Gradient SERS Substrates with Multiple Resonances for Analyte Screening: Fabrication and SERS Applications.

ABSTRACT: Surface-enhanced Raman spectroscopy (SERS) provides a strong enhancement to an inherently weak Raman signal, which strongly depends on the material, design, and fabrication of the substrate. Here, we present a facile method of fabricating a non-uniform SERS substrate based on an annealed thin gold (Au) film that offers multiple resonances and gap sizes within the same sample. It is not only chemically stable, but also shows reproducible trends in terms of geometry and plasmonic response. Scanning electron microscopy (SEM) reveals particle-like and island-like morphology with different gap sizes at different lateral positions of the substrate. Extinction spectra show that the plasmonic resonance of the nanoparticles/metal islands can be continuously tuned across the substrate. We observed t

SUBMITTER: Mukherjee A 

PROVIDER: S-EPMC9414786 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature