing was tested over a temperature range from room to 110 degrees C. The Sm3+ ions were incorporated into TiO2 nanocrystals using hydrolytic sol-gel route. Microstructural characterization of the obtained material was performed using transmission electron microscopy and x-ray diffraction measurements. Luminescence emission spectra of Sm3+ doped TiO2 nanoparticles consists of two distinct spectral regions: the high energy region associated with the trap emission of the TiO2 host, and the low energy region with well-resolved emission peaks of the Sm3+ ions. The ratio between Sm3+ emission and TiO2 trap emission shows strong temperature dependence, and is tested for temperature sensing. The relative sensor sensitivity was found to be higher than 1% degrees C-1 over given temperature range with the maximum value of 10.54% degrees C-1 at 57.5 degrees C. Lifetime data derived from the Sm3+ emission decay revealed that time-resolved measurements provide comparable quality of temperature sensing as corresponding ratiometric measurements, with a maximum relative sensitivity of 10.14% degrees C-1 at 66.5 degrees C.
T2  - Nanotechnology
T1  - Self-referenced luminescence thermometry with Sm3+ doped TiO2 nanoparticles
VL  - 25
IS  - 48
DO  - 10.1088/0957-4484/25/48/485501
ER  - 
@article{
author = "Dramićanin, Miroslav and Antic, Z. and Ćulubrk, Sanja and Ahrenkiel, Scott Phillip and Nedeljković, Jovan",
year = "2014",
abstract = "The performance of Sm3+ doped TiO2 nanoparticles for luminescence temperature sensing was tested over a temperature range from room to 110 degrees C. The Sm3+ ions were incorporated into TiO2 nanocrystals using hydrolytic sol-gel route. Microstructural characterization of the obtained material was performed using transmission electron microscopy and x-ray diffraction measurements. Luminescence emission spectra of Sm3+ doped TiO2 nanoparticles consists of two distinct spectral regions: the high energy region associated with the trap emission of the TiO2 host, and the low energy region with well-resolved emission peaks of the Sm3+ ions. The ratio between Sm3+ emission and TiO2 trap emission shows strong temperature dependence, and is tested for temperature sensing. The relative sensor sensitivity was found to be higher than 1% degrees C-1 over given temperature range with the maximum value of 10.54% degrees C-1 at 57.5 degrees C. Lifetime data derived from the Sm3+ emission decay revealed that time-resolved measurements provide comparable quality of temperature sensing as corresponding ratiometric measurements, with a maximum relative sensitivity of 10.14% degrees C-1 at 66.5 degrees C.",
journal = "Nanotechnology",
title = "Self-referenced luminescence thermometry with Sm3+ doped TiO2 nanoparticles",
volume = "25",
number = "48",
doi = "10.1088/0957-4484/25/48/485501"
}
Dramićanin, M., Antic, Z., Ćulubrk, S., Ahrenkiel, S. P.,& Nedeljković, J.. (2014). Self-referenced luminescence thermometry with Sm3+ doped TiO2 nanoparticles. in Nanotechnology, 25(48).
https://doi.org/10.1088/0957-4484/25/48/485501
Dramićanin M, Antic Z, Ćulubrk S, Ahrenkiel SP, Nedeljković J. Self-referenced luminescence thermometry with Sm3+ doped TiO2 nanoparticles. in Nanotechnology. 2014;25(48).
doi:10.1088/0957-4484/25/48/485501 .
Dramićanin, Miroslav, Antic, Z., Ćulubrk, Sanja, Ahrenkiel, Scott Phillip, Nedeljković, Jovan, "Self-referenced luminescence thermometry with Sm3+ doped TiO2 nanoparticles" in Nanotechnology, 25, no. 48 (2014),
https://doi.org/10.1088/0957-4484/25/48/485501 . .
53
49
50

Synthesis and luminescent properties of rare earth (Sm3+ and Eu3+) Doped Gd2Ti2O7 pyrochlore nanopowders

Ćulubrk, Sanja; Antić, Željka; Marinović-Cincović, Milena; Ahrenkiel, Scott Phillip; Dramićanin, Miroslav

(2014)

TY  - JOUR
AU  - Ćulubrk, Sanja
AU  - Antić, Željka
AU  - Marinović-Cincović, Milena
AU  - Ahrenkiel, Scott Phillip
AU  - Dramićanin, Miroslav
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/217
AB  - This work describes the synthesis and photoluminescent properties of rare earth (Sm3+ and Eu3+) doped Gd2Ti2O7 pyrochlore nanopowders. Pure-phase rare earth-doped Gd2Ti2O7 nanoparticles of approximately 20-50 nm in diameter, as evidenced from X-ray diffraction and electron microscopy analysis, are produced via the mixed metal-citric acid complex method. A temperature of 880 degrees C is identified for the formation of the crystalline pyrochlore phase, based on a differential thermal analysis of Gd2Ti2O7 precursor gels. From photoluminescence excitation and emission spectra, measured at 10 K and room temperature, the energy levels of Sm3+ and Eu3+ ions in Gd2Ti2O7 nanoparticles are obtained. The dependence of luminescence emission intensity and emission decays on rare earth concentration are measured and discussed. The strongest Sm3+ orange-reddish emission is observed for samples containing 2.5 at.% of Sm3+ ions, while in the case of Eu3+, the most intense emission is found for 15 at.% Eu3+ doping. The (4)G(5/2) level lifetime decreases with an increase in Sm3+ concentration, from about 5 ms (for 0.1-0.2 at.% of Sm3+) to 2.4 ms (for 2.5 at.% of Sm3+). With an increase in Eu3+ concentration in the Gd2Ti2O7 nanoparticles, the Eu3+ D-5(0) level lifetime decreases from similar to 5.9 ms (for 0.5 at.% of Sm3+) to 3.1 ms (for 15 at.% of Sm3+). (C) 2014 Elsevier B.V. All rights reserved.
T2  - Optical Materials
T1  - Synthesis and luminescent properties of rare earth (Sm3+ and Eu3+) Doped Gd2Ti2O7 pyrochlore nanopowders
VL  - 37
SP  - 598
EP  - 606
DO  - 10.1016/j.optmat.2014.08.001
ER  - 
@article{
author = "Ćulubrk, Sanja and Antić, Željka and Marinović-Cincović, Milena and Ahrenkiel, Scott Phillip and Dramićanin, Miroslav",
year = "2014",
abstract = "This work describes the synthesis and photoluminescent properties of rare earth (Sm3+ and Eu3+) doped Gd2Ti2O7 pyrochlore nanopowders. Pure-phase rare earth-doped Gd2Ti2O7 nanoparticles of approximately 20-50 nm in diameter, as evidenced from X-ray diffraction and electron microscopy analysis, are produced via the mixed metal-citric acid complex method. A temperature of 880 degrees C is identified for the formation of the crystalline pyrochlore phase, based on a differential thermal analysis of Gd2Ti2O7 precursor gels. From photoluminescence excitation and emission spectra, measured at 10 K and room temperature, the energy levels of Sm3+ and Eu3+ ions in Gd2Ti2O7 nanoparticles are obtained. The dependence of luminescence emission intensity and emission decays on rare earth concentration are measured and discussed. The strongest Sm3+ orange-reddish emission is observed for samples containing 2.5 at.% of Sm3+ ions, while in the case of Eu3+, the most intense emission is found for 15 at.% Eu3+ doping. The (4)G(5/2) level lifetime decreases with an increase in Sm3+ concentration, from about 5 ms (for 0.1-0.2 at.% of Sm3+) to 2.4 ms (for 2.5 at.% of Sm3+). With an increase in Eu3+ concentration in the Gd2Ti2O7 nanoparticles, the Eu3+ D-5(0) level lifetime decreases from similar to 5.9 ms (for 0.5 at.% of Sm3+) to 3.1 ms (for 15 at.% of Sm3+). (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Optical Materials",
title = "Synthesis and luminescent properties of rare earth (Sm3+ and Eu3+) Doped Gd2Ti2O7 pyrochlore nanopowders",
volume = "37",
pages = "598-606",
doi = "10.1016/j.optmat.2014.08.001"
}
Ćulubrk, S., Antić, Ž., Marinović-Cincović, M., Ahrenkiel, S. P.,& Dramićanin, M.. (2014). Synthesis and luminescent properties of rare earth (Sm3+ and Eu3+) Doped Gd2Ti2O7 pyrochlore nanopowders. in Optical Materials, 37, 598-606.
https://doi.org/10.1016/j.optmat.2014.08.001
Ćulubrk S, Antić Ž, Marinović-Cincović M, Ahrenkiel SP, Dramićanin M. Synthesis and luminescent properties of rare earth (Sm3+ and Eu3+) Doped Gd2Ti2O7 pyrochlore nanopowders. in Optical Materials. 2014;37:598-606.
doi:10.1016/j.optmat.2014.08.001 .
Ćulubrk, Sanja, Antić, Željka, Marinović-Cincović, Milena, Ahrenkiel, Scott Phillip, Dramićanin, Miroslav, "Synthesis and luminescent properties of rare earth (Sm3+ and Eu3+) Doped Gd2Ti2O7 pyrochlore nanopowders" in Optical Materials, 37 (2014):598-606,
https://doi.org/10.1016/j.optmat.2014.08.001 . .
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Yb3+, Er3+ doped Y2O3 nanoparticles of different shapes prepared by self-propagating room temperature reaction method

Lojpur, Vesna; Ahrenkiel, Scott Phillip; Dramićanin, Miroslav

(2014)

TY  - JOUR
AU  - Lojpur, Vesna
AU  - Ahrenkiel, Scott Phillip
AU  - Dramićanin, Miroslav
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/197
AB  - In this report, a cost- and time-effective method for synthesis of Y2O3:Yb3+, Er3+ nanoparticles that exhibit up-conversion emission under infrared excitation is presented. The synthesis method is based on the self-propagating, room-temperature reaction between metal nitrates and sodium hydroxide, and a subsequent calcination process. Series of samples were prepared with calcinations at various temperatures (600 degrees C, 800 degrees C and 1100 degrees C) for 1 h, and also with different Yb3+-Er3+ ratios (10:1, 5:1 and 2:1). All calcined samples crystallized in a cubic bixbyite crystal phase with crystallite size from 12 to 44 nm in diameter, for samples calcined at 600 degrees C and 1100 degrees C, respectively. Different nanoparticle morphologies were obtained after calcinations on different temperatures; at temperatures under 1100 degrees C rod-like particles were obtained, while at 1100 degrees C spherical particles were formed. In all samples up-conversion emissions and corresponding lifetimes were measured after excitation in room temperature at 978 nm. The most intense emission originates from the characteristic intra-shell f-f electronic transitions of Er3+ ions: [2H(9/2)- GT I-4(15/2)] in blue (407-420 nm); [(H-2(11/2), S-4(3/2))- GT I-4(15/2)] green: 510-590 nm; and [F-4(9/2)- GT I-4(15/2)] in red (640-720 nm) spectral regions. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
T2  - Ceramics International
T1  - Yb3+, Er3+ doped Y2O3 nanoparticles of different shapes prepared by self-propagating room temperature reaction method
VL  - 40
IS  - 10
SP  - 16033
EP  - 16039
DO  - 10.1016/j.ceramint.2014.07.139
ER  - 
@article{
author = "Lojpur, Vesna and Ahrenkiel, Scott Phillip and Dramićanin, Miroslav",
year = "2014",
abstract = "In this report, a cost- and time-effective method for synthesis of Y2O3:Yb3+, Er3+ nanoparticles that exhibit up-conversion emission under infrared excitation is presented. The synthesis method is based on the self-propagating, room-temperature reaction between metal nitrates and sodium hydroxide, and a subsequent calcination process. Series of samples were prepared with calcinations at various temperatures (600 degrees C, 800 degrees C and 1100 degrees C) for 1 h, and also with different Yb3+-Er3+ ratios (10:1, 5:1 and 2:1). All calcined samples crystallized in a cubic bixbyite crystal phase with crystallite size from 12 to 44 nm in diameter, for samples calcined at 600 degrees C and 1100 degrees C, respectively. Different nanoparticle morphologies were obtained after calcinations on different temperatures; at temperatures under 1100 degrees C rod-like particles were obtained, while at 1100 degrees C spherical particles were formed. In all samples up-conversion emissions and corresponding lifetimes were measured after excitation in room temperature at 978 nm. The most intense emission originates from the characteristic intra-shell f-f electronic transitions of Er3+ ions: [2H(9/2)- GT I-4(15/2)] in blue (407-420 nm); [(H-2(11/2), S-4(3/2))- GT I-4(15/2)] green: 510-590 nm; and [F-4(9/2)- GT I-4(15/2)] in red (640-720 nm) spectral regions. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
journal = "Ceramics International",
title = "Yb3+, Er3+ doped Y2O3 nanoparticles of different shapes prepared by self-propagating room temperature reaction method",
volume = "40",
number = "10",
pages = "16033-16039",
doi = "10.1016/j.ceramint.2014.07.139"
}
Lojpur, V., Ahrenkiel, S. P.,& Dramićanin, M.. (2014). Yb3+, Er3+ doped Y2O3 nanoparticles of different shapes prepared by self-propagating room temperature reaction method. in Ceramics International, 40(10), 16033-16039.
https://doi.org/10.1016/j.ceramint.2014.07.139
Lojpur V, Ahrenkiel SP, Dramićanin M. Yb3+, Er3+ doped Y2O3 nanoparticles of different shapes prepared by self-propagating room temperature reaction method. in Ceramics International. 2014;40(10):16033-16039.
doi:10.1016/j.ceramint.2014.07.139 .
Lojpur, Vesna, Ahrenkiel, Scott Phillip, Dramićanin, Miroslav, "Yb3+, Er3+ doped Y2O3 nanoparticles of different shapes prepared by self-propagating room temperature reaction method" in Ceramics International, 40, no. 10 (2014):16033-16039,
https://doi.org/10.1016/j.ceramint.2014.07.139 . .
11
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11