Electrochemically prepared nanoporous gold as a SERS substrate with high enhancement

Cheng Fang, Joseph Shapter, Nicholas Voelcker, Amanda Ellis

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    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.

    Original languageEnglish
    Pages (from-to)19502-19506
    Number of pages5
    JournalRSC Advances
    Volume4
    Issue number37
    DOIs
    Publication statusPublished - 2014

    Fingerprint Dive into the research topics of 'Electrochemically prepared nanoporous gold as a SERS substrate with high enhancement'. Together they form a unique fingerprint.

  • Cite this