Chaudhuri, Anindita, Lerotholi, T. J., Jackson, D. C., Woodruff, D. P. and Dhanak, Vin. (2010) The local adsorption structure of methylthiolate and butylthiolate on Au(1 1 1): a photoemission core-level shift investigation. Surface Science, Vol.604 (No.2). pp. 227-234. ISSN 0039-6028

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Abstract

Measurements of the core-level shifts in Au 4f photoemission spectra from Au(1 1 1) at different coverages of methylthiolate and butylthiolate are reported. Adsorption leads to two components in addition to that from the bulk, one at lower photoelectron binding energy attributed to surface atoms not bonded to thiolate species, while the second component has a higher binding energy and is attributed to Au atoms bonded to the surface thiolate. The relative intensities of these surface components for the saturation coverage (mainly (√3 × √3)R30°) phases are discussed in terms of different local adsorption sites in a well-ordered surface, and favour adsorption of the thiolate species atop Au adatoms. Alternative interpretations that might be consistent with an Au-adatom-dithiolate model are discussed, particularly in the context of the possible influence of reduced coverage associated with a disordered surface. Marked differences from previously-reported results for longer-chain alkylthiolate layers are highlighted.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Chemisorption -- Research, Photoemission -- Research, Self-assembly (Chemistry), Gold -- Research, Thiols -- Research
Journal or Publication Title:	Surface Science
Publisher:	Elsevier BV
ISSN:	0039-6028
Date:	15 January 2010
Volume:	Vol.604
Number:	No.2
Page Range:	pp. 227-234
Identification Number:	10.1016/j.susc.2009.11.010
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/2645

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