Oxidized pentacene micro-rods obtained by thermal annealing of pentacene thin films in air
| Autor: | G. Bortel, Aleksandar Ž. Tomović, R. Zikic, G. Faigel, N.Lj. Bakić, Vladimir Jovanović, J.J. Savić |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Absorption spectroscopy Annealing (metallurgy) Scanning electron microscope Analytical chemistry Pentacene Optical spectroscopy 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound symbols.namesake Oxidation Thin film Instrumentation Thermal annealing Organic films 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 0104 chemical sciences Surfaces Coatings and Films chemistry 13. Climate action symbols Microstructures 0210 nano-technology Raman spectroscopy Ambient pressure |
| Zdroj: | Vacuum |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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