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Anisotropy and Raman absorption of the polyimide surface irradiated by the ion beam for liquid crystal alignment |
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| Authors: | Phil Kook Son Bong Kyun Jo Joong Ha Lee Tae-Hoon Yoon Taek Joon Lee |
| Affiliation: | a School of Electronics Engineering, Pusan National University, Busan 609-735, Republic of Korea b Department of Materials Science and Engineering, University of California at Los Angeles, Los Angeles, CA 90095, USA c Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea |
| Abstract: | 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. |
| Keywords: | Raman scattering Polymers Ellipsometry Atomic force microscopy Liquid crystals Polyimide |
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