Adsorption of Methanol on Si(001): Reaction Channels and Energetics
Adsorption of Methanol on Si(001): Reaction Channels and Energetics
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DOI：
10.1021/acs.jpcc.8b04583
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发表时间：
2018-07-05
影响因子：
3.7
通讯作者：
Duerr, Michael
中科院分区：
文献类型：
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作者：
Laenger, Christian;Bohamud, Tamam;Duerr, Michael
用X射线光电子能谱（XPS）、分子束技术和扫描隧道显微镜（STM）研究了表面温度为50 ~ 800 K时甲醇在Si（001）表面的吸附。即使在最低温度下，也只有最终反应产物，即，在XPS和STM实验中观察到硅键合甲氧基和Si-H实体。然而，初始粘附概率随表面温度的增加而下降，表明反应通过中间状态进行。观察到两种最终构型的解离产物吸附在一个或两个硅二聚体上;它们的分支比不随温度变化，表明两种途径非常相似，转化势垒低。
Adsorption of methanol on Si(001) was studied by means of X-ray photoelectron spectroscopy (XPS), molecular beam techniques, and scanning tunneling microscopy (STM) at surface temperatures between 50 and 800 K. Even at lowest temperatures, only the final reaction products, i.e., a silicon bound methoxy group and a Si-H entity, were observed in the XPS and STM experiments. However, the initial sticking probability drops with increasing surface temperature, indicating that the reaction proceeds via an intermediate state. Two final configurations with the dissociation products adsorbed either on one or two silicon dimers were observed; their branching ratio does not change with temperature, indicating very similar, low conversion barriers for the two pathways.