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Silver silica gold sandwich nanoparticles were synthesized by a multistep seeded growth process and were characterized by UV-vis spectroscopy, transmission electron microscopy, and X-ray diffraction. Gold islands allow passage of light through the crevices into the silica layer, and the silver core-silica shell behaves like a mirror, thus reflecting the light incident on it. These structures facilitate light amplification due to mixing of light waves from the multiple reflections. Sandwich nanoparticles show SERS enhancement of ∼10(6). This enhancement factor is 6-fold larger in magnitude than that of similar nanoparticles without the silver core under identical experimental conditions.
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Kumari et al. (2012) studied this question.
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