Surface-enhanced Raman Scattering of 4-Aminobenzenethiol Sandwiched between Silver Nanoparticles and Gold Micro-Powders

초록

The surface-enhanced Raman scattering (SERS) activity of micrometer-sized gold (mu Au) powders is far weaker than that of micrometer-sized silver (mu Ag) powders. The Raman peaks of organics assembled on mu Au 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 b(2)-type bands of 4-ABT are found to be enhanced more than the a(1)-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/mu Au), associated with the chemical enhancement mechanism in SERS.

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