title: Synergistic Formation of Radicals by Irradiation with Both Vacuum Ultraviolet and Atomic Hydrogen: A Real-Time In Situ Electron Spin Resonance Study.
abstract: We report on the surface modification of poly(tetrafluoroethylene) (PTFE) as an example of soft materials and biomaterials that occur under plasma discharge by kinetics analysis of radical formation using in situ real-time electron spin resonance (ESR) measurements. During irradiation with hydrogen plasma, simultaneous measurements of the gas-phase ESR signals of atomic hydrogen and the carbon dangling bond (C-DB) on PTFE were performed. Dynamic changes of the C-DB density were observed in real time, where the rate of density change was accelerated during initial irradiation and then became constant over time. It is noteworthy that C-DBs were formed synergistically by irradiation with both vacuum ultraviolet (VUV) and atomic hydrogen. The in situ real-time ESR technique is useful to elucidate synergistic roles during plasma surface modification.
authors: †Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
authors: Kenji
authors: K
authors: Ishikawa
authors: †Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
authors: Naoya
authors: N
authors: Sumi
authors: ‡Kanazawa Institute of Technology, 3-1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan.
authors: Akihiko
authors: A
authors: Kono
authors: ‡Kanazawa Institute of Technology, 3-1 Yatsukaho, Hakusan, Ishikawa 924-0838, Japan.
authors: Hideo
authors: H
authors: Horibe
authors: †Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
authors: Keigo
authors: K
authors: Takeda
authors: †Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
authors: Hiroki
authors: H
authors: Kondo
authors: †Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
authors: Makoto
authors: M
authors: Sekine
authors: †Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
authors: Masaru
authors: M
authors: Hori
keywords: UV photochemistry; atomic hydrogen; biomaterials; electron spin resonance; plasma discharge; poly(tetrafluoroethylene); vacuum ultraviolet radiation