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《Chinese Journal of Luminescence》 2017-09
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Preparation and Characterization of Au@Ag Nanoparticles with Different Thickness of Ag Shell and Their Effects on Surface-enhanced Raman Scattering Detection

LI Pan;NIE Yong-hui;TENG Yuan-jie;LIU Wen-han;State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology,College of Chemical Engineering,Zhejiang University of Technology;  
Au@Ag core-shell bimetallic nanoparticles were prepared by chemical reduction method and successfully applied to surface-enhanced Raman scattering( SERS) analysis. The thickness of the coated Ag shell is regulated by changing the Ag/Au molar ratios in the preparation solution. The morphology of the Au@Ag nanoparticles were characterized by TEM and further confirmed by UVVis. TEM spectra show that Au @Ag nanoparticles have obvious core-shell structure,and the Ag shell layer becomes thicker with the increasing of Ag/Au molar ratio. UV-Vis spectra show that Au@Ag nanoparticles exhibit two plasmon resonance absorption peaks assigned to Au and Ag plasmonic absorption. When Ag/Au molar ratio increases,the Au core resonance is blue-shifted and the Ag shell resonance is red-shifted. The enhanced effects of Au@Ag nanoparticles with different Ag/Aumolar ratios in SERS were investigated by using amitraz as a probe. It is found that the SERS intensity of amitraz is enhanced firstly and then becomes weaker with the increasing of Ag/Au molar ratios,The optimum SERS signal appeares when the Ag/Au molar ratio is 6∶5 and the thickness of Ag shell is 6 nm. Moreover,the SERS effects of Au@Ag,Ag and Au nanparticles were further compared by using p-mercaptoaniline( 4-ATP),crystal violet( CV) and amitraz as analytes. The results show that the SERS effect of Au@Ag nanoparticles is obviously stronger than that of pure Au or Ag nanoparticles.
【Fund】: 浙江省公益性技术应用研究(分析测试)计划项目(2015C37068);; 浙江省自然科学基金(LQ17B050002)资助项目~~
【CateGory Index】: O657.37;TB383.1
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