On the structure and evolution of the buried S/Au interface in self-assembled monolayers: X-ray standing wave results

P. Fenter*, F. Schreiber, L. Berman, G. Scoles, P. Eisenberger, M. J. Bedzyk

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

161 Scopus citations

Abstract

We describe a structural study of the S/Au interface for decanethiol monolayers (C10) on a Au(111) surface using the technique of X-ray standing waves (XSWs). The XSW results for full-coverage monolayers are inconsistent with any model incorporating a single sulfur adsorption site, such as the widely assumed threefold hollow site on the Au(111) surface. Instead, the XSW results reveal two distinct sulfur head group sites, each with a distinct lateral and vertical location with respect to the underlying gold lattice. We discuss structural models that are consistent with these results. We have also studied the evolution of the structure versus coverage with XSW and X-ray photoelectron spectroscopy (XPS) and have determined that the local S/Au interface structure of the "lying down" striped phase at low coverages (0.27 ML, 1 ML = 4.62 × 1014 molecules cm-2) is indistinguishable from that of the "standing up" c(4 x 2) phase at saturation (1 ML). Some important implications concerning the structure and growth of these monolayers are discussed.

Original languageEnglish (US)
Pages (from-to)213-235
Number of pages23
JournalSurface Science
Volume412-413
DOIs
StatePublished - Sep 3 1998

Keywords

  • Decanethiol
  • Gold
  • Metal-organic interfaces
  • Self-assembly
  • Single crystal surfaces
  • Surface structure, morphology, roughness, and topography
  • X-ray standing waves

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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