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A novel type of nano-tapered Ag/PAA (Porous Anodic Alumina) hybrid structure was conveniently fabricated by a multistep anodizing and etching pore-widening method and thermal evaporation of a Ag film. Different Ag film thickness and annealing process were introduced to investigate the Ag/PAA morphology related optical property and SERS performances. It was found that the Ag/PAA hybrid structures had...
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