Related Experiment Video
Updated: Jul 30, 2025
10:43
Author Spotlight: Single-Molecule Surface-Enhanced Raman Scattering Measurements Enabled by Plasmonic DNA Origami Nanoantennas
Published on: July 21, 2023
3.4K
Insights into Plasmon-Induced Dimerization of Rhodanine-A Surface-Enhanced Raman Scattering Study
Naveen Kumar1, Nandita Maiti2,3, Susy Thomas4
1Infrared Laser Spectroscopy Section, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
The Journal of Physical Chemistry. A
|May 15, 2023
Summary
Plasmon-mediated chemical reactions drive rhodanine (Rd) dimerization on silver and gold nanoparticles. This transformation, triggered by hot electrons, is influenced by metal type and laser excitation wavelength.
Area of Science:
- Plasmonics
- Surface Chemistry
- Spectroscopy
Background:
- Plasmon-mediated chemical reactions (PMCRs) are gaining attention.
- Hot carrier generation influences PMCRs based on metal type and excitation wavelength.
Purpose of the Study:
- Investigate rhodanine (Rd) adsorption and transformation on silver and gold nanoparticles (AgNP and AuNP).
- Explore the role of plasmon-generated hot electrons in Rd dimerization.
- Analyze the influence of excitation wavelength on the reaction.
Main Methods:
- Surface-enhanced Raman scattering (SERS) spectroscopy.
- Utilized 514.5 nm and 632.8 nm laser excitations.
- Studied rhodanine adsorbed on AgNP and AuNP.
Main Results:
- Identified a prominent Raman band at 1566 cm⁻¹ attributed to the rhodanine dimer, not tautomers.
- Demonstrated rhodanine dimerization on metal surfaces, triggered by indirect hot electron transfer.
- Observed wavelength-dependent dimerization efficiency on AgNP, with 514.5 nm being more effective.
Conclusions:
- Rhodanine dimerization on AgNP and AuNP is facilitated by plasmon-induced hot electron transfer.
- The excitation wavelength significantly impacts the efficiency of rhodanine dimerization.
- The study elucidates the mechanism of PMCRs involving heterocyclic compounds.
