TY  - CONF
AU  - Ahmetović, Sanita
AU  - Vasiljević, Zorka Ž.
AU  - Rajić, Vladimir
AU  - Bartolić, Dragana
AU  - Novaković, Mirjana
AU  - Tadić, Nenad
AU  - Cvjetićanin, Nikola
AU  - Nikolić, Maria Vesna
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11747
AB  - In this work, titanium dioxide (TiO2) nanofibers doped with 0.5–5 mol% zirconium ions (Zr4+) were synthesized by combining the sol-gel process and electrospinning method, and calcined at 500 °C. The morphological, structural and optical properties of pure and Zr-doped TiO2 nanofibers were investigated. According to the XRD and FTIR analyses, the addition of Zr as a dopant suppressed the transformation of anatase to rutile phase. Scanning electron microscopy showed that all fibers were smooth, fragile and randomly oriented after the calcination process. HRTEM analysis revealed that Zr4+ ions were incorporated at the substitutional sites in the anatase TiO2 crystalline lattice. The photocatalytic efficiency for degradation of methylene blue (MB) was examined for both pure and Zr-doped TiO2 samples. Nanofibers doped with 1% of Zr4+ ions have shown the highest photocatalytic activity of 98%, wich can be explained by considering lower PL intensity in the PL spectrum of this sample, indicating suppressed electron-hole recombination.
PB  - Novi Sad : Faculty of Technology, University of Novi Sad
C3  - CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, programme and book of abstracts; Oct 11-14, Novi Sad
T1  - Investigating the effects of Zr doping on the titanium dioxide nanofibres
SP  - 134
EP  - 134
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11747
ER  - 

@conference{
author = "Ahmetović, Sanita and Vasiljević, Zorka Ž. and Rajić, Vladimir and Bartolić, Dragana and Novaković, Mirjana and Tadić, Nenad and Cvjetićanin, Nikola and Nikolić, Maria Vesna",
year = "2023",
abstract = "In this work, titanium dioxide (TiO2) nanofibers doped with 0.5–5 mol% zirconium ions (Zr4+) were synthesized by combining the sol-gel process and electrospinning method, and calcined at 500 °C. The morphological, structural and optical properties of pure and Zr-doped TiO2 nanofibers were investigated. According to the XRD and FTIR analyses, the addition of Zr as a dopant suppressed the transformation of anatase to rutile phase. Scanning electron microscopy showed that all fibers were smooth, fragile and randomly oriented after the calcination process. HRTEM analysis revealed that Zr4+ ions were incorporated at the substitutional sites in the anatase TiO2 crystalline lattice. The photocatalytic efficiency for degradation of methylene blue (MB) was examined for both pure and Zr-doped TiO2 samples. Nanofibers doped with 1% of Zr4+ ions have shown the highest photocatalytic activity of 98%, wich can be explained by considering lower PL intensity in the PL spectrum of this sample, indicating suppressed electron-hole recombination.",
publisher = "Novi Sad : Faculty of Technology, University of Novi Sad",
journal = "CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, programme and book of abstracts; Oct 11-14, Novi Sad",
title = "Investigating the effects of Zr doping on the titanium dioxide nanofibres",
pages = "134-134",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11747"
}

Ahmetović, S., Vasiljević, Z. Ž., Rajić, V., Bartolić, D., Novaković, M., Tadić, N., Cvjetićanin, N.,& Nikolić, M. V.. (2023). Investigating the effects of Zr doping on the titanium dioxide nanofibres. in CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, programme and book of abstracts; Oct 11-14, Novi Sad
Novi Sad : Faculty of Technology, University of Novi Sad., 134-134.
https://hdl.handle.net/21.15107/rcub_vinar_11747

Ahmetović S, Vasiljević ZŽ, Rajić V, Bartolić D, Novaković M, Tadić N, Cvjetićanin N, Nikolić MV. Investigating the effects of Zr doping on the titanium dioxide nanofibres. in CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, programme and book of abstracts; Oct 11-14, Novi Sad. 2023;:134-134.
https://hdl.handle.net/21.15107/rcub_vinar_11747 .

Ahmetović, Sanita, Vasiljević, Zorka Ž., Rajić, Vladimir, Bartolić, Dragana, Novaković, Mirjana, Tadić, Nenad, Cvjetićanin, Nikola, Nikolić, Maria Vesna, "Investigating the effects of Zr doping on the titanium dioxide nanofibres" in CYSC-2023 : 15th EcerS Conference for Young Scientists in Ceramics, programme and book of abstracts; Oct 11-14, Novi Sad (2023):134-134,
https://hdl.handle.net/21.15107/rcub_vinar_11747 .

TY  - JOUR
AU  - Latas, Nemanja
AU  - Cvjetićanin, Nikola
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12380
AB  - Anatase TiO2 was prepared in the form of nanotube arrays by anodic oxidation of Ti foil followed by annealing at 400 °C. Electrochemical experiments, which included cyclic voltammetry (CV), galvanostatic (GS) cycling and electrochemical impedance spectroscopy (EIS) were conducted in 1 M solution of LiClO4 in propylene carbonate (PC) at temperatures 25 °C–55 °C. CV experiments, at scan rates 5–50 mV·s−1 , demonstrated with increasing temperature a large increase in the intensity of the redox peaks along with a decrease in the peak-to-peak separation. GS cycling showed large increase of capacity of thin-wall TiO2 nanotubes with increasing temperature, which attains 357 mAh·g−1 at 55 °C during lithiation at current rate 5.3 C, with capacity retention of 98.5% and Coulombic efficiency of 97.5%. Surface storage and development of secondary voltage plateau strongly contribute to such a large capacity value. EIS showed a multiple decrease in solid electrolyte interphase (SEI) layer resistance and charge transfer resistance with temperature rising up to 55 °C.
T2  - Journal of The Electrochemical Society
T1  - Large Li-Ion Insertion Capacity of Thin-Wall Anatase TiO                    2                    Nanotubes at 25 °C–55 °C
VL  - 170
IS  - 9
SP  - 090504
DO  - 10.1149/1945-7111/acf245
ER  - 

@article{
author = "Latas, Nemanja and Cvjetićanin, Nikola",
year = "2023",
abstract = "Anatase TiO2 was prepared in the form of nanotube arrays by anodic oxidation of Ti foil followed by annealing at 400 °C. Electrochemical experiments, which included cyclic voltammetry (CV), galvanostatic (GS) cycling and electrochemical impedance spectroscopy (EIS) were conducted in 1 M solution of LiClO4 in propylene carbonate (PC) at temperatures 25 °C–55 °C. CV experiments, at scan rates 5–50 mV·s−1 , demonstrated with increasing temperature a large increase in the intensity of the redox peaks along with a decrease in the peak-to-peak separation. GS cycling showed large increase of capacity of thin-wall TiO2 nanotubes with increasing temperature, which attains 357 mAh·g−1 at 55 °C during lithiation at current rate 5.3 C, with capacity retention of 98.5% and Coulombic efficiency of 97.5%. Surface storage and development of secondary voltage plateau strongly contribute to such a large capacity value. EIS showed a multiple decrease in solid electrolyte interphase (SEI) layer resistance and charge transfer resistance with temperature rising up to 55 °C.",
journal = "Journal of The Electrochemical Society",
title = "Large Li-Ion Insertion Capacity of Thin-Wall Anatase TiO                    2                    Nanotubes at 25 °C–55 °C",
volume = "170",
number = "9",
pages = "090504",
doi = "10.1149/1945-7111/acf245"
}

Latas, N.,& Cvjetićanin, N.. (2023). Large Li-Ion Insertion Capacity of Thin-Wall Anatase TiO                    2                    Nanotubes at 25 °C–55 °C. in Journal of The Electrochemical Society, 170(9), 090504.
https://doi.org/10.1149/1945-7111/acf245

Latas N, Cvjetićanin N. Large Li-Ion Insertion Capacity of Thin-Wall Anatase TiO                    2                    Nanotubes at 25 °C–55 °C. in Journal of The Electrochemical Society. 2023;170(9):090504.
doi:10.1149/1945-7111/acf245 .

Latas, Nemanja, Cvjetićanin, Nikola, "Large Li-Ion Insertion Capacity of Thin-Wall Anatase TiO                    2                    Nanotubes at 25 °C–55 °C" in Journal of The Electrochemical Society, 170, no. 9 (2023):090504,
https://doi.org/10.1149/1945-7111/acf245 . .

TY  - JOUR
AU  - Veselinović, Ljiljana
AU  - Mitrić, Miodrag
AU  - Mančić, Lidija
AU  - Jardim, Paula M.
AU  - Škapin, Srečo Davor
AU  - Cvjetićanin, Nikola
AU  - Milović, Miloš D.
AU  - Marković, Smilja
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12382
AB  - This paper reports a detailed study of crystal structure and dielectric properties of ruthenium-substituted calcium-copper titanates (CaCu3Ti4−xRuxO12, CCTRO). A series of three samples with different stoichiometry was prepared: CaCu3Ti4−xRuxO12, x = 0, 1 and 4, abbreviated as CCTO, CCT3RO and CCRO, respectively. A detailed structural analysis of CCTRO samples was done by the Rietveld refinement of XRPD data. The results show that, regardless of whether Ti4+ or Ru4+ ions are placed in B crystallographic position in AA’3B4O12 (CaCu3Ti4−xRuxO12) unit cell, the crystal structure remains cubic with Im3¯ symmetry. Slight increases in the unit cell parameters, cell volume and interatomic distances indicate that Ru4+ ions with larger ionic radii (0.62 Å) than Ti4+ (0.605 Å) are incorporated in the CaCu3Ti4−xRuxO12 crystal lattice. The structural investigations were confirmed using TEM, HRTEM and ADF/STEM analyses, including EDXS elemental mapping. The effect of Ru atoms share in CaCu3Ti4−xRuxO12 samples on their electrical properties was determined by impedance and dielectric measurements. Results of dielectric measurements indicate that one atom of ruthenium per CaCu3Ti4−xRuxO12 unit cell transforms dielectric CCTO into conductive CCT3RO while preserving cubic crystal structure. Our findings about CCTO and CCT3RO ceramics promote them as ideal tandem to overcome the problem of stress on dielectric-electrode interfaces in capacitors.
T2  - Materials
T1  - Crystal Structure and Electrical Properties of Ruthenium-Substituted Calcium Copper Titanate
VL  - 15
IS  - 23
SP  - 8500
SP  - 8500
DO  - 10.3390/ma15238500
ER  - 

@article{
author = "Veselinović, Ljiljana and Mitrić, Miodrag and Mančić, Lidija and Jardim, Paula M. and Škapin, Srečo Davor and Cvjetićanin, Nikola and Milović, Miloš D. and Marković, Smilja",
year = "2022",
abstract = "This paper reports a detailed study of crystal structure and dielectric properties of ruthenium-substituted calcium-copper titanates (CaCu3Ti4−xRuxO12, CCTRO). A series of three samples with different stoichiometry was prepared: CaCu3Ti4−xRuxO12, x = 0, 1 and 4, abbreviated as CCTO, CCT3RO and CCRO, respectively. A detailed structural analysis of CCTRO samples was done by the Rietveld refinement of XRPD data. The results show that, regardless of whether Ti4+ or Ru4+ ions are placed in B crystallographic position in AA’3B4O12 (CaCu3Ti4−xRuxO12) unit cell, the crystal structure remains cubic with Im3¯ symmetry. Slight increases in the unit cell parameters, cell volume and interatomic distances indicate that Ru4+ ions with larger ionic radii (0.62 Å) than Ti4+ (0.605 Å) are incorporated in the CaCu3Ti4−xRuxO12 crystal lattice. The structural investigations were confirmed using TEM, HRTEM and ADF/STEM analyses, including EDXS elemental mapping. The effect of Ru atoms share in CaCu3Ti4−xRuxO12 samples on their electrical properties was determined by impedance and dielectric measurements. Results of dielectric measurements indicate that one atom of ruthenium per CaCu3Ti4−xRuxO12 unit cell transforms dielectric CCTO into conductive CCT3RO while preserving cubic crystal structure. Our findings about CCTO and CCT3RO ceramics promote them as ideal tandem to overcome the problem of stress on dielectric-electrode interfaces in capacitors.",
journal = "Materials",
title = "Crystal Structure and Electrical Properties of Ruthenium-Substituted Calcium Copper Titanate",
volume = "15",
number = "23",
pages = "8500-8500",
doi = "10.3390/ma15238500"
}

Veselinović, L., Mitrić, M., Mančić, L., Jardim, P. M., Škapin, S. D., Cvjetićanin, N., Milović, M. D.,& Marković, S.. (2022). Crystal Structure and Electrical Properties of Ruthenium-Substituted Calcium Copper Titanate. in Materials, 15(23), 8500.
https://doi.org/10.3390/ma15238500

Veselinović L, Mitrić M, Mančić L, Jardim PM, Škapin SD, Cvjetićanin N, Milović MD, Marković S. Crystal Structure and Electrical Properties of Ruthenium-Substituted Calcium Copper Titanate. in Materials. 2022;15(23):8500.
doi:10.3390/ma15238500 .

Veselinović, Ljiljana, Mitrić, Miodrag, Mančić, Lidija, Jardim, Paula M., Škapin, Srečo Davor, Cvjetićanin, Nikola, Milović, Miloš D., Marković, Smilja, "Crystal Structure and Electrical Properties of Ruthenium-Substituted Calcium Copper Titanate" in Materials, 15, no. 23 (2022):8500,
https://doi.org/10.3390/ma15238500 . .