Effect of Underpotentially Deposited Lead on the SERS of Chloride, Bromide, and Thiocyanate Adsorbed at Silver Electrodes: Evidence for Chemical Contributions to SERS

Jeanne E. Pemberton, José C. Coria-garcia, Rebecca L. Hoff

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

A study of the effect of underpotentially deposited Pb on the SERS of Cl-, Br-, and SCN-adsorbed at Ag electrodes is presented in this report. The quenching behavior of the SERS of these adsorbates by the deposited Pb is different for each adsorbate. The SERS of SCN-is quenched rapidly by very small amounts of underpotentially deposited Pb, while the quenching for Br- and Cl- is less drastic. These results are interpreted in terms of a charge-transfer model for SERS that is sensitive to the changes in work function at microscopic sites upon Pb deposition. The charge-transfer process is envisioned to occur at sites of atomic scale roughness as has been previously postulated. Evidence for the importance of atomic scale roughness in these studies comes from the lack of reversibility of the SERS intensities after the deposition and quantitative stripping of greater than 60-70% of a Pb monolayer on the Ag surface. in total, these results suggest that chemical contributions to SERS are significant.

Original languageEnglish (US)
Pages (from-to)150-159
Number of pages10
JournalLangmuir
Volume3
Issue number2
DOIs
StatePublished - Mar 1 1987

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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