核-壳结构双金属纳米颗粒的表面增强拉曼散射的理论研究
Theoretical study of surface enhanced Raman scattering from core-shell bimetallic nanoparticle
陈李清 1殷一丁1
作者信息
- 1. 苏州大学物理科学与技术学院,江苏苏州215006
- 折叠
摘要
在准静态极限下,首先通过第一性原理推导带壳纳米颗粒的多重极化率,然后运用GN模型研究Ag-Au核-壳结构双金属纳米颗粒的表面增强拉曼散射.研究结果表明,随着Au壳层厚度的增加,短波长处SPR峰发生红移现象,强度减小,而长波长处的SPR峰红移的过程中伴随着强度的增加.
Abstract
In this paper, we present a first-principles approach to the study of the multipolar moments induced by the coated bimetallic particles in the quasi-static limit. Based on the semiclassi-cal Gersten-Nitzan model, we take one step forward to investigate the the enhancement radio ( R) from bimetallic interface in Ag-Au core-shell structure nanoshell. Numerical results show that the longer wavelength peak red shifts slightly and gets intense, while the shorter wavelength peak red shifts nonlinearly and decreases in intensity with increasing the Au shell thickness.
关键词
双金属纳米颗粒/核-壳结构/表面增强拉曼散射/GN模型Key words
bimetallic nanoparticles/core-shell/SERS/GN model引用本文复制引用
出版年
2012
NETL
NSTL
维普
万方数据