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A Novel Technique for the Selective Detection of Interfacial Species and the Investigation of Interaction at Metal/Solid and Metal/Liquid Interfaces

选择性检测界面物质和研究金属/固体和金属/液体界面相互作用的新技术

基本信息

批准号：
60470057
负责人：
SUETAKA Wataru
金额：
$ 3.65万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

项目摘要

Infrared ATR spectroscopy of the Kretschmann configuration is a potential tool for the in-situ observation of species at metal/solid and metal/liquid interfaces. The infrared absorption of species at the interfaces are observed remarkably enhanced, and the enhancement has been proved to be very short-ranged. The mechanism of the enhancement has been investigated in the present work, and we have been successful in arriving at the conclusion that the enhancement stems from the strong electromagnetic field of local plasmon induced at cavities in the metal film.We have applied this method to the investigation of species adsorbed on gold and silver electrodes, and were successful in observing in-situ the behavior of thiocyanate and cyanide ions adsorbed on the electrodes in changing the electrode potential. No signal of species in solution was appeared in the recorded spectra, showing that this method is excellent for the selective detection of interface species.Nickel can be used as the thin metal film in the Kretschmann configuration. However, the enhancement is low in comparison to the noble metals (Au, Ag, Cu), and infrared absorptions are recorded as the increase in reflectivity provided the metal film is continuous.

Kretschmann构型的红外ATR光谱是一种潜在的原位观察金属/固体和金属/液体界面物种的工具。在界面处观察到物种的红外吸收显著增强，并且这种增强被证明是很短的。本文对这种增强的机理进行了探讨，并成功地得出了这种增强是由于金属膜中空穴处诱导的局域等离子体强电磁场的结论。我们将这种方法应用于金和银电极上吸附物种的研究，并成功地原位观察了吸附在电极上的硫氰酸盐和氰离子改变电极电位的行为。在记录的光谱中没有出现溶液中物种的信号，这表明该方法对于界面物种的选择性检测是很好的，镍可以作为Kretschmann构型中的金属薄膜。然而，与贵金属(金、银、铜)相比，这种增强作用较小，并且在金属膜连续的情况下，红外吸收随着反射率的增加而记录。