Simple methods for preparation of a well-defined 4-pyridinethiol modified surface on Au(111) electrodes for cytochrome c electrochemistry

Isao Taniguchi, Soichiro Yoshimoto, Masahito Yoshida, Shun ichi Kobayashi, Toshifumi Miyawaki, Yutaka Aono, Yukinari Sunatsuki, Hideo Taira

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

A very small amount of sulfide impurity in 4-pyridinethiol (4-PySH) modifier solution was found to interfere with the proper formation of the 4-PySH modified surface for cytochrome c electrochemistry on an Au(111) electrode. When the modification was conducted in an alkaline (e.g. 0.1 M KOH) solution, in aqueous solutions under applying a potential more positive than 0.3 V vs. Ag/AgCl, or at a low modifier concentration (e.g. 20 μM), the proper 4-PySH modified surface was obtained even using 4-PySH as received, which contained a small amount of sulfide. The selective adsorption of 4-PySH in the presence of a small amount of sulfide under these conditions was due to the rapid formation of proper 4-PySH modified surface, which prevented the sulfide from reacting with the electrode surface.

Original languageEnglish
Pages (from-to)2843-2853
Number of pages11
JournalElectrochimica Acta
Volume45
Issue number18
DOIs
Publication statusPublished - Jun 9 2000
Externally publishedYes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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