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Hot-Filament Assisted Fabrication of Carbon-Nanotube Electron Emitters

Published online by Cambridge University Press:  14 March 2011

Yonhua Tzeng ,
Chao Liu  and
Zheng Chen
Yonhua Tzeng
Affiliation:
Alabama Microelectronics Science and Technology Center, Department of Electrical and Computer Engineering, Auburn University, AL 36849
Chao Liu
Affiliation:
Alabama Microelectronics Science and Technology Center, Department of Electrical and Computer Engineering, Auburn University, AL 36849
Zheng Chen
Affiliation:
Space Power Institute, Auburn University, AL 36849
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Abstract

A hot-filament CVD reactor was used for the deposition of carbon nanotubes on substrates. Hydrocarbon or oxyhydrocarbon mixtures were used as the carbon source. Hot filaments at temperatures exceeding 2000C provided a means of dissociating the vapor or gas feedstock, heating the substrate, and allowing gas species to react in the gas phase as well as on the surface of the substrate leading to the deposition of desired carbon coatings. A high vacuum chamber was used to characterize the electron emission properties of these carbon nanotube coatings using a one-millimeter diameter tungsten rod with a hemispherical tip as the anode while the carbon nanotube coatings served as the cathode. The current-voltage characteristics of the carbon nanotube coatings were measured and used for calculating the electric field at which electron emission turned on as well as calculating the field enhancement factor of the carbon nanotubes. Field emission of electrons from carbon nanotubes starting from an electric field of as low as 1-2 volts per micrometer was achieved.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 621: Symposia Q/R – Electron-Emissive Materials, Vacuum Microelectronics… , 2000 , R7.5.1
Copyright
Copyright © Materials Research Society 2000

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References

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