Structure-dependent change of desorption species from n-alkanethiol monolayers adsorbed on Au(111):: Desorption of thiolate radicals from low-density structures

被引：60

作者：

Kondoh, H ^{[1
]}

Kodama, C ^{[1
]}

Nozoye, H ^{[1
]}

机构：

[1] Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 3058565, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1998年 / 102卷 / 13期

关键词：

D O I：

10.1021/jp980175j

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 coverage dependence of desorption behavior of n-alkanethiol monolayers on Au(111) has been studied using thermal desorption spectroscopy (TDS) together with scanning tunneling microscopy (STM) to investigate the molecule-substrate interactions. STM observations indicated four different phases during the growth. We present for the first time evidence for a drastic coverage-dependent change of desorption species, which is parallel with a structure change from a low-density phase to a denser phase: while the thiolates in the latter phase bimolecularly desorb as disulfides, those in the former phase unimolecularly desorb as thiolate radicals.

引用

页码：2310 / 2312

页数：3

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