Abstract
SERS from pyridine on an Ag electrode is almost completely quenched by underpotential deposition of TI to a surface coverage of ≈ 3%. Removal of TI by anodic stripping does not restore the original SERS intensity. These results suggest that only a small fraction of adsorbed pyridine molecules is SERS active, and TI is specifically deposited on such a SERS active site, which then undergoes irreversible destruction. Pb appears to be non-specifically deposited on the Ag surface, but exhibits a similar irreversible quenching of SERS.
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