The local adsorption structure of methylthiolate and butylthiolate on Au(111): A photoemission core-level shift investigation

被引：20

作者：

Chaudhuri, A. ^{[1
]}

Lerotholi, T. J. ^{[1
]}

Jackson, D. C. ^{[1
]}

Woodruff, D. P. ^{[1
]}

Dhanak, V. R. ^{[2
,3
]}

机构：

[1] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[2] SERC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England

[3] Univ Liverpool, Surface Sci Res Ctr, Warrington WA4 4AD, Cheshire, England

来源：

SURFACE SCIENCE | 2010年 / 604卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

Chemisorption; Self-assembly; Gold; Thiols; SELF-ASSEMBLED MONOLAYERS; DENSITY-FUNCTIONAL THEORY; ADSORBATE STRUCTURE DETERMINATION; PHOTOELECTRON DIFFRACTION; SURFACES; GOLD; ALKANETHIOLS; SITE; COVERAGE; SULFUR;

D O I：

10.1016/j.susc.2009.11.010

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 (root 3 x root 3)R30 degrees) 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. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：227 / 234

页数：8

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