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The enhanced fluorescence of praseodymium ions (Pr3+) owing to resonant plasma oscillation on the surface of Ag/Si nanostructure was investigated. When Ag/Si nanomaterials were added, the fluorescence peaks were markedly enhanced. A typical 12- to 40-fold enhancement at 604 nm and 18- to 193-fold enhancement at 640 nm could be achieved over a range of concentration from 0.01 to 0.05 M praseodymium ions, which had larger enhancement factor than that caused by unsupported silver nanoparticles. These results might be explained by the local field overlap originated from the closed and fixed silver nanoparticles on silicon nanowires.
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Zhuo et al. (2010) studied this question.
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