Formation of two-dimensional transition metal oxide nanosheets with nanoparticles as intermediates

被引:200
作者
Yang, Juan [1 ,2 ,3 ]
Zeng, Zhiyuan [1 ]
Kang, Jun [1 ]
Betzler, Sophia [1 ]
Czarnik, Cory [4 ]
Zhang, Xiaowei [1 ]
Ophuss, Colin [5 ]
Yu, Chang [2 ]
Bustillo, Karen [5 ]
Pan, Ming [4 ]
Qiu, Jieshan [2 ,6 ]
Wang, Lin-Wang [1 ]
Zheng, Haimei [1 ,7 ]
机构
[1] Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA
[2] Dalian Univ Technol, Liaoning Key Lab Energy Mat & Chem Engn, Sch Chem Engn, State Key Lab Fine Chem, Dalian, Peoples R China
[3] Xi An Jiao Tong Univ, Sch Chem Engn & Technol, Xian, Shaanxi, Peoples R China
[4] Gatan Inc, Pleasanton, CA USA
[5] Lawrence Berkeley Natl Lab, Natl Ctr Electron Microscopy, Mol Foundry, Berkeley, CA USA
[6] Beijing Univ Chem Technol, Coll Chem Engn, State Key Lab Chem Resource Engn, Beijing, Peoples R China
[7] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA
基金
中国博士后科学基金;
关键词
GROWTH; INTERCALATION; CDSE; NANOCRYSTALS; EXFOLIATION; HYDROXIDE; GRAPHENE; FACETS; CO;
D O I
10.1038/s41563-019-0415-3
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Two-dimensional (2D) materials have attracted significant interest because of their large surface-to-volume ratios and electron confinement. Compared to common 2D materials such as graphene or metal hydroxides, with their intrinsic layered atomic structures, the formation mechanisms of 2D metal oxides with a rocksalt structure are not well understood. Here, we report the formation process for 2D cobalt oxide and cobalt nickel oxide nanosheets, after analysis by in situ liquid-phase transmission electron microscopy. Our observations reveal that three-dimensional (3D) nanoparticles are initially formed from the molecular precursor solution and then transform into 2D nanosheets. Ab initio calculations show that a small nanocrystal is dominated by positive edge energy, but when it grows to a certain size, the negative surface energy becomes dominant, driving the transformation of the 3D nanocrystal into a 2D structure. Uncovering these growth pathways, including the 3D-to-2D transition, provides opportunities for future material design and synthesis in solution.
引用
收藏
页码:970 / +
页数:10
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