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Related Experiment Video

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Plasmonic response and SERS modulation in electrochemical applied potentials.

G Di Martino1, V A Turek, C Tserkezis

  • 1NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge, CB3 0HE, UK. gd392@cam.ac.uk jjb12@cam.ac.uk.

Faraday Discussions
|September 8, 2017
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Summary
This summary is machine-generated.

We investigated plasmonic nanocavities as electrodes, observing voltage-controlled Raman amplification for molecule detection. This study explores electronic interactions in nanoparticle-on-mirror systems for enhanced sensing applications.

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Area of Science:

  • Nanophotonics and Plasmonics
  • Electrochemistry
  • Surface-Enhanced Raman Spectroscopy (SERS)

Background:

  • Plasmonic nanocavities offer unique optical properties for sensing.
  • Electrochemical control provides a dynamic way to tune nanostructure behavior.
  • Surface-Enhanced Raman Spectroscopy (SERS) enables highly sensitive molecular detection.

Purpose of the Study:

  • To investigate the optical response of plasmonic nanocavities acting as electrodes.
  • To explore voltage-induced modulation of plasmonic spectra and SERS signals.
  • To understand the electronic interactions between nanoparticles and electrode surfaces.

Main Methods:

  • Utilized a nanoparticle-on-mirror (NPoM) design as an electrochemical cell electrode.
  • Employed gold (Au) nanoparticles separated from a bulk Au film by a molecular spacer.
  • Applied voltage in various electrolytes to modulate optical and SERS responses.

Main Results:

  • Achieved intense and stable SERS amplification for approximately 100 molecules.
  • Observed significant modulation of plasmonic spectra with applied voltage.
  • Demonstrated voltage-dependent changes in SERS response.

Conclusions:

  • The NPoM design functions effectively as an electrochemically tunable plasmonic sensor.
  • Applied voltage influences the electronic interactions at the nanoparticle-electrode interface.
  • This work provides insights into mechanisms for electrochemically controlled plasmonic and SERS phenomena.