Metal-enhanced fluorescence (MEF) is a newly emerging phenomenon in which the near-field interactions of
fluorophores with the plasmons in metallic nanostructures can lead to substantial fluorescence enhancements. In the
present study, we have investigated the use of silver-gold nanocomposite (Ag-Au-NC) structures, prepared by the
galvanic replacement reaction of silver with gold, as plasmonic substrates for MEF. We have observed significant
enhancement in the fluorescence intensities and decrease in the fluorescence lifetimes of two commonly used dyes,
ATTO655 and Cy5, using the fabricated Ag-Au-NC substrates. Interestingly, the fluorescence enhancement depends on
the amount of residual silver present in the substrates after the galvanic replacement reaction. Our results show that the
galvanic replacement reaction is a very facile and powerful route to prepare Ag-Au-NC substrates that can be suitable
for various MEF based applications.
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