Cyanide adsorption on silver and gold overlayers on island films as determined by surface enhanced Raman scattering

Cherry A. Murray, Stephanie Bodoff

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Cyanide adsorption in air on silver, gold, and overlayers of gold on silver and silver on gold is investigated by surface enhanced Raman scattering, using island films to enhance the CN Raman scattering by ∼4 orders of magnitude. We studied pure metal island films as well as either silver or gold islands coated with the other metal with overlayer thicknesses ranging from 0.2 to 4 monolayers (Ml). We studied the coverage dependence of the cyanide adsorption for CN coverages ranging from 0.01 to ∼1 Ml. The Raman spectra reveal both considerable adsorption similarities and noteworthy differences for CN adsorption on the pure metals as compared to the overlayers. The spectra also reveal the order of adsorption of the CN into various possible sites, including the substrate metal sites. For each substrate system studied, we find two new distinct linear, on-top CN species adsorbed to two different types of surface site. The harmonic force constants and vibrational modes of the chemisorbed CN differ substantially on silver and gold, and are yet again different for the thin overlayer systems, due to the incomplete buildup of the overlayer three dimensional band structure.

Original languageEnglish (US)
Pages (from-to)573-584
Number of pages12
JournalThe Journal of chemical physics
Volume85
Issue number1
DOIs
StatePublished - 1986
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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