Field emission mechanisms of graphitic nanostructures

Details Field emission mechanisms of graphitic nanostructures Field emission mechanisms of graphitic nanostructures

2004-10-21

arxiv.org/abs/cond-mat/0410524v1

Physics

Condensed Matter

Materials Science

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.70.245410

Field emission (FE) and the electronic-states origin of graphitic nanostructures were investigated by first-principles calculations based on time-dependent density-functional theory. We find that the FE current from graphitic ribbons changes remarkably depending on the hydrogen termination and the direction of the applied electric field. Also, the FE current from graphene sheets shows a dramatic increase around vacancy defects. We verified, through the analysis of local electronic structures and energy distributions of emitted electrons, that the dangling-bond (or $\sigma$) character is responsible for these results and governs the nature of the FE of graphitic nanostructures.

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