Medium energy ion scattering investigation of methylthiolate-induced modification of the Au(111) surface

被引：8

作者：

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

Parkinson, G. S. ^{[1
]}

Hentz, A. ^{[1
]}

Window, A. J. ^{[1
]}

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

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

Bailey, P. ^{[2
]}

Noakes, T. C. Q. ^{[2
]}

机构：

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

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

来源：

SURFACE SCIENCE | 2011年 / 605卷 / 1-2期

基金：

英国工程与自然科学研究理事会;

关键词：

Medium energy ion scattering (MEIS); Surface structure; Self-assembly; Gold; Alkanethiols; SELF-ASSEMBLED MONOLAYERS; SCANNING-TUNNELING-MICROSCOPY; DENSITY-FUNCTIONAL THEORY; ADSORPTION SITE; GOLD ADATOMS; RECONSTRUCTION; ALKANETHIOLS; THIOLATE; CU(111); SULFUR;

D O I：

10.1016/j.susc.2010.10.011

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：

100 keV H+ scattering has been used to investigate the structure of the methylthiolate/Au(111) interface in the Au(111)(root 3 x root 3)R30 degrees phase. Adsorption of the thiolate onto the clean Au(111) surface leads to a large drop in the scattered ion yield due to the lifting of the clean surface 'herring-bone' reconstruction, but the thiolate-covered surface shows an ion yield higher than that of an unreconstructed Au(111) surface, providing direct evidence of a significant number of Au atoms that are displaced from their bulk-terminated positions at the buried interface. Simulations for two different Au adatoms models at the interface, namely, the Au-adatom-monothiolate (MM) and Au-adatom-dithiolate (MD) models, show significant sensitivity to the exact values of interlayer spacings and atomic vibrational amplitudes, but the comparison with experimental results appears to favour the MD model with 0.17 ML Au adatoms in bridging sites at the interface. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：138 / 145

页数：8

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