Interpretation of Enhancement Factor in Nonplanar Field Emitters

Smith, R C, Forrest, R D, Carey, JD, Hsu, W K and Silva, S R (2005) Interpretation of Enhancement Factor in Nonplanar Field Emitters Applied Physics Letters, 87 (1). ISSN 00036951

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Abstract

A comparison of the field emission properties of exposed nanotubes lying on a tipped carbon nanorope, with the emission properties from a sharpened iron tip of similar dimensions is performed. By varying the electrode separation it is observed that the threshold field for emission for both structures decreases as the electrode separation initially increases; however, for sufficiently large electrode separations, the threshold field is observed to reach an asymptotic value. Our results show that the field enhancement factor is fundamentally associated with the electrode separation, and depending on the experimental conditions in order to obtain a true value for electric field a set of alternative definitions for enhancement factors is required. We further confirm our experimental synopsis by simulation of the local electrostatic field which gives results similar to those obtained experimentally.

Item Type:	Article
Additional Information:	Published in Applied Physics Letters, Vol. 87, Iss. 1. Copyright 2005 American Institute of Physics.
Divisions:	Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Nano-Electronics Centre
Depositing User:	Mr Adam Field
Date Deposited:	27 May 2010 14:06
Last Modified:	23 Sep 2013 18:26
URI:	http://epubs.surrey.ac.uk/id/eprint/153

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