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

• Yarong Su,
• Yuanzhen Shi,
• Ping Wang,
• Jinglei Du,
• Markus B. Raschke and
• Lin Pang

Beilstein J. Nanotechnol. 2019, 10, 549–556, doi:10.3762/bjnano.10.56

• intensity dependence of the chemical enhancement and allows for a more systematic design of SERS substrates with desired properties. Keywords: benzenethiol; chemical enhancement; physical enhancement; quantification; surface-enhanced Raman scattering (SERS); Introduction Surface-enhanced Raman scattering

• observe no such coupling in our experimental results, as the chemical enhancement remains almost constant within a large variation of physical enhancement. Physical and chemical enhancement both contribute to the changes in the spectra. The static chemical contribution is due to an increase of the

• different vibrational resonances in benzenethiol. Irrespective of the absolute values, they are independent of the substrate type and independent of the electromagnetic intensity enhancement in the range from 1 to 106. The observed independence of the chemical enhancement from the physical enhancement