Modeling of Field Emission from Nano Carbons

We report here a comparative study by computer modeling of cold cathodes made from carbon nanotubes and plate-like graphite nanocrystallites. To simulate the infinite arrays of emitters the 3D Laplace problem with periodic boundary conditions has been solved. The obtained values of electric field st...

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Published inFullerenes, nanotubes, and carbon nanostructures Vol. 16; no. 5-6; pp. 384 - 388
Main Authors Kleshch, V. I., Obraztsov, A. N., Obraztsova, E. D.
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group, LLC 01.09.2008
Subjects
Field emission
Modeling
Nano-carbon materials
Nanotubes
Screening effect
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Summary:We report here a comparative study by computer modeling of cold cathodes made from carbon nanotubes and plate-like graphite nanocrystallites. To simulate the infinite arrays of emitters the 3D Laplace problem with periodic boundary conditions has been solved. The obtained values of electric field strength were used for calculation of the emission current density in accordance with Fowler-Nordheim equation. We considered the nano-carbon film as a flat array of cylinders (nanotubes) and planes (nanoflakes) with perpendicular orientation to the substrate. We have found the dependences of field enhancement factor β and current densities on distance between emitters. As a result we have obtained the optimum distances between emitters where the emission is strongest for both types of cathodes. These results have been verified experimentally.
Bibliography:ObjectType-Article-2
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ISSN:1536-383X
1536-4046
DOI:10.1080/15363830802269356