Abstract
Copper foils for a Raman study were prepared by a chemical etching method with HNO<sub>3</sub>. These foils were found to exhibit a strong SERS effect, SERS or SERRS spectra of cobalt phthalocyanine, cystamine dihydrochloride, benzylamine, and <i>p</i>-thiocresol have been taken to illustrate the usefulness of this sample preparation technique. The enhancement effect of HNO<sub>3</sub>-roughened copper foil shows better thermal stability than that of vacuum-deposited Ag/CaF<sub>2</sub> substrate. The HNO<sub>3</sub>- 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.
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