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Effects of Hydrogen Post Treatment and Duty Factor on Carbon Nanotube Field Emission Stability

Published online by Cambridge University Press:  01 February 2011

Sigen Wang  and
Sha Chang
Sigen Wang
Affiliation:
sgwang88@yahoo.com, University of North Carolina Medical School, Division of Physics & Computing, Department of Radiation Oncology, CB 7512, 101 manning drive, Chapel Hill, NC, 27599-7512, United States, 9199661101, 9199667681
Sha Chang
Affiliation:
sha_chang@med.unc.edu, Medical School, University of North Carolina, Division of Physics & Computing, Department of Radiation Oncology, Chapel Hill, NC, 27599-7512, United States
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Abstract

Carbon nanotubes (CNTs) have been investigated as field emission electron sources for a number of applications such as x-ray source and microwave power amplifier. These applications often require that nanotubes provide a stable field emission at a high emission current. In this paper, we investigated the emission stability of CNTs as functions of hydrogen post-treatment and duty factor. The experimental results show that the hydrogen plasma treatment and a reduced duty cycle from 100% to 35% can noticeably improve the emission stability of CNTs at a high current value of 4 mA. Our study also shows that emission induced anode heating at high duty factor and high emission current level degrades vacuum level and thus the emission stability of CNTs.

Keywords

nanostructurefield emissionC
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 963: Symposium Q – Nanowires and Carbon Nanotubes – Science and Applications , 2006 , 0963-Q20-50
Copyright
Copyright © Materials Research Society 2007

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References

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