Anisotropy and Raman absorption of the polyimide surface irradiated by the ion beam for liquid crystal alignment
| Autor: | Phil Kook Son, Bong Kyun Jo, Jae Chang Kim, Jeung Hun Park, Sung Pil Lee, Joong Ha Lee, Taek Joon Lee, Moonhor Ree, Tae-Hoon Yoon |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
Metals and Alloys Analytical chemistry Surfaces and Interfaces Surfaces Coatings and Films Electronic Optical and Magnetic Materials Amorphous solid symbols.namesake Liquid crystal Ellipsometry Materials Chemistry symbols Absorption (chemistry) Raman spectroscopy Anisotropy Raman scattering Polyimide |
| Zdroj: | Thin Solid Films. 517:1803-1806 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2008.09.084 |
| Popis: | In this paper, polyimide surfaces irradiated by an ion-beam for liquid crystal alignment are investigated by using atomic force microscopy, Raman spectroscopy, and spectroscopic ellipsometry. A liquid crystal cell aligned homogeneously through the ion-beam exposure exhibits electro-optic switching behavior similar to that of a rubbing-aligned liquid crystal cell. However, we found that the surface morphology and bonding molecules of ion-beam-treated polyimide surfaces show properties very different from mechanically-rubbed ones. Experimental results show that optical anisotropy of ion-beam-treated polyimide surfaces results in the formation of hydrogenated amorphous carbon-like structure with a short main-chain, while mechanical rubbing has little effect on structural and compositional variations of polyimide layers. |
| Databáze: | OpenAIRE |
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