TY  - JOUR
AU  - Vranješ, Mila
AU  - Kuljanin-Jakovljević, Jadranka Ž.
AU  - Konstantinović, Z.
AU  - Pomar, A.
AU  - Stoiljković, Milovan
AU  - Mitrić, Miodrag
AU  - Radetić, Tamara
AU  - Šaponjić, Zoran
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3595
AB  - Co2+ doped TiO2 nanocrystals were synthetized by a hydrothermal treatment procedure applied to precursor dispersion of titania nanotubes and Co2+ ions. Mixture of polygonal and prolate spheroid-like nanocrystals was obtained. The results of X-ray diffraction (XRD) analysis showed that resulted nanocrystals retain anatase crystal phase for both dopant concentrations (1.69 and 2.5 at%), but the crystal lattice parameters were affected. Reflection spectra revealed altered optical properties compared to bare TiO2. Room temperature ferromagnetic ordering with saturation magnetic moment in the range of 0.001-0.002 mu (B)/Co was observed for both measured films made of Co2+ doped TiO2 nanocrystals.
PB  - Springeropen, London
T2  - Journal of Advanced Ceramics
T1  - Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior
EP  - 229
IS  - 3
SP  - 220
VL  - 6
DO  - 10.1007/s40145-017-0233-5
ER  - 

@article{
author = "Vranješ, Mila and Kuljanin-Jakovljević, Jadranka Ž. and Konstantinović, Z. and Pomar, A. and Stoiljković, Milovan and Mitrić, Miodrag and Radetić, Tamara and Šaponjić, Zoran",
year = "2017",
abstract = "Co2+ doped TiO2 nanocrystals were synthetized by a hydrothermal treatment procedure applied to precursor dispersion of titania nanotubes and Co2+ ions. Mixture of polygonal and prolate spheroid-like nanocrystals was obtained. The results of X-ray diffraction (XRD) analysis showed that resulted nanocrystals retain anatase crystal phase for both dopant concentrations (1.69 and 2.5 at%), but the crystal lattice parameters were affected. Reflection spectra revealed altered optical properties compared to bare TiO2. Room temperature ferromagnetic ordering with saturation magnetic moment in the range of 0.001-0.002 mu (B)/Co was observed for both measured films made of Co2+ doped TiO2 nanocrystals.",
publisher = "Springeropen, London",
journal = "Journal of Advanced Ceramics",
title = "Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior",
pages = "229-220",
number = "3",
volume = "6",
doi = "10.1007/s40145-017-0233-5"
}

Vranješ, M., Kuljanin-Jakovljević, J. Ž., Konstantinović, Z., Pomar, A., Stoiljković, M., Mitrić, M., Radetić, T.,& Šaponjić, Z.. (2017). Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior. in Journal of Advanced Ceramics
Springeropen, London., 6(3), 220-229.
https://doi.org/10.1007/s40145-017-0233-5

Vranješ M, Kuljanin-Jakovljević JŽ, Konstantinović Z, Pomar A, Stoiljković M, Mitrić M, Radetić T, Šaponjić Z. Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior. in Journal of Advanced Ceramics. 2017;6(3):220-229.
doi:10.1007/s40145-017-0233-5 .

Vranješ, Mila, Kuljanin-Jakovljević, Jadranka Ž., Konstantinović, Z., Pomar, A., Stoiljković, Milovan, Mitrić, Miodrag, Radetić, Tamara, Šaponjić, Zoran, "Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior" in Journal of Advanced Ceramics, 6, no. 3 (2017):220-229,
https://doi.org/10.1007/s40145-017-0233-5 . .

TY  - JOUR
AU  - Vranješ, Mila
AU  - Kuljanin-Jakovljević, Jadranka Ž.
AU  - Konstantinović, Z.
AU  - Pomar, A.
AU  - Ahrenkiel, Scott Phillip
AU  - Radetić, Tamara
AU  - Stoiljković, Milovan
AU  - Mitrić, Miodrag
AU  - Šaponjić, Zoran
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3443
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.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Materials Research Bulletin
T1  - Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration
EP  - 106
SP  - 100
VL  - 76
DO  - 10.1016/j.materresbull.2015.11.051
ER  - 

@article{
author = "Vranješ, Mila and Kuljanin-Jakovljević, Jadranka Ž. and Konstantinović, Z. and Pomar, A. and Ahrenkiel, Scott Phillip and Radetić, 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.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Materials Research Bulletin",
title = "Room temperature ferromagnetism in Cu2+ doped TiO2 nanocrystals: The impact of their size, shape and dopant concentration",
pages = "106-100",
volume = "76",
doi = "10.1016/j.materresbull.2015.11.051"
}

Vranješ, M., Kuljanin-Jakovljević, J. Ž., Konstantinović, Z., Pomar, A., Ahrenkiel, S. P., Radetić, 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
Pergamon-Elsevier Science Ltd, Oxford., 76, 100-106.
https://doi.org/10.1016/j.materresbull.2015.11.051

Vranješ M, Kuljanin-Jakovljević JŽ, Konstantinović Z, Pomar A, Ahrenkiel SP, Radetić 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, Z., Pomar, A., Ahrenkiel, Scott Phillip, Radetić, 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 . .

TY  - JOUR
AU  - Vranješ, Mila
AU  - Kuljanin-Jakovljević, Jadranka Ž.
AU  - Radetić, Tamara
AU  - Stoiljković, Milovan
AU  - Mitrić, Miodrag
AU  - Šaponjić, Zoran
AU  - Nedeljković, Jovan
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2108
AB  - We report on a new approach to the synthesis of Eu3+ doped TiO2 nanocrystals and prolate nanospheroids. They were synthesized by shape transformation of hydrothermally treated titania nanotubes at different pH and in the presence of Eu3+ ions. The use of nanotubes as a precursor to the synthesis of Eu3+ doped TiO2 nanocrystals and prolate nanospheroids opens the possibility of overcoming the problems related to molecular precursors. The shapes and sizes of the nanotubes, Eu3+ doped TiO2 nanocrystals and prolate nanospheroids were characterized by transmission electron microscopy (TEM) technique. Crystal structures of the resultant powders were investigated by X-ray diffraction (XRD) analysis. The percentage ratio of Eu3+ to Ti4+ ions in doped nanocrystals was determined using inductively coupled plasma atomic emission spectroscopy. The optical characterization was done by using fluorescence and ultraviolet-visible reflection spectroscopies. An average size of faceted Eu3+ doped TiO2 nanocrystals was 13 nm. The lateral dimensions of Eu3+ doped TiO2 prolate nanospheroids varied from 14 to 20 nm, while the length varied from 40 to 80 nm, depending on precursor concentrations. The XRD patterns revealed the homogeneous anatase crystal phase of Eu3+ doped TiO2 nanocrystals and prolate nanospheroids independently of the amount of dopant. A postsynthetic treatment (filtration or dialysis) was applied on the dispersions of the doped nanoparticles in order to study the influence of the dopant position on photoluminescence (PL) spectra. In the red spectral region, room temperature PL signals associated with D-5(0) - gt  F-7(J) (J = 1-4) transitions of Eu3+ were observed in all samples. The increased contribution of dopants from the interior region of dialyzed nanocrystals to photoluminescence was confirmed by the increase of R value.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Structure and luminescence properties of Eu3+ doped TiO2 nanocrystals and prolate nanospheroids synthesized by the hydrothermal processing
EP  - 5636
IS  - 7
SP  - 5629
VL  - 38
DO  - 10.1016/j.ceramint.2012.04.004
ER  - 

@article{
author = "Vranješ, Mila and Kuljanin-Jakovljević, Jadranka Ž. and Radetić, Tamara and Stoiljković, Milovan and Mitrić, Miodrag and Šaponjić, Zoran and Nedeljković, Jovan",
year = "2012",
abstract = "We report on a new approach to the synthesis of Eu3+ doped TiO2 nanocrystals and prolate nanospheroids. They were synthesized by shape transformation of hydrothermally treated titania nanotubes at different pH and in the presence of Eu3+ ions. The use of nanotubes as a precursor to the synthesis of Eu3+ doped TiO2 nanocrystals and prolate nanospheroids opens the possibility of overcoming the problems related to molecular precursors. The shapes and sizes of the nanotubes, Eu3+ doped TiO2 nanocrystals and prolate nanospheroids were characterized by transmission electron microscopy (TEM) technique. Crystal structures of the resultant powders were investigated by X-ray diffraction (XRD) analysis. The percentage ratio of Eu3+ to Ti4+ ions in doped nanocrystals was determined using inductively coupled plasma atomic emission spectroscopy. The optical characterization was done by using fluorescence and ultraviolet-visible reflection spectroscopies. An average size of faceted Eu3+ doped TiO2 nanocrystals was 13 nm. The lateral dimensions of Eu3+ doped TiO2 prolate nanospheroids varied from 14 to 20 nm, while the length varied from 40 to 80 nm, depending on precursor concentrations. The XRD patterns revealed the homogeneous anatase crystal phase of Eu3+ doped TiO2 nanocrystals and prolate nanospheroids independently of the amount of dopant. A postsynthetic treatment (filtration or dialysis) was applied on the dispersions of the doped nanoparticles in order to study the influence of the dopant position on photoluminescence (PL) spectra. In the red spectral region, room temperature PL signals associated with D-5(0) - gt  F-7(J) (J = 1-4) transitions of Eu3+ were observed in all samples. The increased contribution of dopants from the interior region of dialyzed nanocrystals to photoluminescence was confirmed by the increase of R value.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Structure and luminescence properties of Eu3+ doped TiO2 nanocrystals and prolate nanospheroids synthesized by the hydrothermal processing",
pages = "5636-5629",
number = "7",
volume = "38",
doi = "10.1016/j.ceramint.2012.04.004"
}

Vranješ, M., Kuljanin-Jakovljević, J. Ž., Radetić, T., Stoiljković, M., Mitrić, M., Šaponjić, Z.,& Nedeljković, J.. (2012). Structure and luminescence properties of Eu3+ doped TiO2 nanocrystals and prolate nanospheroids synthesized by the hydrothermal processing. in Ceramics International
Elsevier Sci Ltd, Oxford., 38(7), 5629-5636.
https://doi.org/10.1016/j.ceramint.2012.04.004

Vranješ M, Kuljanin-Jakovljević JŽ, Radetić T, Stoiljković M, Mitrić M, Šaponjić Z, Nedeljković J. Structure and luminescence properties of Eu3+ doped TiO2 nanocrystals and prolate nanospheroids synthesized by the hydrothermal processing. in Ceramics International. 2012;38(7):5629-5636.
doi:10.1016/j.ceramint.2012.04.004 .

Vranješ, Mila, Kuljanin-Jakovljević, Jadranka Ž., Radetić, Tamara, Stoiljković, Milovan, Mitrić, Miodrag, Šaponjić, Zoran, Nedeljković, Jovan, "Structure and luminescence properties of Eu3+ doped TiO2 nanocrystals and prolate nanospheroids synthesized by the hydrothermal processing" in Ceramics International, 38, no. 7 (2012):5629-5636,
https://doi.org/10.1016/j.ceramint.2012.04.004 . .