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Field Emission from Carbon Systems

Published online by Cambridge University Press:  14 March 2011

John Robertson
John Robertson*
Affiliation:
Engineering Dept, Cambridge University, Cambridge CB2 1PZ, UK, jr@eng.cam.ac.uk
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Abstract

Electron field emission from diamond, diamond-like carbon, carbon nanotubes and nanostructured carbon is compared. It is found that in all practical cases that emission occurs from regions of positive electron affinity with a barrier of ∼5 eV and with considerable field enhancement. The field enhancement in nanotubes arises from their geometry. In diamond, the field enhancement occurs by depletion of grain boundary states. In diamond-like carbon we propose that it occurs by the presence of sp2-rich channels formed by the soft conditioning process.

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