多种形态Au／Pd核-壳纳米粒子的制备与表征  

Synthesis and Characterization of Core-Shell Au/Pd Nanocomposites with Multiple Shapes

作　　者：李敏[1] 张娴[1] 付晓峰[1] 周张凯[1] 喻学锋[1] 

机构地区：[1]武汉大学物理科学与技术学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2008年第3期287-290,共4页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金(10534030)资助项目

摘　　要：在反相微乳液十六烷基三甲基溴化铵(CTAB)中用单步法合成Au纳米棒和Au纳米球形颗粒作种子,再通过抗坏血酸还原Pd盐的方法制备了多种形态的Au/Pd核-壳结构纳米粒子.通过透射电子显微镜(TEM)、紫外-可见-近红外(UV-vis-NIR)分光光度计对Au/Pd复合粒子的形貌和光学吸收特性进行了表征.结果表明,通过调控Au核的形态,以Au纳米棒和Au纳米球形颗粒作种子,可分别得到棒状和类球状的核-壳Au/Pd纳米粒子.棒状粒子中,Au核(纳米棒)的平均长度为31 nm,宽为7 nm,Pd壳的平均厚度为8 nm;类球状粒子中,Au核(纳米球形颗粒)的平均粒径为35 nm,Pd壳的平均厚度为9 nm.该反相微乳液法简单易行,对于制备其他核-壳纳米粒子具有借鉴意义.Core-shell Au/Pd bimetallic nanocomposites with multiple shapes were synthesized by the successive reduction method in the cetyltrimethyl ammonium bromide （CTAB） reverse microemulsion, by means of using Au nanorods and Au spherical nanoparticles as seeds. The prepared nanocomposites were characterized by transmission electron microscopy and absorption spectra, respectively. The results show that the rodlike Au/Pd nanocomposites contain rodlike Au core with mean diameter of 31 nm and width of 7 nm and Pd shell with mean thickness of 8 nm, while the near-spherical Au/Pd nanocomposites contain spherical Au core with mean diameter of 35 nm and Pd shell with mean thickness of 9 nm. This simple method can be widely used for the preparation of various Au/Pd nanocomposites, and has an important example significance of synthesis various metallic core-shell nanoparticles in the reverse microemulsion.

关 键 词：十六烷基三甲基溴化铵 Au/Pd核-壳结构 Au纳米棒 Au纳米球形颗粒 

分 类 号：O645[理学—物理化学]