TY  - JOUR
AU  - Šiljegović, Milorad
AU  - Kačarević-Popović, Zorica M.
AU  - Stchakovsky, M.
AU  - Radosavljević, Aleksandra
AU  - Korica, Sanja
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5943
AB  - The optical properties of 150 keV N+ implanted ethylene-norbornene (TOPAS 6017S-04) copolymer were investigated using phase modulated spectroscopic ellipsometry (PMSE) and ultraviolet-visible (UV-Vis) spectroscopy in the ranges of 0.6-6.5 eV and of 1.5-6.2 eV, respectively. The single-effectiveoscillator model was used to fit the calculated data to the experimental ellipsometric spectra. The results show that the oscillator and dispersion energies decrease with increasing ion fluence up to 10(15) cm(-2), and then these parameters increase with further fluence increasing. Analysis of the UV-Vis absorption spectra revealed the presence of indirect electronic transitions with the band gap energy in the range of 1.3 to 2.8 eV. It was found that both the band gap energy and the energy width of the distribution of localized band tail states decrease, while the values of Tauc coefficient increase with increasing the ion fluence. From the ellipsometric data we found that the real part of the dielectric function increased about 7% after irradiation with 10(15) cm(-2), and decreased about 10% in samples modified with 10(16) cm(-2).
T2  - Radiation Physics and Chemistry
T1  - Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films
VL  - 98
SP  - 7
EP  - 13
DO  - 10.1016/j.radphyschem.2013.12.023
ER  - 

@article{
author = "Šiljegović, Milorad and Kačarević-Popović, Zorica M. and Stchakovsky, M. and Radosavljević, Aleksandra and Korica, Sanja and Novaković, Mirjana M. and Popović, Maja",
year = "2014",
abstract = "The optical properties of 150 keV N+ implanted ethylene-norbornene (TOPAS 6017S-04) copolymer were investigated using phase modulated spectroscopic ellipsometry (PMSE) and ultraviolet-visible (UV-Vis) spectroscopy in the ranges of 0.6-6.5 eV and of 1.5-6.2 eV, respectively. The single-effectiveoscillator model was used to fit the calculated data to the experimental ellipsometric spectra. The results show that the oscillator and dispersion energies decrease with increasing ion fluence up to 10(15) cm(-2), and then these parameters increase with further fluence increasing. Analysis of the UV-Vis absorption spectra revealed the presence of indirect electronic transitions with the band gap energy in the range of 1.3 to 2.8 eV. It was found that both the band gap energy and the energy width of the distribution of localized band tail states decrease, while the values of Tauc coefficient increase with increasing the ion fluence. From the ellipsometric data we found that the real part of the dielectric function increased about 7% after irradiation with 10(15) cm(-2), and decreased about 10% in samples modified with 10(16) cm(-2).",
journal = "Radiation Physics and Chemistry",
title = "Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films",
volume = "98",
pages = "7-13",
doi = "10.1016/j.radphyschem.2013.12.023"
}

Šiljegović, M., Kačarević-Popović, Z. M., Stchakovsky, M., Radosavljević, A., Korica, S., Novaković, M. M.,& Popović, M.. (2014). Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films. in Radiation Physics and Chemistry, 98, 7-13.
https://doi.org/10.1016/j.radphyschem.2013.12.023

Šiljegović M, Kačarević-Popović ZM, Stchakovsky M, Radosavljević A, Korica S, Novaković MM, Popović M. Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films. in Radiation Physics and Chemistry. 2014;98:7-13.
doi:10.1016/j.radphyschem.2013.12.023 .

Šiljegović, Milorad, Kačarević-Popović, Zorica M., Stchakovsky, M., Radosavljević, Aleksandra, Korica, Sanja, Novaković, Mirjana M., Popović, Maja, "Spectroscopic ellipsometry study of N+ ion-implanted ethylene-norbornene films" in Radiation Physics and Chemistry, 98 (2014):7-13,
https://doi.org/10.1016/j.radphyschem.2013.12.023 . .

TY  - JOUR
AU  - Šiljegović, Milorad
AU  - Kačarević-Popović, Zorica M.
AU  - Bibić, Nataša M.
AU  - Jovanović, Zoran M.
AU  - Maletić, Slobodan
AU  - Stchakovsky, M.
AU  - Krklješ, Aleksandra N.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4516
AB  - Fluorinated ethylene propylene (FEP) and tetrafluoroethylene-perfluoro(alkoxy vinyl ether) (PFA) copolymer films were irradiated in vacuum with 60 key C4+ and N4+ ions to fluences ranging from 1.0 x 10(12) to 5.0 x 10(15) cm(-2). Changes in optical and dielectric properties were analyzed by spectroscopic ellipsometry and ultraviolet-visible (UV-vis), Raman and dielectric relaxation spectroscopies. Direct and indirect energy band gap values were determined from the absorption edge in the 200-800 nm region using Taucs relation. The values of the direct energy gap have been found to be greater than the corresponding values of the indirect energy gap. Significant changes in the index of refraction, and 13 and gamma dielectric relaxations were observed in the case of N4+ irradiated FEP and PFA samples. (C) 2011 Elsevier Ltd. All rights reserved.
T2  - Radiation Physics and Chemistry
T1  - Optical and dielectric properties of fluorinated ethylene propylene and tetrafluoroethylene-perfluoro(alkoxy vinyl ether) copolymer films modified by low energy N4+ and C4+ ion beams
VL  - 80
IS  - 12
SP  - 1378
EP  - 1385
DO  - 10.1016/j.radphyschem.2011.08.012
ER  - 

@article{
author = "Šiljegović, Milorad and Kačarević-Popović, Zorica M. and Bibić, Nataša M. and Jovanović, Zoran M. and Maletić, Slobodan and Stchakovsky, M. and Krklješ, Aleksandra N.",
year = "2011",
abstract = "Fluorinated ethylene propylene (FEP) and tetrafluoroethylene-perfluoro(alkoxy vinyl ether) (PFA) copolymer films were irradiated in vacuum with 60 key C4+ and N4+ ions to fluences ranging from 1.0 x 10(12) to 5.0 x 10(15) cm(-2). Changes in optical and dielectric properties were analyzed by spectroscopic ellipsometry and ultraviolet-visible (UV-vis), Raman and dielectric relaxation spectroscopies. Direct and indirect energy band gap values were determined from the absorption edge in the 200-800 nm region using Taucs relation. The values of the direct energy gap have been found to be greater than the corresponding values of the indirect energy gap. Significant changes in the index of refraction, and 13 and gamma dielectric relaxations were observed in the case of N4+ irradiated FEP and PFA samples. (C) 2011 Elsevier Ltd. All rights reserved.",
journal = "Radiation Physics and Chemistry",
title = "Optical and dielectric properties of fluorinated ethylene propylene and tetrafluoroethylene-perfluoro(alkoxy vinyl ether) copolymer films modified by low energy N4+ and C4+ ion beams",
volume = "80",
number = "12",
pages = "1378-1385",
doi = "10.1016/j.radphyschem.2011.08.012"
}

Šiljegović, M., Kačarević-Popović, Z. M., Bibić, N. M., Jovanović, Z. M., Maletić, S., Stchakovsky, M.,& Krklješ, A. N.. (2011). Optical and dielectric properties of fluorinated ethylene propylene and tetrafluoroethylene-perfluoro(alkoxy vinyl ether) copolymer films modified by low energy N4+ and C4+ ion beams. in Radiation Physics and Chemistry, 80(12), 1378-1385.
https://doi.org/10.1016/j.radphyschem.2011.08.012

Šiljegović M, Kačarević-Popović ZM, Bibić NM, Jovanović ZM, Maletić S, Stchakovsky M, Krklješ AN. Optical and dielectric properties of fluorinated ethylene propylene and tetrafluoroethylene-perfluoro(alkoxy vinyl ether) copolymer films modified by low energy N4+ and C4+ ion beams. in Radiation Physics and Chemistry. 2011;80(12):1378-1385.
doi:10.1016/j.radphyschem.2011.08.012 .

Šiljegović, Milorad, Kačarević-Popović, Zorica M., Bibić, Nataša M., Jovanović, Zoran M., Maletić, Slobodan, Stchakovsky, M., Krklješ, Aleksandra N., "Optical and dielectric properties of fluorinated ethylene propylene and tetrafluoroethylene-perfluoro(alkoxy vinyl ether) copolymer films modified by low energy N4+ and C4+ ion beams" in Radiation Physics and Chemistry, 80, no. 12 (2011):1378-1385,
https://doi.org/10.1016/j.radphyschem.2011.08.012 . .