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Field emission from carbon nanotube fibers in varying anode-cathode gap with the consideration of contact resistance.

Authors :
Peng Zhang
Fairchild, S. B.
Back, T. C.
Yi Luo
Source :
AIP Advances. 2017, Vol. 7 Issue 12, p125203-1-125203-6. 6p. 3 Graphs.
Publication Year :
2017

Abstract

This paper studies field emission (FE) from a single carbon nanotube (CNT) fiber with different anode-cathode (AK) gap distances. It is found that the field enhancement factor depends strongly on the finite AK gap distance, due to the combination of geometrical effects and possible fiber morphology change. The geometrical effects of AK gap distance on the field enhancement factor are confirmed using COMSOL simulations. The slope drop in the Fowler-Northeim (FN) plot of the FE data in the high voltage is related to the electrical contact resistance between the CNT fiber and the substrate. It is found that even a small series resistance to the field emitter (<30% of the emission gap impedance) can strongly modify the FE characteristics in the high voltage regime, inducing a strong deviation from the linear FN plot. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
21583226
Volume :
7
Issue :
12
Database :
Academic Search Index
Journal :
AIP Advances
Publication Type :
Academic Journal
Accession number :
127115639
Full Text :
https://doi.org/10.1063/1.5008995