低维材料原子尺度动态结构演变  

Atomistic insights into the dynamic structural evolutions in low-dimensional materials

作　　者：郑赫[1,2,3] 曹凡[1,2,3] 胡帅帅 孟爽 李雷 刘辉辉[1,2,3] 贾双凤[1,2,3] 王建波 ZHENG He;CAO Fan;HU Shuai-shuai;MENG Shuang;LI Lei;LIU Hui-hui;JIA Shuang-feng;WANG Jian-bo(School of Physics and Technology,Wuhan University,Wuhan Hubei 430072;Center for Electron Microscopy,Wuhan University,Wuhan Hubei 430072;MOE Key Laboratory of Artificial Micro-and Nano-Structures,and Institute for Advanced Studies,Wuhan University,Wuhan Hubei 430072,China)

机构地区：[1]武汉大学物理科学与技术学院 [2]武汉大学电子显微镜中心 [3]武汉大学人工微结构教育部重点实验室和高等研究院

出　　处：《电子显微学报》2019年第5期436-444,共9页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(Nos.51871169,51671148,51271134,J1210061,11674251,51501132,51601132);湖北省自然科学基金资助项目(Nos.2016CFB446,2016CFB155);高等学校仪器设备和优质资源共享系统(No.CERS-1-26);中国博士后科学基金资助项目(No.2014T70734);中央高校基本科研业务费专项资金拔尖创新人才资助项目(No.2042019kf0190)

摘　　要：本文利用透射电子显微镜的高能电子束对低维材料在应力场、温度场或电场作用下的动态结构演变进行实时观察及表征:(1)应力场作用下Au纳米线塑性和赝弹性形变,以及CuO纳米线滞弹性行为;(2)高温条件下Fe/Fe3O4氧化还原反应以及ZnO纳米线的生长过程;(3)电场作用下CuO电极材料的Na离子嵌入与脱嵌。随后,利用高能电子束辐照对低维材料的结构进行原子尺度的调控。文章旨在揭示外场作用下低维材料微结构演变机制,为其潜在应用提供参考。Employing in-situ transmission electron microscopy,this paper provides a review of our recent findings regarding the dynamic structural evolutions of low-dimensional materials subjected to external stimuli,including:(1)plastic and pseudoelastic deformation of Au nanowires,as well as anelasticity of CuO nanowires;(2)redox reaction of Fe/Fe3O4 nanoparticles and growth of ZnO nanowires at elevated temperatures;(3)sodiation and desodiation processes of CuO electrodes.Furthermore,high-energy electron beam has been utilized to precisely tuning the structures and thus properties of low-dimensional materials.The results reveal the mechanisms of microstructural evolution under external fields,which may facilitate the potential applications.

关 键 词：低维材料 原位透射电子显微学 

分 类 号：TB303[一般工业技术—材料科学与工程]