金@银核壳纳米粒子的制备和形貌的精确控制及其表面增强拉曼光谱性能

摘要

用种子生长法制备了金@银核壳结构的纳米粒子.在制备过程中通过控制氯金酸的浓度和硝酸银的体积,得到了不同粒径的金核和不同厚度的银壳构成的核壳纳米粒子.从而得到了具有不同SERS性能的金@银核壳纳米粒子.选取具有最佳SERS性能的金@银核壳纳米粒子实现了对罗丹明6G的微量检测.%Au@Ag core-shell nanoparticles were prepared by seed-mediated growth method.The plasmon resonance properties of the core-shell nanoparticles are highly dependent on the size and shape of the core and thickness of the shell,which could be simply adjusted by varying the concentration of HAuCl4 and the volume of AgNO3.The prepared core-shell nanoparticles exhibit excellent SERS performance as substrate to detect rhodamine 6G (R6G).In addition,the precise control of core-shell morphologies (core size and shape,the thickness of the shell) is of significant importance as it strongly determines the overall SERS performance in micro chemical detection.