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50~70 nm的Ag核Au壳复合纳米粒子. 通过改变AuCl-4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.
AgcoreAushcll bimetallic nanoparticles in the size range of 50-70 nm were prepared by reduction of AuCl4^- in the presence of prepared Ag nanoparticles. The composition of Ag100-xAux 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, and then weakened, with the maximum intensity as the Au fractions increased, the activity was enhanced first ten times stronger than Ag nanoparticles.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第11期2090-2092,共3页
Chemical Journal of Chinese Universities
基金
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