Atomic mechanisms of hexagonal close-packed Ni nanocrystallization revealed by in situ liquid cell transmission electron microscopy  

作　　者：Junyu Zhang Miao Li Zewen Kang Bensheng Xiao Haichen Lin Jingyu Lu Haodong Liu Xue Zhang Dong-Liang Peng Qiaobao Zhang 

机构地区：[1]Instrumental Analysis Center,Laboratory and Equipment Management Department,Huaqiao University,Xiamen 361021,China [2]Department of Materials Science and Engineering,College of Materials,Xiamen University,Xiamen 361005,China [3]College of Chemical Engineering,Huaqiao University,Xiamen 361021,China [4]Center for Materials and Interfaces,Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences,1068 Xueyuan Avenue,Shenzhen 518055,China [5]Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM),Xiamen 361005,China [6]School of Science,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China [7]Chemical Engineering,University of California San Diego,La Jolla,CA 92093,USA

出　　处：《Nano Research》2022年第7期6772-6778,共7页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22001083,52072323,and 52122211);the“Double-First Class”Foundation of Materials and Intelligent Manufacturing Discipline of Xiamen University.J.Y.L.thanks the Research Startup Fund from Harbin Institute of Technology(Shenzhen)with the project number University(No.20210028);the Shenzhen Steady Support Plan(No.GXWD20201230155427003-20200824103000001).

摘　　要：The fundamental understanding of the mechanism underlying the early stages of crystallization of hexagonal-close-packed(hcp)nanocrystals is crucial for their synthesis with desired properties,but it remains a significant challenge.Here,we report using in situ liquid cell transmission electron microscopy(TEM)to directly capture the dynamic nucleation process and track the real-time growth pathway of hcp Ni nanocrystals at the atomic scale.It is demonstrated that the growth of amorphous-phase-mediated hcp Ni nanocrystals is from the metal-rich liquid phases.In addition,the reshaped preatomic facet development of a single nanocrystal is also imaged.Theoretical calculations further identify the non-classical features of hcp Ni crystallization.These discoveries could enrich the nucleation and growth model theory and provide useful information for the rational design of synthesis pathways of hcp nanocrystals.

关 键 词：hexagonal-close-packed(hcp)nanocrystals liquid cell transmission electron microscopy(TEM) amorphous-phasemediated reshape 

分 类 号：TB332[一般工业技术—材料科学与工程]