Abstract
In this paper Ag nanocaps arrays were fabricated with a seed-mediated growth method by depositing Ag films on top of self-assembly close-packed monolayer of SiO2 nanoparticles. Their surface morphologies and optical properties were characterized using TEM, SEM and UV-Vis spectroscopy. Malachite green (MG) was chosen as analyte, the Surface-enhanced Raman Scattering (SERS) spectra of MG adsorbed on Ag nanocaps arrays were investigated. The enhancement factor was estimated to be as large as 4.5×109. These results revealed that these Ag nanostructures are promising for SERS applications in trace measurement and analysis of biological molecules.
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