TY  - JOUR
AU  - Jovanović, Željka
AU  - Radosavljević, Aleksandra
AU  - Šiljegović, Milorad
AU  - Bibić, Nataša M.
AU  - Mišković-Stanković, Vesna
AU  - Kačarević-Popović, Zorica M.
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2113
AB  - Silver nanoparticles (AgNPs) were synthesized in situ by gamma-irradiation using poly(N-vinyl-2-pyrrolidone) (PVP) as a capping agent. The concentration, molecular weight and the structure (crosslinked and interpenetrated network) of PVP were varied, in order to determine the influence of the capping agent in the radiolytic synthesis of the Ag/PVP nanosystems. Transmission electron microscopy (TEM) showed that AgNPs obtained from the solutions containing higher PVP concentration and higher molecular weight were spherical in shape, with narrow size distribution and a diameter of similar to 6 nm, while slightly larger rod-shaped silver agglomerates, with bimodal nanoparticle size distribution and diameters of similar to 10 nm and similar to 20 nm were obtained from the solutions containing lower PVP concentration and lower molecular weight. Strong plasmon coupling and extending of plasmon resonance was observed by UV-vis spectroscopy, as a result of formation of nanorod-like agglomerates. Crosslinked and interpenetrated network did not affect the structure of synthesized AgNPs. Ag/PVP nanocomposite, in the form of thin film, was obtained by solvent evaporation from Ag/PVP colloid solution with 10 wt% of PVP, and characterized by FTIR spectroscopy. The interactions in Ag/PVP nanocomposite are shown to be the result of the coordination bonding between AgNPs and nitrogen from pyrrolidone ring of PVP. The optical properties of investigated Ag/PVP nanosystems, as measured by the values of optical band gap, E-g, are mainly the consequence of the interparticle distance as a result of the concentration and the structure of surrounding PVP macromolecules.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Radiation Physics and Chemistry
T1  - Structural and optical characteristics of silver/poly(N-vinyl-2-pyrrolidone) nanosystems synthesized by gamma-irradiation
EP  - 1728
IS  - 11
SP  - 1720
VL  - 81
DO  - 10.1016/j.radphyschem.2012.05.019
ER  - 

@article{
author = "Jovanović, Željka and Radosavljević, Aleksandra and Šiljegović, Milorad and Bibić, Nataša M. and Mišković-Stanković, Vesna and Kačarević-Popović, Zorica M.",
year = "2012",
abstract = "Silver nanoparticles (AgNPs) were synthesized in situ by gamma-irradiation using poly(N-vinyl-2-pyrrolidone) (PVP) as a capping agent. The concentration, molecular weight and the structure (crosslinked and interpenetrated network) of PVP were varied, in order to determine the influence of the capping agent in the radiolytic synthesis of the Ag/PVP nanosystems. Transmission electron microscopy (TEM) showed that AgNPs obtained from the solutions containing higher PVP concentration and higher molecular weight were spherical in shape, with narrow size distribution and a diameter of similar to 6 nm, while slightly larger rod-shaped silver agglomerates, with bimodal nanoparticle size distribution and diameters of similar to 10 nm and similar to 20 nm were obtained from the solutions containing lower PVP concentration and lower molecular weight. Strong plasmon coupling and extending of plasmon resonance was observed by UV-vis spectroscopy, as a result of formation of nanorod-like agglomerates. Crosslinked and interpenetrated network did not affect the structure of synthesized AgNPs. Ag/PVP nanocomposite, in the form of thin film, was obtained by solvent evaporation from Ag/PVP colloid solution with 10 wt% of PVP, and characterized by FTIR spectroscopy. The interactions in Ag/PVP nanocomposite are shown to be the result of the coordination bonding between AgNPs and nitrogen from pyrrolidone ring of PVP. The optical properties of investigated Ag/PVP nanosystems, as measured by the values of optical band gap, E-g, are mainly the consequence of the interparticle distance as a result of the concentration and the structure of surrounding PVP macromolecules.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Radiation Physics and Chemistry",
title = "Structural and optical characteristics of silver/poly(N-vinyl-2-pyrrolidone) nanosystems synthesized by gamma-irradiation",
pages = "1728-1720",
number = "11",
volume = "81",
doi = "10.1016/j.radphyschem.2012.05.019"
}

Jovanović, Ž., Radosavljević, A., Šiljegović, M., Bibić, N. M., Mišković-Stanković, V.,& Kačarević-Popović, Z. M.. (2012). Structural and optical characteristics of silver/poly(N-vinyl-2-pyrrolidone) nanosystems synthesized by gamma-irradiation. in Radiation Physics and Chemistry
Pergamon-Elsevier Science Ltd, Oxford., 81(11), 1720-1728.
https://doi.org/10.1016/j.radphyschem.2012.05.019

Jovanović Ž, Radosavljević A, Šiljegović M, Bibić NM, Mišković-Stanković V, Kačarević-Popović ZM. Structural and optical characteristics of silver/poly(N-vinyl-2-pyrrolidone) nanosystems synthesized by gamma-irradiation. in Radiation Physics and Chemistry. 2012;81(11):1720-1728.
doi:10.1016/j.radphyschem.2012.05.019 .

Jovanović, Željka, Radosavljević, Aleksandra, Šiljegović, Milorad, Bibić, Nataša M., Mišković-Stanković, Vesna, Kačarević-Popović, Zorica M., "Structural and optical characteristics of silver/poly(N-vinyl-2-pyrrolidone) nanosystems synthesized by gamma-irradiation" in Radiation Physics and Chemistry, 81, no. 11 (2012):1720-1728,
https://doi.org/10.1016/j.radphyschem.2012.05.019 . .

TY  - JOUR
AU  - Đošić, Marija
AU  - Bibić, Nataša M.
AU  - Mitrić, Miodrag
AU  - Šiljegović, Milorad
AU  - Stojanović, Jovica
AU  - Jokić, Bojan
AU  - Janaćković, Đorđe
AU  - Mišković-Stanković, Vesna
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1531
AB  - Surface modification of hydroxyapatite (HA) thin films electrodeposited on titanium was conducted by ion implantation, using nitrogen and argon ions at different constant fluences of 1x10(15), 1x10(16) and 1x10(17) ions/cm(2). SEM and XRD analysis, as well as SRIM calculation, were used to monitor the changes induced by ion bombardment. In the case of HA film implanted with N4+ ions, the unit cell parameters and unit cell volume increase with increasing nitrogen ion fluences. Similarly, the unit cell parameters and unit cell volume increase after Ar6+ ions irradiation to a 1x10(15) ions/cm(2). At higher fluences, the unit cell parameters and unit cell volume decrease when argon ion fluences increase to 1x10(16) and 1x10(17) ions/cm(2). These structural changes are consequence of different mechanism of energy transfer of nitrogen and argon ions to HA film. For nitrogen ion irradiation electron energy loss is predominant, while for argon ion irradiation nuclear energy transfer to HA film prevails.
PB  - Natl Inst Optoelectronics, Bucharest-Magurele
T2  - Journal of Optoelectronics and Advanced Materials
T1  - Electrodeposited hydroxyapatite thin films modified by ion beam irradiation
EP  - 1854
IS  - 11
SP  - 1848
VL  - 11
UR  - https://hdl.handle.net/21.15107/rcub_vinar_3872
ER  - 

@article{
author = "Đošić, Marija and Bibić, Nataša M. and Mitrić, Miodrag and Šiljegović, Milorad and Stojanović, Jovica and Jokić, Bojan and Janaćković, Đorđe and Mišković-Stanković, Vesna",
year = "2009",
abstract = "Surface modification of hydroxyapatite (HA) thin films electrodeposited on titanium was conducted by ion implantation, using nitrogen and argon ions at different constant fluences of 1x10(15), 1x10(16) and 1x10(17) ions/cm(2). SEM and XRD analysis, as well as SRIM calculation, were used to monitor the changes induced by ion bombardment. In the case of HA film implanted with N4+ ions, the unit cell parameters and unit cell volume increase with increasing nitrogen ion fluences. Similarly, the unit cell parameters and unit cell volume increase after Ar6+ ions irradiation to a 1x10(15) ions/cm(2). At higher fluences, the unit cell parameters and unit cell volume decrease when argon ion fluences increase to 1x10(16) and 1x10(17) ions/cm(2). These structural changes are consequence of different mechanism of energy transfer of nitrogen and argon ions to HA film. For nitrogen ion irradiation electron energy loss is predominant, while for argon ion irradiation nuclear energy transfer to HA film prevails.",
publisher = "Natl Inst Optoelectronics, Bucharest-Magurele",
journal = "Journal of Optoelectronics and Advanced Materials",
title = "Electrodeposited hydroxyapatite thin films modified by ion beam irradiation",
pages = "1854-1848",
number = "11",
volume = "11",
url = "https://hdl.handle.net/21.15107/rcub_vinar_3872"
}

Đošić, M., Bibić, N. M., Mitrić, M., Šiljegović, M., Stojanović, J., Jokić, B., Janaćković, Đ.,& Mišković-Stanković, V.. (2009). Electrodeposited hydroxyapatite thin films modified by ion beam irradiation. in Journal of Optoelectronics and Advanced Materials
Natl Inst Optoelectronics, Bucharest-Magurele., 11(11), 1848-1854.
https://hdl.handle.net/21.15107/rcub_vinar_3872

Đošić M, Bibić NM, Mitrić M, Šiljegović M, Stojanović J, Jokić B, Janaćković Đ, Mišković-Stanković V. Electrodeposited hydroxyapatite thin films modified by ion beam irradiation. in Journal of Optoelectronics and Advanced Materials. 2009;11(11):1848-1854.
https://hdl.handle.net/21.15107/rcub_vinar_3872 .

Đošić, Marija, Bibić, Nataša M., Mitrić, Miodrag, Šiljegović, Milorad, Stojanović, Jovica, Jokić, Bojan, Janaćković, Đorđe, Mišković-Stanković, Vesna, "Electrodeposited hydroxyapatite thin films modified by ion beam irradiation" in Journal of Optoelectronics and Advanced Materials, 11, no. 11 (2009):1848-1854,
https://hdl.handle.net/21.15107/rcub_vinar_3872 .