Modelling of electron transfer from a carbon nanotube cap into the vacuum under high extraction fields
Filip, LD, Smith, RC, Carev, 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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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.
|Divisions:||Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Nano-Electronics Centre|
|Deposited By:||Melanie Hughes|
|Deposited On:||21 Oct 2010 12:24|
|Last Modified:||16 Feb 2013 16:02|
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