Field emission mechanisms of graphitic nanostructures

Abstract

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.

arXiv comment5 pages, 5 figures

References in corpus (2)

• Electronic and Magnetic Properties of Nanographite Ribbons
• Empirical potential study of phonon transport in graphitic ribbon

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• First Principles Calculation of Field Emission from Carbon Nanotubes With Nitrogen and Boron Doping
• First Principles Calculation of Field Emission from Nanostructures using Time-Dependent Density Functional Theory: a Simplified Approach