Abstract
Gold core silver shell nanoparticles with different molar ratios of gold and silver were prepared by chemical reduction with microwave heating method. Uv-vis absorption spectrometer and transmission electron microscope (TEM) were used to detect their absorption and surface topography. The results show that core-shell nanoparticles had controllable size and uniform distribution. With Rhodamine 6G (R6G) as detection molecules, gold core silver shell sol with a molar ratio of 1:10 had the best surface-enhanced Raman scattering (SERS) effect. And we detected 10<sup>-17</sup> mol/l and 10<sup>-9</sup>mol/l R6G solution respectively after they were self-assembled on silica substrates and optical fiber endface.
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