Three-dimensional arrays of Au nanoparticles in an anodic porous alumina matrix were applied to a substrate for the measurement of surface-enhanced Raman scattering (SERS). The dependences of the SERS intensity of pyridine on the number of Au nanoparticle layers, and the gap size between nanoparticles were examined. The SERS intensity was in a good linear relationship with the number of layers of nanoparticles. The intensity also strongly depended on the gap between nanoparticles. This dependence is thought to originate from the enhancement of electric field of incident light with the decrease in the gap between nanoparticles.
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Kondo et al. (2009) studied this question.
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