物理化学学报 >> 2005, Vol. 21 >> Issue (08): 825-828.doi: 10.3866/PKU.WHXB20050801

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利用壳层厚度调节核壳Au@Pd纳米粒子的SERS活性

李剑锋; 胡家文; 任斌; 田中群   

  1. 厦门大学固体表面物理化学国家重点实验室, 厦门大学化学化工学院化学系, 厦门 361005
  • 收稿日期:2005-05-13 修回日期:2005-06-14 发布日期:2005-08-15
  • 通讯作者: 田中群 E-mail:zqtian@xmu.edu.cn

Tuning the SERS Activity of Au@Pd Core-shell Nanoparticles by Controlling the Thickness of the Pd Shell

LI Jian-feng; HU Jia-wen; REN Bin; TIAN Zhong-qun   

  1. State Key Laboratory for Physical Chemistry of Solid Surface and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005
  • Received:2005-05-13 Revised:2005-06-14 Published:2005-08-15
  • Contact: TIAN Zhong-qun E-mail:zqtian@xmu.edu.cn

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摘要： 设计合成了一种尺寸可控, 且外壳上无“针孔”的核壳钯包金(Au@Pd)纳米粒子, 通过改变核的尺寸和外壳的厚度来调控其光学性质, 并用TEM、HRTEM、UV-Vis和SERS等手段对其进行了表征. 通过研究Au@Pd纳米粒子的SERS活性随Pd壳层厚度变化的规律, 发现薄壳Au@Pd纳米粒子远远优于Pd金属本身的SERS活性, 其原因主要是内层金核电磁场增强的长程效应.

关键词: Pd, Au, 核-壳纳米粒子, 表面增强拉曼散射

Abstract: Pinhole-free Au core Pd shell (Au@Pd) nanoparticles with controllable size were synthesized, and the optical properties of the nanoparticles can be tuned by varying the size of the core and the thickness of the shell. The Au@Pd nanoparticles were characterized with TEM, HRTEM, UV-Vis absorption spectroscopy and SERS. Through a systematic study of the dependence of SERS activity of Au@Pd nanoparticles on the thickness of the Pd shell, it was found that the SERS activity of the Au@Pd nanoparticles is much higher than the massive Pd electrode roughened using electrochemical method, which is owing to the long-range effect of the enhanced electromagnetic field of the Au core.

Key words: Palladium, Gold, Core-shell nanoparticles, Surface-enhanced Raman scattering