高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (11): 2090.

• 研究论文 • 上一篇    下一篇

Ag_核Au_壳金属复合纳米粒子的制备及表面增强拉曼光谱研究

崔颜, 顾仁敖   

  1. 苏州大学化学系, 苏州215006
  • 收稿日期:2004-10-28 出版日期:2005-11-10 发布日期:2005-11-10
  • 基金资助:

    国家自然科学基金(批准号:20273045,20373046);厦门大学固体表面物理化学国家重点实验室开放课题资助

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

CUI Yan, GU Ren-Ao   

  1. Department of Chemistry,Suzhou University,Suzhou 215006,China
  • Received:2004-10-28 Online:2005-11-10 Published:2005-11-10

摘要: 在已制备好的Ag纳米粒子表面,通过化学还原的方法沉积生长Au包裹层,制备了粒子尺寸为50-70nm的Ag核Au壳复合纳米粒子.通过改变AuCl4-量,使Ag100-xAux中Au的含量由x=0变为x=30.用UV-Vis吸收光谱和透射电子显微镜(TEM)对该结构纳米粒子进行了表征,并以对巯基苯胺(PATP)为探针分子进行表面增强拉曼光谱(SERS)研究.表面拉曼光谱表明,该结构的纳米粒子具有比Ag更强的SERS活性,随着Au:Ag比例的逐渐增加,其活性呈现先增大后减小的趋势,其最大增强约为Ag纳米粒子的10倍.

关键词: Ag纳米粒子, AgAu金属复合纳米粒子, 表面增强拉曼光谱

Abstract: AgcoreAushell 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 Ag100-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, AgcoreAushell bimetallic nanoparticles, Surface enhanced Raman spectroscopy

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