Reactions of water and methanol at hydrogen-terminated silicon surfaces studied by transmission FTIR

被引:38
作者
Bateman, JE
Horrocks, BR
Houlton, A
机构
[1] Department of Chemistry, University of Newcastle Upon Tyne, Newcastle upon Tyne
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1997年 / 93卷 / 14期
关键词
D O I
10.1039/a701286a
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
A simple method for studying the reactivity of hydrogen-terminated silicon surfaces via transmission FTIR spectroscopy is described. Abraded (100) single crystals of silicon, after etching in ammonium fluoride, show features in the IR spectrum that are assigned to Si-H stretching vibrations. Confirmation of the utility of this approach is demonstrated in the reactions of the Si-H surfaces with water and methanol. Native-oxide growth in the former case is evidenced by the appearance of two bands in the Si-O stretch region accompanied by a shift to higher frequency of the longitudinal polar Si-O vibrational mode with increased exposure, consistent with an island-growth model. Similarly, the reaction with methanol generates two bands in the Si-O stretch region. However, the frequency and behaviour of these bands on further exposure to methanol are consistent with a chemisorbed methoxy species with little oxidation taking place, contrary to previous reports.
引用
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页码:2427 / 2431
页数:5
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