Monolayer Films Prepared by the Spontaneous Self-Assembly of Symmetrical and Unsymmetrical Dialkyl Sulfides from Solution onto Gold Substrates: Structure, Properties, and Reactivity of Constituent Functional Groups

Ernest B. Troughton, Colin D. Bain, George M. Whitesides, Ralph G. Nuzzo, David L. Allara, Marc D. Porter

Research output: Contribution to journalArticle

Abstract

Exposure of evaporated gold films supported on silicon wafers to solutions of dialkyl sulfides or alkanethiols in methanol or ethanol results in rapid formation of a monolayer of the organosulfur compound adsorbed onto the gold. The resulting films have been characterized by using a number of techniques, including X-ray photoelectron spectroscopy, infrared spectroscopy, ellipsometry, and wetting. These self-assembled, supported organic monolayer films are systems that can be used to study problems in the physical-organic chemistry and materials science of organic surfaces, especially the relation between the molecular-level structure of the film constituents and the macroscopic properties of the assembled monolayers. The films are relatively robust: examples formed from both dialkyl sulfides and alkanethiols withstand washing and prolonged soaking in neutral water, but films containing dialkyl sulfides are destroyed by contact with aqueous base at pH 8-13.

Original languageEnglish (US)
Pages (from-to)365-385
Number of pages21
JournalLangmuir
Volume4
Issue number2
DOIs
StatePublished - Mar 1 1988
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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