Abstract

Surface-enhanced resonance Raman scattering (SERRS) is shown to be a unique tool to perform selective analytical spectroscopy of a specific layer in a bilayer sample without apparent interference from adjacent material. The spatial spectroscopic tuning was achieved on Langmuir-Blodgett monolayers of two different molecules with electronic absorption in the visible. Since the surface Raman electromagnetic enhancement extends well beyond the first adsorbed monolayer, it is possible for the SERRS of upper layers to be much stronger than the surface-enhanced Raman scattering (SERS) signal from the first monolayer deposited onto a Ag surface. The SERS active surface was of Ag-coated Sn spheres that have been shown to be good enhancing surfaces in a wide spectral region encompassing that of the Ag and Au island films.

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