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Issue 37, 2014
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Electrochemically prepared nanoporous gold as a SERS substrate with high enhancement

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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.

Graphical abstract: Electrochemically prepared nanoporous gold as a SERS substrate with high enhancement

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Publication details

The article was received on 05 Mar 2014, accepted on 15 Apr 2014 and first published on 16 Apr 2014


Article type: Paper
DOI: 10.1039/C4RA01909A
Author version available: Download Author version (PDF)
Citation: RSC Adv., 2014,4, 19502-19506
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    Electrochemically prepared nanoporous gold as a SERS substrate with high enhancement

    C. Fang, J. G. Shapter, N. H. Voelcker and A. V. Ellis, RSC Adv., 2014, 4, 19502
    DOI: 10.1039/C4RA01909A

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