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Modelling of electron transfer from a carbon nanotube cap into the vacuum under high extraction fields

Filip, LD, Smith, RC, Carey, JD, Silva, SRP and Nicolaescu, D (2007) Modelling of electron transfer from a carbon nanotube cap into the vacuum under high extraction fields Technical Digest of the 20th International Vacuum Nanoelectronics Conference, IVNC 07. 48 - 49.

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Abstract

In the present work, we consider a system of a grounded CNT of length L and radius r0 (the emitter) facing a spherical anode of radius Ra(Ra>>r0). The anode is placed at some distance away from the emitter's tip. The CNT is modelled as a two-dimensional (2D) manifold where electrons behave as quasi-free and independent particle. The electrons are bound on the CNT surface by a one-dimensional (1D) potential well, due to the restriction imposed by the cylindrical symmetry. In order to have a full description of the electron behaviour in the whole system, a potential energy in the vacuum region needs also to be defined. To this purpose, the CNT cap is simplified as a grounded conducting sphere of radius r0 facing the anode on the same symmetry axis. As the emitter-anode distance, d and the anode radius, Ra are much greater than r0, the electric field in vacuum may be computed using the method of electrostatic images.

Item Type: Article
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Nano-Electronics Centre
Depositing User: Melanie Hughes
Date Deposited: 21 Oct 2010 11:24
Last Modified: 28 Nov 2013 14:52
URI: http://epubs.surrey.ac.uk/id/eprint/2540

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