Related Experiment Video
Updated: Nov 15, 2025
10:59
Author Spotlight: Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
Published on: May 12, 2023
3.2K
Effective Electrochemical Modulation of SERS Intensity Assisted by Core-Shell Nanoparticles
Jing Guo1, Xingxu Yan2,3, Mingjie Xu3
1Department of Physics, Florida International University, 11200 SW 8th Street, Miami, Florida 33199, United States.
Analytical Chemistry
|March 2, 2021
Summary
Researchers developed a new method to tune surface-enhanced Raman scattering (SERS) intensity using electrochemical control of gold-silver core-shell nanoparticles. This technique allows reversible modulation of SERS signals for nonelectroactive molecules.
Area of Science:
- Plasmonics and Nanotechnology
- Surface Chemistry
- Electrochemistry
- Spectroscopy
Background:
- Surface-enhanced Raman scattering (SERS) is a powerful technique for sensitive molecular detection.
- Controlling SERS intensity, especially for nonelectroactive molecules, remains a challenge.
- Plasmonic nanojunctions offer potential for enhanced spectroscopic signals.
Purpose of the Study:
- To develop an effective and reversible electrochemical method for tuning SERS intensity.
- To investigate the modulation of SERS for nonelectroactive molecules using plasmonic molecular nanojunctions.
- To explore the role of electrochemical potential in controlling electromagnetic and chemical enhancement.
Main Methods:
- Fabrication of gold-silver core-shell nanoparticles on a gold nanoelectrode (Au@Ag NPs on AuNE) via in situ electrochemical silver deposition.
- Monitoring of nanoparticle formation and SERS signals through electrochemical current and spectroscopic measurements.
- Electrochemical transformation of the silver shell from metallic to insulating silver chloride (AgCl) to tune SERS intensity.
- Finite-difference time-domain (FDTD) simulations to confirm electrode potential-induced electromagnetic enhancement (EME) tuning.
Main Results:
- Successful in situ formation and monitoring of Au@Ag nanoparticle on nanoelectrode (NPoNE) structures.
- Achieved effective and reversible tuning of SERS intensity by electrochemically converting the silver shell to AgCl.
- Demonstrated that electrode potential modulates both EME and chemical enhancement, including specific Ag-molecule interaction bands.
- FDTD simulations validated the electrode potential's influence on EME in the NPoNE structure.
Conclusions:
- Electrochemical control provides an effective and reversible method for tuning SERS intensity of nonelectroactive molecules.
- The transformation of the silver shell's chemical composition is key to modulating SERS signals.
- This approach allows precise control over both electromagnetic and chemical enhancement mechanisms in plasmonic nanojunctions.
