Studying thiol adsorption on Au, Ag and Hg surfaces by potentiometric measurements

Meirav Cohen-Atiya, Daniel Mandler*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

The adsorption of thiols on different metal surfaces has been studied using potentiometric measurements. The adsorption is a complex process that comprises a few steps. The first involves negative charge transfer to the electrode surface as evidenced by a sharp negative shift of the open circuit potential (ocp). The charge that is accumulated on the electrode surface is discharged through a reduction process that involves either water or oxygen reduction. The rate of the discharging process depends strongly on the overpotential of the electrode material for water reduction, the medium, and to some extent, on additional functional groups that the thiol bears. A detailed general mechanism that is in agreement with our findings is proposed and discussed.

Original languageAmerican English
Pages (from-to)267-276
Number of pages10
JournalJournal of Electroanalytical Chemistry
Volume550-551
DOIs
StatePublished - 17 Jul 2003

Bibliographical note

Funding Information:
This work was supported by the DFG in the frame of Tri-Lateral Projects.

Keywords

  • Ag
  • Au
  • Hg
  • Open circuit potential
  • Potentiometry
  • Self-assembled monolayers
  • Thiols

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