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L-cysteine chemisorption on gold:: an XPS and STM study

被引：146
作者：
Dodero, G
De Michieli, L
Cavalleri, O
Rolandi, R
Oliveri, L
Daccà, A
Parodi, R
机构：
[1] Univ Genoa, Dept Phys, Genoa, Italy
[2] Univ Genoa, INFM, Genoa, Italy
[3] Univ Genoa, Ist Nazl Fis Nucl, Genoa, Italy
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2000年 / 175卷 / 1-2期
关键词：
self-assembled monolayers (SAMs); L-cysteine; gold; X-ray photoelectron spectroscopy (XPS); scanning tunnelling microscopy (STM);
D O I：
10.1016/S0927-7757(00)00521-5
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：
L-Cysteine has been deposited on Au(lll) surfaces from the solution phase. Chemical and structural information on the L-cysteine/Au(lll) interface have been obtained by X-ray photoelectron spectroscopy (XPS) and scanning tunnelling microscopy (STM). XPS measurements provided a chemical characterisation of the interface. The deconvolution of the Au4f and S2p core level regions reveals a peak splitting, which can be explained by the formation of a chemical bond between the cysteine thiol group and the gold surface. The analysis of the N1s spectrum indicates that L-cysteine is present in the zwitterionic state. The STM structural characterisation performed in air at room temperature reveals that the molecular chemisorption results in the lifting of the (22 x root 3) gold reconstruction accompanied by the formation of depressions, a few nm in size, one gold layer in depth, as in alkanethiol/Au(lll) systems. Molecular resolution images show that the L-cysteine overlayer forms a hexagonal lattice, which, in a few regions, presents a striped modulation. (C) 2000 Elsevier Science B.V. All rights reserved.
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页码：121 / 128
页数：8
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