SYNTHESIS AND CHARACTERIZATION OF NANO METALS WITH CORE-SHELL STRUCTURE

作     者：Ru-ShiLiu Hau-MingChen Shu-FenHu 

作者机构：DepartmentofChemistryTaiwanUniversityTaipei106China NanoDeviceLaboratoriesHsinchu300China 

出 版 物：《China Particuology》 (中国颗粒学报)

年 卷 期：2004年第2卷第4期

页      面：160-163页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

主　　题：nanoparticle bimetallic gold core-shell 

摘      要：Using Aucore-Ptshell as an example, the synthesis and characterization of nano metals with core-shell structure is demonstrated in a systematic study on the amount-dependent morphology change in a series of Au-Pt bimetallic nanoparticles synthesized using chemical reduction. While the amount of Au precursor is kept constant throughout the whole series of compounds to obtain a fixed Au core size (7.5 nm), the Au/Pt ratio is varied from 1/1 to 1/4 in order to synthesize Pt shell layers of different thickness. We observed a remarkable shift of surface plasmon band to around 410 nm. With the aid of high resolution transmission electron microscope (HRTEM) and energy-dispersive spectrometer (EDS), the composition of the shell layer is found to be a Pt-enriched Au-Pt alloy. As the amount of Pt increases, string-like Pt clusters form on the surface of the nanoparticles. The average diameter of these Pt clusters is about 2 nm. This special structure may possess unique catalytic properties.