金纳米粒子的电化学合成及光谱表征  

Electrochemical Synthesis and Spectroscopic Characterization of Gold Nanoparticles

作　　者：沈理明[1] 姚建林[1] 顾仁敖[1] 

机构地区：[1]苏州大学化学化工学院,江苏苏州215006

出　　处：《光谱学与光谱分析》2005年第12期1998-2001,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金(20373046)资助项目

摘　　要：采用电化学方法合成各种形状的金纳米粒子,生成的金纳米粒子形貌与施加电流有关,通过匀速 递增电流电解的方法,可制备得到哑铃形,球形以及棒状金纳米粒子,采用恒电流电解方法主要获得球形及 哑铃形纳米粒子。利用透射电镜、紫外-可见光谱及拉曼光谱对金纳米粒子进行相关表征。紫外-可见光谱研 究发现金纳米棒出现位于近红外区间的吸收峰(985 mn),由此推测棒的长径比约为6。以结晶紫为探针分 子,研究了金纳米粒子的表面增强拉曼光谱(SERS)效应,并分析得出其平躺的吸附模式。根据形貌表征的 结果推断了纳米粒子的生长机理。Two electrochemical methods were used to synthesize Au nanoparticles（AuNPs） with different shapes depending on the applied current. The dumbbell, spheroid and rod-like AuNPs were synthesized by increasing the current with a certain increment, while spheroid and dumbbell AuNPs were obtained by applying constant current. The AuNPs were characterized by TEM, UV-Vis spectrum and surface enhanced Raman spectra （SERS）. One absorption band located at near-IR region was observed on the AuNPs, indicating the existence of gold nanorods with the aspect ratio of about 6. The SERS effect from the AuNPs surface was studied by using crystal violet as probe molecules, which adsorbed on AuNPs surface with flat orientation. Meanwhile, the forming mechanism of AuNPs involving crystallization and growth was deduced based on the TEM results.

关 键 词：电化学合成 金纳米粒子 紫外-可见光谱 表面增强拉曼光谱 

分 类 号：O657.3[理学—分析化学]