Abstract
Bimetallic films prepared by vacuum-depositing platinum onto silver island films have been evaluated for surface-enhanced Raman scattering (SERS), using CN − as the adsorbate. For platinum overlayers with mean thickness corresponding to 1–2 monolayers the spectrum is dominated by a band consistent with either CN − adsorbed at the platinum surface or with Pt(CN) 4 2−. For thinner platinum overlayers, changes in the spectra due to migration of CN − from Ag(CN) 2 − to the surface platinum atoms were observed during the first few minutes of laser illumination. Similar palladium-on-silver films showed a prominent SERS band assigned to surface Pd(CN) 4 2−.
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