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Updated: Feb 27, 2026

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment

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Tracking Nanoelectrochemistry Using Individual Plasmonic Nanocavities.

G Di Martino¹, V A Turek¹, A Lombardi¹

¹NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge , Cambridge CB3 0HE, U.K.

|July 8, 2017

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We tracked nanoelectrochemistry dynamics using plasmonic nanoparticles. Applying voltage revealed charge changes and electron shifts within molecular spacers in real time.

Area of Science:

Plasmonics and Nanotechnology
Electrochemistry
Spectroscopy

Background:

Individual plasmonic nanoparticles on a mirror serve as electrodes in an electrochemical cell.
An ultrathin molecular spacer separates gold nanoparticles from a bulk gold film.
The plasmonic hotspot reveals local charge modification and molecular spacer polarizability.

Purpose of the Study:

To study the optical response of individual plasmonic nanoparticles in real time under applied voltage.
To utilize isolated plasmonic junctions for tracking nanoelectrochemistry dynamics.
To investigate charge transfer and molecular polarizability changes at the nanoscale.

Main Methods:

Utilizing gold nanoparticles as electrodes in an electrochemical cell.

Keywords:

Electrochemistry dark field spectroscopy plasmonics self-assembled monolayer surface-enhanced Raman spectroscopy

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Employing dark-field and Raman spectroscopy on individual nanoparticles.

Applying voltage to induce electrochemical changes and observing optical responses.

Main Results:

Real-time monitoring of optical response and plasmonic hotspots.
Observation of modified charge on the gold surface and changes in molecular spacer polarizability.
Demonstrated electron shifting within gap molecules, evidenced by Raman emission enhancements and blue-shifts at negative potentials.

Conclusions:

Isolated plasmonic junctions are effective for tracking nanoelectrochemistry dynamics.
Optical properties of plasmonic nanoparticles provide insights into nanoscale electrochemical processes.
Electron transfer within molecular spacers can be precisely controlled and observed.