不同Pt壳厚度Au_(core)@Pt_(shell)纳米粒子SERS效应  

The SERS Effect of Au_(core)@Pt_(shell) Nanoparticles with Different Pt Shell Thicknesses

作　　者：钟艳[1] 颜亮亮[1] 饶贵仕[1] 邓小聪[1] 温飞鹏[1] 徐金龙[1] 钟起玲[1] 

机构地区：[1]江西师范大学化学化工学院,江西南昌330022

出　　处：《电化学》2010年第3期300-304,共5页Journal of Electrochemistry

基　　金：国家自然科学基金(20663002);厦门大学固体表面物理化学国家重点实验室基金(200511);江西省自然科学基金(0620025)资助

摘　　要：以Au粒子(55nm)为核,抗坏血酸为还原剂,将不同量的Pt沉积在Au核上,制得可控壳层厚度(0.3～6nm)的Pt包Au纳米粒子(Aucore@Ptshell).用紫外-可见吸收光谱、扫描电镜(SEM)、透射电镜(TEM)和电化学循环伏安法等观测Aucore@Ptshell纳米粒子的表面形貌、结构和性能.另以SCN-为探针,考察了Pt壳厚度对Aucore@Ptshell纳米粒子SERS信号的影响.结果表明,SCN-离子的SERS信号强度随Pt壳厚度的增加呈指数衰减,当Pt壳厚度为1.4nm时,Aucore@Ptshel纳米粒子表现出铂良好的电化学性能,又具有较强的SERS活性.By using Au nanoparticles with a diameter of 55 nm as the core and ascorbic acid as the reductant, Aucore@ Ptshell nanoparticles of controllable Pt shell thickness（ 0. 3 ～ 6 nm） were synthesized by controlling the concentration of [PtCl6]2 - ions. The ultraviolet-visible absorption spectrometry,scanning electron microscope （ SEM） ,transmission electron microscope （ TEM） ,high resolution transmission electron microscope （ HRTEM） , and electrochemical cyclic voltammetry were employed to determine surface morphology and structure of Aucore@ Ptshell. With SCN - ion as a probe,the effect of the thickness of the Pt shell on the SERS signals of Aucore@ Ptshell nanoparticles was investigated. It was found that the intensities of SERS signals decreased exponentially with the increase of Pt shell thickness. The result revealed that at a shell thickness of 1. 4 nm,the core-shell nanoparticles present the chemical property of the Pt shell and having a large SERS activity.

关 键 词：铂包金纳米粒子 可控制备 SERS活性 

分 类 号：O646[理学—物理化学]