Abstract
AbstractSurface‐enhanced Raman scattering (SERS) has been observed for poly(4‐vinyl pyridine) absorbed onto silver island films. Bands near 1219 and 1613 cm−1, which are weak in normal Raman spectra of PVP, are strong in SERS spectra, and the band near 1020 cm−1, which is the strongest band in the normal spectra, is relatively weak in SERS. The strongest bands in the SERS spectra all belong to the same symmetry species as αZZ, implying that the pyridine moieties are adsorbed through the nitrogen atoms with a vertical conformation. The ring breathing mode of the pyridine rings is observed near 1020 cm−1, a frequency characteristic of pyridinium ions or coordinated pyridine, providing further evidence for adsorption through the nitrogen atoms. Silver catalyzed photooxidation, which can lead to the appearance of artifacts in SERS spectra, particularly of polymers, can be reduced by overcoating SERS samples with thin films of polymers such as poly(methyl methacrylate) that have low Raman scattering cross sections.
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