Spherical to truncated octahedral shape transformation of palladium nanocrystals driven by e-beam in aqueous solution  

作　　者：Yingying Jiang Xiao Li Xiaoming Ma Haifeng Wang Hui Zhang Zheng Liu Ze Zhang Chuanhong Jin 

机构地区：[1]State Key Laboratory of Silicon Materials,School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China [2]Department of Chemistry,Zhejiang University,Hangzhou 310027,China [3]Inorganic Functional Materials Research Institute,National Institute of Advanced Industrial Science and Technology(AIST),Nagoya 463-8560,Japan

出　　处：《Nano Research》2019年第10期2623-2627,共5页纳米研究（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.51772265,51761165024,and 61721005);the National Basic Research Program of China(No.2015CB921004);the Zhejiang Provincial Nature Science Foundation(No.D19E020002);the 111 project(No.B16042).Y.Y.J.acknowledges the support of the National Postdoctoral Program for Innovative Talents(No.BX201700208);This work made use of the resources of the Center of Electron Microscopy of Zhejiang University

摘　　要：The crystallographic shapes of nano crystals play critical roles in determi ning their physical and chemical properties.Liquid phase synthesis serves as one of the most importa nt approaches for preparing shape-controlled nano crystals,therefore,understa nding the formation mecha nisms of the thermod yn amic equilibrium structures of nano crystals in liquid soluti on is importa nt.Using in situ liquid cell tran smissi on electron microscopy(TEM),we observe for the first time the shape transformation of individual palladium nanocrystals from energy unfavored spherical shapes into equilibrium truncated octahedrons in aqueous solution.Via quantitative analysis of the shape evolution dynamics of an individual Pd nano crystal,we find that about 10%of nano crystal atoms were relocated during the shape tran sformation.The mass tran sport is attributed to the synergetic effect of electron beam irradiation and water environment.

关 键 词：equilibrium SHAPE Pd NANOCRYSTALS SHAPE transformation dynamics liquid cell transmission electron microscopy(TEM) 

分 类 号：TB3[一般工业技术—材料科学与工程]