Controlled oxidative etching of gold nanorods revealed through in-situ liquid cell electron microscopy

作     者：Wen Wang Tao Xu Tingting Bai Chao Zhu Qiubo Zhang Hongtao Zhang Hui Zhang Zhirui Guo Haimei Zheng Litao Sun 王文;徐涛;柏婷婷;朱超;张秋波;张弘韬;张辉;郭智睿;郑海梅;孙立涛

作者机构：SEU-FEI Nano-Pico CenterKey Lab of MEMS of Ministry of EducationSoutheast UniversityNanjing 210096China Materials Sciences DivisionLawrence Berkeley National LaboratoryBerkeleyCA 94720USA Department of GeriatricsThe Second Affiliated HospitalKey Laboratory for Aging&DiseaseNanjing Medical UniversityNanjing 210011China Department of Materials Science and EngineeringUniversity of CaliforniaBerkeleyCalifornia 94720USA 

基　　金：supported by the National Natural Science Foundation of China(51420105003,11327901,61601116 and 61974021) the National Science Fund for Distinguished Young Scholars(11525415) China Scholarship Council(201806090114) 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2020年第63卷第12期

页      码：2599-2605页

摘      要：Oxidative etching can be a powerful approach to modify the morphology of nanoscale materials for various *** of the etching mechanisms and morphological evolution during etching is *** the liquid cell transmission electron microscopy,we investigate the etching behavior of gold nanorods under different electron beam dose rates:caseⅠ,3.5×10^9 Gy s^-1;caseⅡ,1.5×10^10 Gy s^-1;caseⅢ,4.5×10^10 Gy s^-*** Au nanorod develops facets at the tips(caseⅠ)or adopts a transit ellipsoid shape and eventually dissolves(caseⅡ),depending on the dose *** rapid etching under an even higher dose rate(caseⅢ)may lead to the formation of Au3+ion-rich intermediates around the nanorod,which further accelerates the lateral etching and unexpectedly increases the aspect ratio of the *** quantitative analysis shows that the critical size of the nanorod,below which the etching rate increases significantly with the reduction of nanorod size,may vary subject to the degree that the system is away from *** results provide significant insights into the oxidative etching mechanisms and shed light on the rational design and synthesis of nanostructures.

主 题 词：in-situ liquid transmission electron microscope oxidative etching etching mechanism electron dose rate gold 

学科分类：07[理学] 070205[070205] 08[工学] 080501[080501] 0805[工学-能源动力学] 0702[理学-物理学类] 

核心收录：

D　O　I：10.1007/s40843-020-1338-7

馆 藏 号：203981686...