Copper foils for a Raman study were prepared by a chemical etching method with HNO3. These foils were found to exhibit a strong SERS effect, SERS or SERRS spectra of cobalt phthalocyanine, cystamine dihydrochloride, benzylamine, and p-thiocresol have been taken to
illustrate the usefulness of this sample preparation technique. The enhancement effect of HNO3-roughened copper foil shows better thermal stability than that of vacuum-deposited Ag/CaF2 substrate. The HNO3- roughened copper foil seems to be a more easily prepared
substrate system for SERS studies. There is a high potential that this technique could be used in studies of adsorption, molecular orientation, surface reaction, and surface catalysis at room or elevated temperatures.
Department of Chemistry, Nanjing University, Nanjing 210008, People's Republic of China
Publication date: June 1, 1991
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