Electrochemically prepared nanoporous gold as a SERS substrate with high enhancement
Date
2014
Authors
Fang, C.
Shapter, J.G.
Voelcker, N.H.
Ellis, A.V.
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Journal article
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RSC Advances, 2014; 4(37):19502-19506
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Abstract
Single-molecule surface-enhanced Raman scattering (SM-SERS) utilizes localized surface plasmons in metallic nanostructures for enhanced signal detection. This work demonstrates the use of SM-SERS on an electrochemically anodized biocompatible nanoporous gold (NpAu) substrate using a bi-analyte Raman technique. It was found that the positions (so-called hot-spots) with the closest etched valley widths (w), or the smallest w/valley wall width (D) (ligaments), of the Au nanopores dominated the Raman scattering. By using an etched substrate with a w < 10 nm and a w/D < 0.2 an estimated enhancement factor of 107 for both Nile blue and Rhodamine 6G dyes was achieved. Importantly, the bi-analyte Raman technique enabled the clear confirmation of single (or few) molecule detection on the Np/Au substrates.
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Copyright 2014 The Royal Society of Chemistry