Abstract
Recent investigations in this laboratory on surface enhanced Raman scattering (SERS) from H 2O, Ag 0−X −, and pyridine species adsorbed on Ag electrodes in 1 M KX (X=Cl, Br, I, and F) electrolytes are reviewed. Use of an optical multichannel analyzer has allowed simultaneous monitoring of the SERS peaks over a 1200 cm −1 range as the electrode potential is continuously cycled through the oxidation-reduction cycle (ORC) or is repeatedly cycled in a nonfaradaic region of the ORC. Laser-induced changes in the SERS intensities, electrode surface morphologies, and cyclic voltammograms are noted. The results indicate potential dependent competition among the adsorbates for sites on the Ag surface. The voltage dependence of the irreversible loss in the enhancement factor provides evidence for the role of adatoms in the SERS enhancement mechanism.
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