Long-range substrate effects on the stability and reactivity of thiolated self-assembled monolayers

被引：40

作者：

Aqua, Tali ^{[1
]}

Cohen, Hagai ^{[1
]}

Vilan, Ayelet ^{[1
]}

Naaman, Ron ^{[1
]}

机构：

[1] Weizmann Inst Sci, Dept Chem Phys & Chem Res Support, IL-76100 Rehovot, Israel

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 44期

关键词：

D O I：

10.1021/jp071606d

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 reactivity of the tail group of molecules absorbed in a self-assembled monolayer is affected significantly by the substrate through long-range charge redistribution occurring during the adsorption. Alkyl dithiol monolayers on GaAs are highly stable as compared to monolayers of monothiols on GaAs or dithiols on gold X-ray photoelectron spectroscopy (XPS) measurements reveal fairly weak binding of monothiol layers on GaAs, prone to rapid oxidation at the molecule - substrate interface. This is in contrast with the high stability of monothiols on gold. However, in the case of dithiols, the situation is reversed. When adsorbed on gold, the top thiol group tends to oxidize, whereas on GaAs, it does not. Furthermore, the monolayer was found to be stable in ambient for months. Contact potential difference (CPD) measurements showed a significant difference in charge distribution on the monolayers adsorbed on the two substrates, gold and GaAs. The change in reactivity and stability is attributed to the difference in the substrate-induced charge distribution across the adsorbed molecules.

引用

页码：16313 / 16318

页数：6

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