物理化学学报2017，Vol.33Issue(3)：458-463,6.DOI:10.3866/PKU.WHXB201701041
用原位液体池透射电镜技术表征金属钯在球形金纳米颗粒表面的异质沉积
Characterization of Heterostructural Palladium Deposition on Spherical Gold Nanoparticles by In situ Liquid Cell Transmission Electron Microscopy
摘要
Abstract
We report an in situ liquid cell scanning transmission electron microscopy (STEM) study of the heterogeneous deposition of palladium (Pd) on spherical gold (Au) nanoparticles in solution.The dynamic processes observed here revealed different behaviors of Pd deposition on Au nanoparticles.Under irradiation by an energetic electron beam,Pd was reduced and selectively deposited on Au nanoparticles through the island deposition mode.The deposition processes were accompanied with structural relaxation and surface migration of the Pd islands,and the size of the Au-Pd composite particles showed oscillatory growth behavior.In contrast,the Pd coverage on Au increased monotonically.In addition,we also captured the formation of Pd clusters through homogeneous nucleation and growth,and the subsequent coalescence of Pd clusters with islands on the Au-Pd heterostructures.The associated heterogeneous deposition mechanisms were proposed and quantitatively analyzed.The shapes and structures of the Au-Pd composite particles were characterized by highresolution transmission electron microscopy (HRTEM),which revealed the deposited Pd on the Au spherical nanoparticles was polycrystalline and contained several Pd crystallites with random orientations.The results presented here will serve as an important reference to understand heterogeneous growth in liquid solutions.关键词
原位液体池透射电镜/贵金属纳米晶/异质沉积/结构弛豫/表面迁移Key words
In situ liquid cell TEM/Noble metal nanocrystal/Heterogeneous deposition/Structure relaxation/Surface migration分类
化学化工引用本文复制引用
周晓琴,张辉,张泽,陈新,金传洪..用原位液体池透射电镜技术表征金属钯在球形金纳米颗粒表面的异质沉积[J].物理化学学报,2017,33(3):458-463,6.基金项目
The project was supported by the Shanghai Leading Academic Discipline Project,China (B502),Shanghai Key Laboratory Project,China (08DZ2230500),Shanghai Committee of Science and Technology Support Project,China (11nm0507000),State Key Laboratory of Functional Materials for Informatics Open Project,China (SKL201306) and National Natural Science Foundation of China (51222202).上海市重点学科项目(B502),上海市重点实验室项目(08DZ2230500),上海市科学技术委员会项目(11nm0507000),信息功能材料国家重点实验室开放课题(SKL201306)及国家自然科学基金(51222202)资助 （B502）
