POTENTIAL DEPENDENCE OF THE SURFACE SELF-DIFFUSION COEFFICIENT ON AU(100) IN SULFURIC-ACID-SOLUTION MEASURED BY ATOMIC-FORCE MICROSCOPY

被引：32
|
作者：
IKEMIYA, N
NISHIDE, M
HARA, S
机构：
[1] Department of Materials Science and Processing, Faculty of Engineering, Osaka University, Suita, 565
来源：
SURFACE SCIENCE | 1995年 / 340卷 / 1-2期
关键词：
ATOMIC FORCE MICROSCOPY; GOLD; ION EMISSION; METAL-ELECTROLYTE INTERFACES; SOLID-LIQUID INTERFACES; SURFACE DIFFUSION; SURFACE STRUCTURE;
D O I：
10.1016/0039-6028(95)00788-1
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：
We have measured the surface self-diffusion coefficient, D-s values on Au(100) in aqueous 50mM H2SO4 by using electrochemical atomic force microscopy (ECAFM). It was found that the D-s minimum appears around the potential of zero charge for the Au(100)-(1X1) surface (E(PZC(1X1)) is approximately equal to 270 mV versus NHE). The minimum D-s value of 10(-15) cm(2) s(-1) around the E(PZC(1X1)) agrees well with the extrapolated D-s value under the vapor phase. The results have shown that the potential dependence of the D-s values can be explained by considering not only the anion adsorption but also the role of excess charge densities at the Au(100) surface in altering the interatomic Au-Au bonds.
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页码：L965 / L970
页数：6
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