Abstract: The surface enhanced Raman scattering (SERS) of pyridine adsorbed on a n-CdS electrode in an aqueous KC1 solution has been stud ied. When the CdS electrode was first subjected to anodization for ca. 5 min under illumination, the two strong peaks at 1010 and 1036 cm^-2 in the SERS spectrum of the adsorbed pyridine were observed. Compared with the characteristic peaks (at 991 and 1030 cm^-1) in the Raman spectrum of pure pyridine they show obvious shifts. The surface Raman signal intensity was enhanced with increasing pyridine concentration. The effect of applied electrode potential on the SERS was also investigated. It shows that shape of its curve is similar to the I-V curve measured on the CdS electrode. The above results were briefly explained and discussed.

Key words: surface enhanced Raman scattering, pyridine, n-CdS electrode