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Plasmonic response and SERS modulation in electrochemical applied potentials

Published version
Peer-reviewed

Type

Article

Change log

Authors

Di Martino, Giuliana  ORCID logo  https://orcid.org/0000-0001-5766-8384
Turek, VA 
Tserkezis, C 
Lombardi, A 
Kuhn, A 

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 an 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.

Description

Keywords

0306 Physical Chemistry (incl. Structural), Nanotechnology, Bioengineering

Journal Title

Faraday Discussions

Conference Name

Journal ISSN

1359-6640
1364-5498

Volume Title

Publisher

Royal Society of Chemistry
Sponsorship
European Research Council (320503)
Engineering and Physical Sciences Research Council (EP/L027151/1)
Engineering and Physical Sciences Research Council (EP/G060649/1)
Engineering and Physical Sciences Research Council (EP/G037221/1)
We acknowledge financial support from EPSRC grant EP/G060649/1, EP/L027151/1, EP/G037221/1, EPSRC NanoDTC, and ERC grant LINASS 320503. C. T. was supported by funding from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme (FP7/2007–2013) under REA grant agreement number 609405 (COFUNDPostdocDTU).