Hot-filament assisted fabrication of carbon-nanotube electron emitters

Y. Tzeng, C. Liu, Z. Chen

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

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 vapour 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.

Original languageEnglish
Pages (from-to)R751-R757
JournalMaterials Research Society Symposium - Proceedings
Volume621
DOIs
Publication statusPublished - 2000
EventElectron-Emissive Materials, Vacuum Microelectronics and Flat-Panel Displays - San Francisco, CA, United States
Duration: 2000 Apr 252000 Apr 27

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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