Structure of chemically derived mono- and few-atomic-layer boron nitride sheets

Han, Wei-Qiang; Lijun Wu; Yimei Zhu; Watanabe, Kenji; Taniguchi, Takashi
December 2008
Applied Physics Letters;12/1/2008, Vol. 93 Issue 22, p223103
Academic Journal
We prepared mono- and few-layer hexagonal boron nitride sheets by a chemical-solution-derived method starting from single-crystalline hexagonal boron nitride. Using high-resolution transmission electron microscopy and electron-energy-loss spectrometry, we characterized the microstructure, composition, and near-edge fine structure of the boron nitride sheets. We conclude that the fringe contrast in the edge and the moiré patterns are feasible criteria for determining the number of layers and their stacking orientation in the sheets. These criteria are also useful for other mono- and few-layer materials, such as graphene sheets.


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