一种新型的通用的SERS基底-核壳结构纳米子  

A New Versatile SERS Substrate-Core-Shell Nanoparticles

作　　者：李剑锋[1] 方萍萍[1] 盛建军[1] 鲍芳[1] 吴德印[1] 任斌[1] 田中群[1] 

机构地区：[1]厦门大学化学系固体表面物理化学国家重点实验室,厦门361005

出　　处：《光散射学报》2007年第4期358-362,共5页The Journal of Light Scattering

摘　　要：为了进一步来提高SERS基底和分子的普适性,本文采取了一种"借力"的方法,设计合成了金核过渡金属薄壳(Au@Pd,Au@Pt,Au@Ni,Au@Co)的核壳结构纳米粒子,借用底层高SERS活性的金核强的电磁场来增强过渡金属表面吸附分子的SERS信号,使得过渡金属表面的增强因子可达104-105。系统地开展了不同壳层厚度及相同壳层厚度下金核大小对SERS活性影响的研究,发现随着壳层厚的增加SERS活性迅速衰减,而且当金核为120-140 nm时可以得到最强的增强。To further improve the generality of molecules and SERS substrates, we have employed a strategy of ＂borrowing SERS activity＂ that is to coat Au nanoparticles with ultrathin film of various transition metals to form coreshell nanoparticles, such as Au@Pd, Au@ Pt, Au@Ni, Au@Co. With the aid of the long - range effect of the enormous electromagnetic enhancement created by the high SERS- active Au core underneath, the originally low surface enhancement of the transition metal can be substantially improved giving total enhancement factors up to 104 - 105. The effects of the shell thickness and the Au core size on the SERS activity were systematically investigated. The SERS of the thickness and the Au core with a size of activity decreases dramatically with the increase 120 - 140 nm gives the maximal enhancement.

关 键 词：SERS活性 核壳结构 纳米粒子 基底 过渡金属表面 通用 吸附分子 设计合成 

分 类 号：O437.3[机械工程—光学工程]