An unconventional bonding: The presence of interlayer BH⋅⋅⋅HN dihydrogen bonds in hydrogenated bilayer BN nanosheets reduces the intrinsic large band gap of the chair-type BN conformation owing to interlayer charge transfer. In contrast, the insulating properties of the thermodynamically more stable stirrup-type bilayer BN can be engineered by applying an electric field. These results illuminate a new pathway for band gap engineering of 2D BN nanomaterials.
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