Journal
ACS NANO
Volume 4, Issue 3, Pages 1299-1304Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn901648q
Keywords
boron nitride; HRTEM; nanomaterials; BN; aberration-corrected; 2D crystal
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Funding
- Brasenose College, University of Oxford
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Here, we present a simple method for preparing thin few-layer sheets of hexagonal BN with micrometer-sized dimensions using chemical exfoliation in the solvent 1,2-dichloroethane. The atomic structure of both few-layer and monolayer BN sheets is directly imaged using aberration-corrected high-resolution transmission electron microscopy. Electron beam induced sputtering effects are examined in real time. The removal of layers of BN by electron beam irradiation leads to the exposure of a step edge between a monolayer and bilayer region. We use HRTEM imaging combined with image simulations to show that BN bilayers can have AB stacking and are not limited to just AA stacking.
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