Abstract
In this work, the authors developed a method to promote the SERS activities of gold nanoparticles by deposition of thin silver shell on their surfaces. Spherical gold nanoparticles were used as the model, and a chemical reduction process was carried out to deposition silver shells on the surface of gold nanoparticles (in the form of Au@Ag). The shell thickness can be adjusted by tuning the molar ratio of MAg/MAu, and the optimized the SERS activities by using rhodamine 6G as the probing molecules. The relationship between SERS activity of Au@Ag and shell thickness was studied.
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