Molecular-Scale Characterization of the Reaction of Ozone with Decanethiol Monolayers on Au(111)
Molecular-Scale Characterization of the Reaction of Ozone with Decanethiol Monolayers on Au(111)
复制标题
臭氧与 Au(111) 上癸硫醇单层反应的分子尺度表征
DOI：
10.1021/ja991739f
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发表时间：
1999
影响因子：
15
通讯作者：
M. Tarlov
中科院分区：
文献类型：
--
作者：
G. Poirier;T. Herne;C. C. Miller;M. Tarlov
用X射线光电子能谱和扫描隧道显微镜研究了臭氧与正癸烷醇在Au（111）表面单分子膜的化学反应。我们的研究结果表明，暴露于臭氧中的巯基末端的氧化的结果。该反应起始于链烷醇单分子层的畴界网络，并传播到畴中。在阈值表面氧含量以上，单层转化为二维流体，其随后可以重结晶为部分氧化的硫醇的相称单层。进一步暴露于臭氧导致单层转化为流体相，并且在Au-硫醇界面处的Au晶格膨胀10%至30%，伴随着Au岛的形成。我们的研究结果表明，单层膜中的晶体缺陷可以发挥重要的作用，在其化学反应。
The chemical reaction of ozone with decanethiol monolayers on Au(111) was characterized using X-ray photoelectron spectroscopy and scanning tunneling microscopy. Our results show that exposure to ozone results in oxidation of the thiol terminus. The reaction initiates at the domain boundary network of the alkanethiol monolayer and propagates into the domains. Above a threshold surface oxygen content, the monolayer converts to a two-dimensional fluid that can subsequently recrystallize to a commensurate monolayer of partially oxidized thiol. Further exposure to ozone results in conversion of the monolayer to a fluid phase and a 10% to 30% expansion of the Au lattice at the Au−thiol interface with concomitant formation of Au islands. Our results demonstrate that crystallographic defects in monolayer films can play an important role in their chemical reactions.