Raman study on the structure of 3-mercaptopropionic acid monolayers on silver

被引:40
|
作者
Kudelski, A [1 ]
机构
[1] Univ Warsaw, Dept Chem, PL-02093 Warsaw, Poland
关键词
Raman scattering spectroscopy; self-assembly; silver; carboxylic acid;
D O I
10.1016/S0039-6028(01)01947-1
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
The influence of pH on the structure of 3-mercaptopropionic acid (MPA) monolayers on silver, and the changes in the structure of monolayers during adsorption and desorption of MPA molecules were investigated by surface-enhanced Raman scattering. The measurements were carried out in aqueous solutions. It was demonstrated that during the self-assembling of the monolayer there was a significant increase in the portion of a trans conformer of S-C-C chains of adsorbed MPA molecules, and a large portion of the COO- groups of the adsorbed MPA molecules was protonated. The strength of adsorbed acid clearly depends on its surface concentration. Desorption of MPA progressed at a slow rate and significant changes (reverse to the changes during adsorption) were observed after more than I h. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:219 / 223
页数:5
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