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

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(lll) 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, I ML=4.62 x 1014 molecules cm-2) is indistinguishable from that of the standing up c(4 x 2) phase at saturation (I ML). Some important implications concerning the structure and growth of these monolayers are discussed.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
ER
OSTI Identifier:
938283
Report Number(s):
ANL/ER/JA-28971
Journal ID: ISSN 0039-6028; SUSCAS; TRN: US200908%%167
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Surf. Sci.
Additional Journal Information:
Journal Volume: 425; Journal Issue: 1 ; Apr. 1999; Journal ID: ISSN 0039-6028
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; GOLD; SULFUR; INTERFACES; MORPHOLOGY; THIOLS; SORPTION; SORPTIVE PROPERTIES

Citation Formats

Fenter, P, Schreiber, F, Berman, L, Scoles, G, Eisenberger, P, Bedzyk, M J, Princeton Univ., Princeton Univ., Max-Planck Inst. fuer Metallforschung, BNL,, Columbia Univ., and Northwestern Univ. On the structure and evolution of the buried S/Au interface in self-assembled monolayers : x-ray standing wave results.. United States: N. p., 1999. Web.
Fenter, P, Schreiber, F, Berman, L, Scoles, G, Eisenberger, P, Bedzyk, M J, Princeton Univ., Princeton Univ., Max-Planck Inst. fuer Metallforschung, BNL,, Columbia Univ., & Northwestern Univ. On the structure and evolution of the buried S/Au interface in self-assembled monolayers : x-ray standing wave results.. United States.
Fenter, P, Schreiber, F, Berman, L, Scoles, G, Eisenberger, P, Bedzyk, M J, Princeton Univ., Princeton Univ., Max-Planck Inst. fuer Metallforschung, BNL,, Columbia Univ., and Northwestern Univ. Thu . "On the structure and evolution of the buried S/Au interface in self-assembled monolayers : x-ray standing wave results.". United States.
@article{osti_938283,
title = {On the structure and evolution of the buried S/Au interface in self-assembled monolayers : x-ray standing wave results.},
author = {Fenter, P and Schreiber, F and Berman, L and Scoles, G and Eisenberger, P and Bedzyk, M J and Princeton Univ. and Princeton Univ. and Max-Planck Inst. fuer Metallforschung and BNL, and Columbia Univ. and Northwestern Univ.},
abstractNote = {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(lll) 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, I ML=4.62 x 1014 molecules cm-2) is indistinguishable from that of the standing up c(4 x 2) phase at saturation (I ML). Some important implications concerning the structure and growth of these monolayers are discussed.},
doi = {},
journal = {Surf. Sci.},
issn = {0039-6028},
number = 1 ; Apr. 1999,
volume = 425,
place = {United States},
year = {1999},
month = {4}
}