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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.
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页码:970 / +
页数:10
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