Abstract
Near-infrared (NIR) Fourier transform (FT) Raman spectra have been measured for a series of 4-[4‘-[[(4‘ ‘-alkyloxy)phenyl]azo]naphthyloxy] alkyltrimethylammonium compounds [CnAzoNaph(1,4)CmN+Br-] in a solid state, in a cast film on a CaF2 plate, and in dipping films on etching silver foils and for one- and three-layer Langmuir−Blodgett (LB) films of C10AzoNaph(1,4)C4N+−sodium dextran sulfate (SDS) on a CaF2 plate and etching silver foils. The one-monolayer LB film on the silver foil shows much more intense Raman signals than the 75-layer film on the CaF2 plate, showing a great surface-enhanced Raman scattering (SERS) effect for the LB film on the silver foil. Since SDS plays a role as a spacer, C10AzoNaph(1,4)C4N+ is not directly adsorbed on the silver surface. Therefore, the strong SERS effect for the LB films of C10AzoNaph(1,4)C4N+−SDS may be explained by an electromagnetic mechanism. The one-monolayer dipping film of C10AzoNaph(1,4)C4N+Br- on the silver foil shows about 10 times stronger Raman signals ...
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