Abstract
A facile and simple route has been proposed for the fabrication of Au–Ag composite micro/nanostructures by using double-pass porous alumina (DPA) template-assisted vacuum thermal evaporation technology. The resulting cascade structure of periodic 100 nm Au nano-islands @ 200 nm Ag-frustum arrays contains numerous ultra-small nanogaps can be used as an effective Surface-enhanced Raman Scattering (SERS)-active substrate for the detection of crystal violet (CV) molecules, which exhibit a high enhancement factor of 2.67 × 107 and a low relative standard deviation (RSD) value of less than 10%. The liner sensitivity of our SERS substrate is also demonstrated, suggesting that the as-prepared substrates are promising for quantitative chemical sensing.
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