Abstract
We report surface-enhanced Raman scattering (SERS) from Ag nanoparticles decorated onthin carbon nanowalls (CNWs) grown by microwave plasma chemical vapor deposition. TheAg morphology is controlled by exposing the CNWs to oxygen plasma and through theelectrodeposition process by varying the number of deposition cycles. The SERS substratesare capable of detecting low concentrations of rhodamine 6G and bovine serum albumin,showing much higher Raman enhancement than ordinary planar HOPG with Agdecoration. The major factors contributing to this behavior include: high density ofAg nanoparticles, large surface area, high surface roughness, and the underlyingpresence of vertically oriented CNWs. The relatively simple procedure of substratepreparation and nanoparticle decoration suggests that this is a promising approach forfabricating ultrasensitive SERS substrates for biological and chemical detection at thesingle-molecule level, while also enabling the study of fundamental SERS phenomena.
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