ESR study for ion beam induced phenomena in poly (tetrafluoroethylene-co-hexafluoropropylene) (FEP)

Taeko Yoshikawa, Akihiro Oshima, Takeshi Murakami, Masakazu Washio

    Research output: Contribution to journalArticle

    Abstract

    Trapped radicals induced in poly (tetrafluoroethylene-co-hexafluoropropylene) (FEP) were observed by X-band electron spin resonance (ESR) spectroscopy at room temperature (RT) under atmospheric field after an irradiation with various kinds of high energy ion beams (6MeV/u). The irradiation was carried out to a stacked FEP films under vacuum (<4E-4Pa) at RT with various fluences from 1.0×10 9 to 1.0×10 11ions/cm 2. All ESR spectra indicated an existence of peroxy radicals in each of the FEP films without any relation to a kind of ion and a penetration depth. Obtained depth profiles of radical concentrations induced with each ion beam almost correspond to those of stopping power. The trapped radical concentrations were strongly dependent on stopping power. It was found that G-value of trapped radicals by ion beam irradiation was decreased with increasing a stopping power, and was less than the case of gamma-rays irradiation.

    Original languageEnglish
    Pages (from-to)1904-1909
    Number of pages6
    JournalRadiation Physics and Chemistry
    Volume81
    Issue number12
    DOIs
    Publication statusPublished - 2012 Dec

    Fingerprint

    polytetrafluoroethylene
    electron paramagnetic resonance
    ion beams
    stopping power
    irradiation
    room temperature
    superhigh frequencies
    fluence
    penetration
    gamma rays
    vacuum
    profiles
    spectroscopy
    ions
    energy

    Keywords

    • ESR
    • FEP
    • G-value
    • Ion beam
    • Stopping power
    • Trapped radical

    ASJC Scopus subject areas

    • Radiation

    Cite this

    ESR study for ion beam induced phenomena in poly (tetrafluoroethylene-co-hexafluoropropylene) (FEP). / Yoshikawa, Taeko; Oshima, Akihiro; Murakami, Takeshi; Washio, Masakazu.

    In: Radiation Physics and Chemistry, Vol. 81, No. 12, 12.2012, p. 1904-1909.

    Research output: Contribution to journalArticle

    Yoshikawa, Taeko ; Oshima, Akihiro ; Murakami, Takeshi ; Washio, Masakazu. / ESR study for ion beam induced phenomena in poly (tetrafluoroethylene-co-hexafluoropropylene) (FEP). In: Radiation Physics and Chemistry. 2012 ; Vol. 81, No. 12. pp. 1904-1909.
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