Journal
APPLIED PHYSICS LETTERS
Volume 76, Issue 18, Pages 2627-2629Publisher
AMER INST PHYSICS
DOI: 10.1063/1.126430
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Electron field emission from amorphous carbon is found to depend on the clustering of the sp(2) phase. The size of the sp(2) phase is varied by thermal annealing and it dominates the effect of other parameters, such as chemical composition, surface termination, sp(3) content, or conductivity. The optimum size of the sp(2) phase is determined by Raman spectroscopy and is of the order of 1 nm. The field emission originates from the sp(2) regions and is facilitated by the large field enhancement from more conductive sp(2) clusters in an insulating sp(3) matrix. (C) 2000 American Institute of Physics. [S0003-6951(00)04418-1].
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