材料科学
石墨烯
氧化物
氧化钴
钴
纳米晶
纳米颗粒
透射电子显微镜
过渡金属
镍
化学工程
纳米技术
纳米结构
金属
催化作用
化学物理
化学
冶金
工程类
生物化学
作者
Juan Yang,Zhiyuan Zeng,Jun Kang,Sophia B. Betzler,Cory Czarnik,Xiaowei Zhang,Colin Ophus,Chang Yu,Karen C. Bustillo,Ming Pan,Jieshan Qiu,Lin‐Wang Wang,Haimei Zheng
出处
期刊:Nature Materials
[Springer Nature]
日期:2019-07-08
卷期号:18 (9): 970-976
被引量:172
标识
DOI:10.1038/s41563-019-0415-3
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. Liquid phase transmission electron microscopy reveals the growth pathway of 2D cobalt oxide and cobalt nickel oxide, in which 3D nanoparticles are formed first and then spread and transform into 2D nanosheets.
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