Affiliation:
1. Department of Chemistry Seoul National University Seoul 151‐742 Korea
2. Department of Chemistry Soongsil University Seoul 156‐743 Korea
Abstract
The surface‐enhanced Raman scattering (SERS) activity of micrometer‐sized gold (μAu) powders is far weaker than that of micrometer‐sized silver (μAg) powders. The Raman peaks of organics assembled on μAu powders can, however, be enhanced dramatically by depositing Ag nanoparticles thereon to form the so‐called sandwich structures. This is demonstrated in this work by using 4‐aminobenzenthiol (4‐ABT) as the prototype organic. Besides, the b2‐type bands of 4‐ABT are found to be enhanced more than the a1‐type band, and this is presumed to be a result of the favorable Ag‐to‐Au charge transfer configuration of the sandwich structure (Ag/4‐ABT/μAu), associated with the chemical enhancement mechanism in SERS.