Effects of ion beam surface modification on water absorption characteristics of perfluorosulfonic acid membranes

B. Tsuchiya, S. Nagata, K. Saito, Tatsuo Shikama

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The dynamic behavior of water within ion beam (10 keV Ar +, 1.0 × 10 16-1.2 × 10 17 ions/cm 2) modified perfluorosulfonic acid (PFSA) membranes was investigated at room temperature by combining direct-current (DC) resistance with alternative-current (AC) impedance methods under a water-saturated air atmosphere. The bulk impedance in existing surface sulfonate groups (SO 3 -) decreased approximately one order of magnitude as a result of Ar + ion irradiation compared to the unirradiated membrane. The enhancement in the proton conductivity results in an improvement of the water absorption characteristics at the Ar + ion-modified surface which showed large superficies as well as hydrophilic radicals. These results can be explained in base of a relative increase in both the water content of the membrane and the change in the interactions of water molecules with sulfonate group at the interface on the proton-transfer process.

Original languageEnglish
Pages (from-to)225-228
Number of pages4
JournalVacuum
Volume89
Issue number1
DOIs
Publication statusPublished - 2013 Mar

Keywords

  • Optical absorption
  • Perfluorosulfonic acid (PFSA) membranes
  • Proton conductivity
  • Water absorption

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

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