Atomic-scale observation of a two-stage oxidation process in Cu2O  

作　　者：Huihui Liu He Zheng Lei Li Huaping Sheng Shuangfeng Jia Fan Cao Xi Liu Boyun Chen Ru Xing Dongshan Zhao Jianbo Wang 

机构地区：[1]School of Physics and Technology, Center for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-structures, and Institute for Advanced Studies, Wuhan University, Wuhan 430072, China [2]Middle School Attached to Huazhong University of Science and Technology, Wuhan 430074, China [3]Shuiguohu Senior Middle School, Wuhan 430071, China [4]The Department of Physics Science and Technology, Baotou Normal College, Baotou 014030, China [5]Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, China

出　　处：《Nano Research》2017年第7期2344-2350,共7页纳米研究（英文版）

基　　金：This work was supported by the National Basic Research Program of China （No. 2011CB933300）, the National Natural Science Foundation of China （Nos. 51671148, 51271134, J1210061, 11674251, 51501132, and 51601132）, the Hubei Provincial Natural Science Foundation of China （Nos. 2016CFB446 and 2016CFB155）, the Fundamental Research Funds for the Central Universities, and the CERS-1-26 （CERS-China Equip- ment and Education Resources System）, and the China Postdoctoral Science Foundation （No. 2014T70734）, and the Open Research Fund of Science and Technology on High Strength Structural Materials Laboratory （Central South University） and the Suzhou Science and Technology project （No. SYG201619）.

摘　　要：Atomic-scale oxidation dynamics of Cu2O nanocrystallines （NCs） are directly observed by in situ high-resolution transmission electron microscopy. A two-stage oxidation process is observed： （1）The initial oxidation stage is dominated by the dislocation-mediated oxidation behavior of Cu2O NCs via solid-solid transformations, leading to the formation of a new intermediate CuOx phase. The possible crystal structure of the CuOx phase is discussed. （2） Subsequently, CuOx is transformed into CuO by layer-by-layer oxidation. These results will help in understanding the oxidation mechanisms of copper oxides and pave the way for improving their structural diversity and exploiting their potential industrial applications.Atomic-scale oxidation dynamics of Cu2O nanocrystallines （NCs） are directly observed by in situ high-resolution transmission electron microscopy. A two-stage oxidation process is observed： （1）The initial oxidation stage is dominated by the dislocation-mediated oxidation behavior of Cu2O NCs via solid-solid transformations, leading to the formation of a new intermediate CuOx phase. The possible crystal structure of the CuOx phase is discussed. （2） Subsequently, CuOx is transformed into CuO by layer-by-layer oxidation. These results will help in understanding the oxidation mechanisms of copper oxides and pave the way for improving their structural diversity and exploiting their potential industrial applications.

关 键 词：OXIDATION in situ electron microscopy CU2O intermediated phases 

分 类 号：O614.121[理学—无机化学] TQ245.12[理学—化学]