Phys. Rev. Lett. 88, 127601 (2002) [4 pages]Ab Initio Study of Field Emission from Graphitic RibbonsReceived 14 September 2001; published 7 March 2002 We have performed first-principles calculations on field emission (FE) from graphitic ribbons within the time-dependent density-functional theory. An important finding is that dangling bond states localized at clean edges are major contributors to FE current. H termination makes the FE current small due to the disappearance of the dangling-bond states. FE is found not to occur from the edge state of a H-terminated zigzag ribbon even when the state is at the Fermi level. The results of the FE current from graphitic ribbons give ∼1μA for maximum of FE current from a circular edge of graphitic sheets with ∼1nm diameter of an open-ended multiwalled carbon nanotube under a high electric field of ∼1V/Å. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.127601
DOI:
10.1103/PhysRevLett.88.127601
PACS:
79.70.+q, 61.48.+c, 71.15.Mb
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