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

Mark H. Schoenfisch, Jeanne E Pemberton

Research output: Contribution to journalArticle

425 Citations (Scopus)

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

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Self assembled monolayers
Silver
Gold
Photoelectron Spectroscopy
Air
Sulfur
X ray photoelectron spectroscopy
Electrochemistry
Raman Spectrum Analysis
Ozone
Oxidants
Cyclic voltammetry
Raman spectroscopy
Electrons
Oxidation
Experiments

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Air stability of alkanethiol self-assembled monolayers on silver and gold surfaces. / Schoenfisch, Mark H.; Pemberton, Jeanne E.

In: Journal of the American Chemical Society, Vol. 120, No. 18, 13.05.1998, p. 4502-5413.

Research output: Contribution to journalArticle

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