Statistical analysis of field electron emission from nanostructured carbon films

The field-emission properties of nanostructured carbon films (NSCFs), such as carbon nanotubes and carbon nanoparticles, were measured using a microtip and a large-area phosphor-screen anode. Except at small bias-voltage range, the current-versus-voltage curves measured with a large-area anode were...

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Bibliographic Details
Published in:Journal of applied physics 2006-02, Vol.99 (3)
Main Authors: Park, Kyung Ho, Lee, Soonil, Koh, Ken Ha
Format: Article
Language:English
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Summary:The field-emission properties of nanostructured carbon films (NSCFs), such as carbon nanotubes and carbon nanoparticles, were measured using a microtip and a large-area phosphor-screen anode. Except at small bias-voltage range, the current-versus-voltage curves measured with a large-area anode were fitted well to a simplified Fowler-Nordheim (FN) equation with a series-resistance effect. From the mapping of the turn-on field using a microtip anode, it was deduced that the field-enhancement factor β of NSCFs had an asymmetric distribution with a large-β tail. The asymmetric β distribution led to explanations of the slight curvature in FN plots at the low-voltage regime and of the exponential increase of emission-site densities dependent on the applied field.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2168231