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We investigated the vacuum potential barriers of various graphene edges. It is found that the exchange-correlation potential correction is significant to the edge structures with electronegativity higher than carbon. The correction leads to the local work function decreased by more than 1 eV for the O terminated edge.
The standard Fowler-Nordheim theory has been widely used and achieved great success in description of field emission (FE) experiments for over 70 years. In this paper, we present the field emission models for carbon nanotubes, wide-band-gap nanowires, and metallic nanosheets, emphasizing the deviations against the Fowler-Nordheim theory and some aspects that have not been incorporated in the standard...
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