TY - JOUR
T1 - Ion-beam irradiation effects on polyimide-UV-vis and infrared spectroscopic study
AU - Kudo, H.
AU - Sudo, S.
AU - Oka, T.
AU - Hama, Y.
AU - Oshima, A.
AU - Washio, M.
AU - Murakami, T.
N1 - Funding Information:
This work was supported by the research programs of High fluence Irradiation facility, the University of Tokyo (HIT), and Heavy Ion Medical Accelerator in Chiba (HIMAC), National Institute of Radiological Sciences (NIRS).
PY - 2009/12
Y1 - 2009/12
N2 - 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.
AB - 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.
KW - Energy gap
KW - Infrared spectroscopy
KW - Ion beam
KW - Polyimide
KW - UV-vis spectroscopy
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U2 - 10.1016/j.radphyschem.2009.06.020
DO - 10.1016/j.radphyschem.2009.06.020
M3 - Article
AN - SCOPUS:69949084206
SN - 0969-806X
VL - 78
SP - 1067
EP - 1070
JO - Radiation Physics and Chemistry
JF - Radiation Physics and Chemistry
IS - 12
ER -