Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (08): 825-828.doi: 10.3866/PKU.WHXB20050801

• Communication •     Next Articles

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

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