Sers Properties Of Gold Core Silver Shell Nanoparticles Self-Assembled On Silica Substrates And Optical Fiber Endface

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(-17) mol/l and 10(-9) mol/l R6G solution respectively after they were self-assembled on silica substrates and optical fiber endface.