Plasmonic response and SERS modulation in electrochemical applied potentials

G. Di Martino, V. A. Turek, Christos Tserkezis, A. Lombardi, A. Kuhn, J. J. Baumberg

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    Abstract

    We study the optical response of individual nm-wide plasmonic nanocavities using a nanoparticle-on-mirror design utilised as an electrode in an electrochemical cell. In this geometry Au nanoparticles are separated from a bulk Au film by an ultrathin molecular spacer, giving intense and stable Raman amplification of 100 molecules. Modulation of the plasmonic spectra and the SERS response is observed with applied voltage under a variety of electrolytes. Different scenarios are discussed to untangle the various mechanisms that can be involved in the electronic interaction between NPs and electrode surfaces.
    Original languageEnglish
    JournalFaraday Discussions
    Volume205
    Pages (from-to)537-545
    Number of pages9
    ISSN1359-6640
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Electrochemistry
    • Plasmonics
    • Self-assembl ed monolayer
    • Dark field spectroscopy

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