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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

182 Scopus Citations
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Author(s)

  • Juan Yang
  • Jun Kang
  • Sophia Betzler
  • Cory Czarnik
  • Xiaowei Zhang
  • Colin Ophus
  • Chang Yu
  • Karen Bustillo
  • Ming Pan
  • Jieshan Qiu
  • Lin-Wang Wang
  • Haimei Zheng

Detail(s)

Original languageEnglish
Pages (from-to)970-976
Journal / PublicationNature Materials
Volume18
Issue number9
Online published8 Jul 2019
Publication statusPublished - Sept 2019
Externally publishedYes

Abstract

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.

Citation Format(s)

Formation of two-dimensional transition metal oxide nanosheets with nanoparticles as intermediates. / Yang, Juan; Zeng, Zhiyuan; Kang, Jun et al.
In: Nature Materials, Vol. 18, No. 9, 09.2019, p. 970-976.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review