دورية أكاديمية
Structure control of poly(p-phenylene vinylene) in layer-by-layer films by deposition on a charged poly(o-methoxyaniline) cushion.
| العنوان: | Structure control of poly(p-phenylene vinylene) in layer-by-layer films by deposition on a charged poly(o-methoxyaniline) cushion. |
|---|---|
| المؤلفون: | Marletta, Alexandre, Curcino da Silva, Silésia de Fátima, Piovesan, Erick, Campos, K. R., Santos Silva, Hugo, de Souza, N. C., Letícia Vega, Maria, Raposo, Maria, Constantino, Carlos J. L, Silva, Raigna A., Oliveira, Osvaldo N. |
| المصدر: | Journal of Applied Physics; Apr2013, Vol. 113 Issue 14, p144509, 7p, 3 Diagrams, 1 Chart, 5 Graphs |
| مصطلحات موضوعية: | THIN film research, PHENYLENE compounds, ELECTRIC fields, RAMAN spectroscopy, MOLECULAR rotation |
| مستخلص: | In this paper, we demonstrate that the intrinsic electric field created by a poly(o-methoxyaniline) (POMA) cushion layer hinders the changes in molecular conformation of poly(p-phenylenevinylene) (PPV) in layer-by-layer with dodecylbenzene sulfonic acid (DBS). This was modeled with density functional theory (DFT) calculations where an energy barrier hampered molecular movements of PPV segments when they were subjected to an electric field comparable to that caused by a charged POMA layer. With restricted changes in molecular conformation, the PPV film exhibited Franck-Condon transitions and the photoexcitation spectra resembled the absorption spectra, in contrast to PPV/DBS films deposited directly on glass, with no POMA cushion. Other effects from the POMA cushion were the reduced number of structural defects, confirmed with Raman spectroscopy, and an enhanced PPV emission at high temperatures (300 K) in comparison with the films on bare glass. The positive effects from the POMA cushion may be exploited for enhanced opto-electronic devices, especially as the intrinsic electric field may assist in separating photoexcited electron-hole pairs in photovoltaic devices. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Applied Physics is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| قاعدة البيانات: | Complementary Index |
Find this article in full text from Scitation. كن أول من يترك تعليقا!