Surface anisotropic electroreflectance response at an edge-plane pyrolytic graphite electrode

Takamasa Sagara, Hiroshi Nomaguchi, Naotoshi Nakashima

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We found that the potential-modulated UV-vis reflectance (electroreflectance, ER) spectrum measured with linearly polarized incident light at an edge-plane graphite (EPG) electrode with adsorbed redox species shows surface anisotropy. At a hemin or methylene blue-adsorbed EPG electrode, s-polarized incident light gave rise to greater ER response than p-polarized when the c axis of the graphite electrode is parallel to the plane of incidence, while when the c axis is perpendicular to the plane of incidence p-polarized light gave rise to greater response. The anisotropy was also observed for an EPG electrode coated with a Nafion film in which adsorptive species was incorporated. In contrast, methylviologen-incorporated Nafion films did not produce the anisotropy. The possible origin of the anisotropy was discussed in light of the surface morphology of the EPG as observed by the SEM.

Original languageEnglish
Pages (from-to)6393-6396
Number of pages4
JournalJournal of physical chemistry
Volume100
Issue number16
DOIs
Publication statusPublished - Apr 18 1996

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physical and Theoretical Chemistry

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