Corrosion of gold by alkane thiols

被引：44

作者：

Edinger, K ^{[1
]}

Grunze, M ^{[1
]}

Woll, C ^{[1
]}

机构：

[1] Lehrstuhl Angew Phys Chem, D-69120 Heidelberg, Germany

来源：

BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 1997年 / 101卷 / 12期

关键词：

adsorption; chemical kinetics; interfaces; self assembled monolayers; surfaces;

D O I：

10.1002/bbpc.19971011204

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：

STM images of self assembled alkanethiol films on gold surfaces show holes which have been identified as vacancies in the topmost gold layer. We show that this vacancy formation is accompanied by a corrosion process of gold in ethanolic thiol solutions. The amount of dissolved gold from polycrystalline substrates as a function of immersion lime, thiol concentration, chain length and solvent has been investigated by Atomic Absorption Spectroscopy (AAS). The results suggest that the thiol molecule itself is the active oxidant. In case of a 1 mmol solution of docosanethiol in ethanol a gold concentration corresponding to 6% of a gold monolayer has been detected after an immersion Lime of 24 h. By using hexane as a solvent the amount of dissolved gold is reduced to less than 0.2%, indicating a strong solvent (e.g. polarity) dependence for the corrosion process. The kinetics of the corrosion process have been measured and compared to kinetic data related to the formation of an ordered thiol film.

引用

页码：1811 / 1815

页数：5

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