Air stability of alkanethiol self-assembled monolayers on silver and gold surfaces

Mark H. Schoenfisch, Jeanne E. Pemberton

Research output: Contribution to journalArticle

431 Scopus citations

Abstract

Surface Raman spectroscopy, electrochemistry, and X-ray photoelectron spectroscopy have been used to study the effects of air exposure on the stability of self-assembled monolayers (SAMs) formed from alkanethiols on mechanically polished, smooth Ag and Au surfaces. Ramancspectra exhibit oxidized sulfur modes after only hours of air exposure. X-ray photoelectron spectroscopy of the S 2p region porvides additional evidence for sulfur oxidaton. Cyclic voltammetry of Ru(NH3)(3+) indicates that oxidized alkanethiol SAMs retain blocking characteristics toward electron transfer, even after exposure of the oxidized SAM-surface to a solubilizing solvent. Control experiments suggest ozone as the primary oxidant in ambient laboratory air which causes rapid oxidation of the thiolate moiety. These results have important ramification for the general use of SAms in many proposed application.

Original languageEnglish (US)
Pages (from-to)4502-5413
Number of pages912
JournalJournal of the American Chemical Society
Volume120
Issue number18
DOIs
StatePublished - May 13 1998

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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