Ion-beam irradiation effects on polyimide-UV–vis and infrared spectroscopic study |
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| Authors: | H. Kudo S. Sudo T. Oka Y. Hama A. Oshima M. Washio T. Murakami |
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| Affiliation: | 1. Graduate School of Engineering, The University of Tokyo, 2-22 Shirakata-Shirane, Tokai, Naka, Ibaraki 319-1188, Japan;2. National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan;3. Advance Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Sinjuku, Tokyo 169-8555, Japan;4. Department of Accelerator and Medical Physics, National Institute of Radiological Sciences, 4-9-1, Anagawa, Inage, Chiba 263-8555, Japan;1. The University of Tokyo, ASRC/JAEA, Japan;2. Waseda University, Japan;1. Advanced Material Research Center, Samsung Advanced Institute of Technology (SAIT), Yongin-si, Gyeonggi 446-712, South Korea;2. Material & Device Research Center, Samsung Advanced Institute of Technology (SAIT), Yongin-si, Gyeonggi 446-712, South Korea;1. School of Chemical Engineering, University of Science and Technology Liaoning, 185 Qianshan Zhong Road, Gaoxin District, Anshan 114051, Liaoning, China;2. State Key Laboratory of Fine Chemicals, Carbon Research Laboratory, School of Chemical Engineering, Dalian University of Technology, Dalian 116012, Liaoning, China;1. "Petru Poni" Institute of Macromolecular Chemistry, Polycondensation and Thermostable Polymers Department, Aleea Grigore Ghica Voda 41A, Iasi, 700487, Romania;2. Demidov Yaroslavl State University, ul. Sovestkaya 14, Yaroslavl, 150000, Russia;1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, China;2. Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd., 8 Zuoling Avenue, Wuhan, 430078, China;1. School of Materials Science & Chemical Engineering, Ningbo University, Ningbo 315211, China;2. Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Science, Ningbo 315201, China;3. College of Science & Technology, Ningbo University, Cixi 315300, China |
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| Abstract: | Ion-beam irradiation effects on polyimide, Kapton™, were studied with respect to optical and electronic properties. Stack films of Kapton™ (12.5 μm thick) were irradiated to various ion beams in air or vacuo at room temperature and subjected to ultraviolet–visible (UV–vis) spectroscopy, and change in absorbance and energy gap is discussed. The UV–vis absorption spectrum, which is assigned to the transition of electrons in benzene rings from π to π* orbital, upon He2+ (6 MeV/u) irradiation in air, shifted towards longer wavelength direction for all cases, and the shift was more obvious for higher linear energy transfer (LET) ion beams. The energy gap of the transition was estimated, and the H+ and He2+ ion beams caused little change in the transition energy gap Eg, while the heavier ions such as C6+ and Si14+ caused more significant decrease. This decrease is assumed to the structural changes around benzene rings, and the infrared spectroscopy revealed breakage in imide groups next to benzene ring in the repeating unit of polyimide. |
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| Keywords: | Ion beam Polyimide UV– vis spectroscopy Energy gap Infrared spectroscopy |
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