Plasmon-Tuned Particles for the Amplification of Surface-Enhanced Raman Scattering from Analytes
Document Type
Article
Date of Original Version
11-22-2022
Abstract
Inelastic scattering from molecules because of vibrational modes produces unique Raman shifts, allowing these analytes to be detected with high specificity. Because Raman scattering is weak, surface-enhanced Raman scattering (SERS) has been used as a label-free technique for the detection of a variety of analytes at low concentrations. Using simple solution-based colloidal processing techniques, we have fabricated gold-coated carbon-black nanoparticles that show enhanced Raman activity. By varying the fabrication conditions, we create particles of different surface morphologies, allowing control over the peak wavelength for localized surface plasmon resonance (LSPR). By matching the LSPR wavelength to the incident laser wavelength, we get the highest signal from two model analytes, 4-nitrobenzenethiol (4-NBT) and Congo Red (CR). Our straightforward room-temperature-solution-based approach for making tunable SERS-active particles expands the range of incident radiation wavelengths that can be used for the detection of analytes using Raman scattering.
Publication Title, e.g., Journal
Langmuir
Volume
38
Issue
46
Citation/Publisher Attribution
De Oliveira, Tania T.S., Akram Abbasi, Irene Andreu, and Arijit Bose. "Plasmon-Tuned Particles for the Amplification of Surface-Enhanced Raman Scattering from Analytes." Langmuir 38, 46 (2022). doi: 10.1021/acs.langmuir.2c02451.