Preparation of AgcoreAushell Composite Bimetallic Nanoparticles and Its Surface-enhanced Raman Spectroscopy

Abstract

Abstract: Ag_coreAu_shell bimetallic nanoparticles in the size range of 50—70 nm were prepared by reduction of AuCl^-₄ in the presence of prepared Ag nanoparticles.The composition of Ag_100-xAu-x nanoparticles was varied from x=0 to x=30.The obtained nanoparticles were characterized by UV-Vis and TEM.Moreover,the activity of these nanoparticles in surface enhanced Raman spectroscopy(SERS) was checked by using p-aminothiophenol(PATP) as an adsorbate probe.It was found that the SERS signal intensity is dependent upon the n(Ag):n(Au) of these core-shell nanoparticles,as the Au fractions increased,the activity was enhanced first and then weakened,with the maximum intensity ten times stronger than Ag nanoparticles.

Key words: Ag nanoparticles, Ag_coreAu_shell bimetallic nanoparticles, Surface enhanced Raman spectroscopy

CLC Number:

O641

TrendMD:

CUI Yan, GU Ren-Ao. Preparation of Ag_coreAu_shell Composite Bimetallic Nanoparticles and Its Surface-enhanced Raman Spectroscopy[J]. Chem. J. Chinese Universities, 2005, 26(11): 2090.

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Preparation of Ag_coreAu_shell Composite Bimetallic Nanoparticles and Its Surface-enhanced Raman Spectroscopy

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