UV-Photoinduced Surface Anisotropy of Polyimide Studied by Near-Edge X-Ray Absorption Fine Structure Spectroscopy
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概要
- 論文の詳細を見る
Anisotropic alignment of polyimide chains induced by linearly polarized deep UV (LPDUV) irradiation was studied by near-edge X-ray absorption fine structure (NEXAFS) spectroscopy in the total electron yield (TEY) and partial electron yield (PEY) acquisition modes. The degree of the alignment manifested by the intensity of O K-edge $\pi^{*}$ resonance of a C=O group is noticeably higher in the PEY acquisition mode than in the TEY one. The maximum anisotropy (linear dichroic ratio ${\sim}10$%) in the former case is observed at a lower exposure (${\sim}0.6$ J/cm2) than in the latter case (${\sim}2$ J/cm2). Considering the difference in electron escape depth between PEY (${\sim}2$ nm) and TEY (${\sim}3.5$ nm), we can conclude that the LPDUV-irradiated polyimide film exhibits depth dependence of anisotropy. The irradiation dependence of the PEY-derived anisotropy and the order parameter of liquid crystals (LC) showed good agreement, indicating that the anisotropy in the surface region is of major importance for LC alignment.
- INSTITUTE OF PURE AND APPLIED PHYSICSの論文
- 2003-01-15
著者
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Ishii Hisao
Research Institute Of Electrical Communication Tohoku University
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SEKI Kazuhiko
Research Center for Materials Science, Nagoya University
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Oji Hiroshi
Department Of Vacuum Uv Photoscience Institute For Molecular Science
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Ouchi Yukio
Department Of Chemistry Graduate School Of Science Nagoya University
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Zharnikov Michael
Department Of Applied Physical Cehmistry University Of Heidelberg
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Ito Eisuke
Local Spatio-temporal Function Frontier Research System The Institute Of Physical And Chemical Resar
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Hasegawa Masaki
Ibm Research Tokyo Research Laboratory
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Matsuie Noritaka
Department Of Chemistry Graduate School Of Science Nagoya University
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Ouchi Yukio
Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
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Zharnikov Michael
Department of Applied Physical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, Heidelberg D-69120, Germany
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Ishii Hisao
Research Institute of Electrical Communication (RIEC), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Oji Hiroshi
Department of Vacuum UV Photoscience, Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
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