Quantification and coupling of the electromagnetic and chemical contributions in surface-enhanced Raman scattering.

ABSTRACT: In surface-enhanced Raman scattering (SERS), both chemical (CE) and electromagnetic (EM) field effects contribute to its overall enhancement. However, neither the quantification of their relative contributions nor the substrate dependence of the chemical effect have been well established. Moreover, there is to date no understanding of a possible coupling between both effects. Here we demonstrate how systematically engineered silver and gold planar and nanostructured substrates, covering a wide range of field enhancements, provide a way to determine relative contributions of chemical and electromagnetic field-enhancement in SERS measurements of benzenethiol. We find a chemical enhancement of 2 to 14 for different vibrational resonances when referencing against a vibrational mode that underg

SUBMITTER: Su Y 

PROVIDER: S-EPMC6404390 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature