Prolonged annealing of pentacene thin films in air leads to the formation of nano- and micro-scale rod-shaped structures at temperatures equal to or higher than 130 degrees C. Scanning electron microscopy measurements indicated their crystalline structure, while UV-vis absorption spectra revealed presence of different species of oxidized pentacene, including 6,13-pentacenequinone. The mechanism of growth of microcrystals from oxidized pentacene molecules is discussed. Raman and UV-vis absorption spectra dependences on film thickness (in 30-300 nm range) and on thermal annealing conditions (in air and nitrogen at ambient pressure at 100 and 150 degrees C) were also studied. These spectra are not largely affected by annealing if it is performed in nitrogen at any of studied temperatures and annealing times (few hours to few days). However, if annealing is performed in air, at temperatures 130 degrees C and higher, changes in spectral features are significant due to film oxidation.
TY - JOUR
AU - Tomović, Aleksandar
AU - Savić, J. J.
AU - Bakic, N. Lj.
AU - Bortel, G.
AU - Faigel, G.
AU - Žikić, Radomir
AU - Jovanović, Vladimir
PY - 2017
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5851
AB - Prolonged annealing of pentacene thin films in air leads to the formation of nano- and micro-scale rod-shaped structures at temperatures equal to or higher than 130 degrees C. Scanning electron microscopy measurements indicated their crystalline structure, while UV-vis absorption spectra revealed presence of different species of oxidized pentacene, including 6,13-pentacenequinone. The mechanism of growth of microcrystals from oxidized pentacene molecules is discussed. Raman and UV-vis absorption spectra dependences on film thickness (in 30-300 nm range) and on thermal annealing conditions (in air and nitrogen at ambient pressure at 100 and 150 degrees C) were also studied. These spectra are not largely affected by annealing if it is performed in nitrogen at any of studied temperatures and annealing times (few hours to few days). However, if annealing is performed in air, at temperatures 130 degrees C and higher, changes in spectral features are significant due to film oxidation.
PB - Pergamon-Elsevier Science Ltd, Oxford
T2 - Vacuum
T1 - Oxidized pentacene micro-rods obtained by thermal annealing of pentacene thin films in air
EP - 42
SP - 36
VL - 144
DO - 10.1016/j.vacuum.2017.07.012
ER -
@article{
author = "Tomović, Aleksandar and Savić, J. J. and Bakic, N. Lj. and Bortel, G. and Faigel, G. and Žikić, Radomir and Jovanović, Vladimir",
year = "2017",
abstract = "Prolonged annealing of pentacene thin films in air leads to the formation of nano- and micro-scale rod-shaped structures at temperatures equal to or higher than 130 degrees C. Scanning electron microscopy measurements indicated their crystalline structure, while UV-vis absorption spectra revealed presence of different species of oxidized pentacene, including 6,13-pentacenequinone. The mechanism of growth of microcrystals from oxidized pentacene molecules is discussed. Raman and UV-vis absorption spectra dependences on film thickness (in 30-300 nm range) and on thermal annealing conditions (in air and nitrogen at ambient pressure at 100 and 150 degrees C) were also studied. These spectra are not largely affected by annealing if it is performed in nitrogen at any of studied temperatures and annealing times (few hours to few days). However, if annealing is performed in air, at temperatures 130 degrees C and higher, changes in spectral features are significant due to film oxidation.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Vacuum",
title = "Oxidized pentacene micro-rods obtained by thermal annealing of pentacene thin films in air",
pages = "42-36",
volume = "144",
doi = "10.1016/j.vacuum.2017.07.012"
}
Tomović, A., Savić, J. J., Bakic, N. Lj., Bortel, G., Faigel, G., Žikić, R.,& Jovanović, V.. (2017). Oxidized pentacene micro-rods obtained by thermal annealing of pentacene thin films in air. in Vacuum
Pergamon-Elsevier Science Ltd, Oxford., 144, 36-42.
https://doi.org/10.1016/j.vacuum.2017.07.012
Tomović A, Savić JJ, Bakic NL, Bortel G, Faigel G, Žikić R, Jovanović V. Oxidized pentacene micro-rods obtained by thermal annealing of pentacene thin films in air. in Vacuum. 2017;144:36-42.
doi:10.1016/j.vacuum.2017.07.012 .
Tomović, Aleksandar, Savić, J. J., Bakic, N. Lj., Bortel, G., Faigel, G., Žikić, Radomir, Jovanović, Vladimir, "Oxidized pentacene micro-rods obtained by thermal annealing of pentacene thin films in air" in Vacuum, 144 (2017):36-42,
https://doi.org/10.1016/j.vacuum.2017.07.012 . .
