Model Calculation for the Field Enhancement Factor of Carbon Nanowall Array

Tomohiko YAMAKAMI  Masahiro YAMASHITA  Rinpei HAYASHIBE  Kiichi KAMIMURA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E94-C   No.12   pp.1867-1871
Publication Date: 2011/12/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.1867
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Organoelectronic Materials and Their Applications for Nanotechnology)
Category: 
Keyword: 
field emission,  field enhancement factor,  nanowall,  

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Summary: 
To estimate the field emission current associated with an array of carbon nanowalls (CNWs), the model of the floating rods between anode and cathode plates was proposed. An approximate formula for the enhancement factor was derived, showing that the interwall distance of the CNW array critically affects the field emission. The field enhancement factor was almost one order of magnitude less than that of vertically aligned CNTs. Considering the field emission current density, the field emission can be optimized when the interwall distance is comparable with the wall height. For same separation distance, the macroscopic field strength of the CNW array is almost one order of magnitude higher than that of vertical CNT array to obtain the emission current of 1 mA from the cathode surface of 1 cm2.