skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Explosive field emission and plasma expansion of carbon nanotube cathodes

Abstract

High intensity electron emission cathodes based on carbon nanotube films have been successfully fabricated. An investigation of the explosive field emission properties of the carbon nanotube cathode in a double-pulse mode was presented and a high emission current density of 309 A/cm{sup 2} was obtained. The time-and-space resolution of the electron-beam flow from the cathode was investigated. The formation of the cathode plasma layer was proven and the plasma expanded at a velocity of {approx}7.8 cm/{mu}s toward the anode. The formation of cathode plasma has no preferential position and the local enhancement of electron beams is random.

Authors:
; ; ; ; ; ;  [1];  [2]
  1. State Key Laboratory for Advanced Metals and Materials, Department of Materials Physics, University of Science and Technology Beijing, 30 Xueyuan Road, Beijing 100083 (China)
  2. (China)
Publication Date:
OSTI Identifier:
20960205
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 90; Journal Issue: 15; Other Information: DOI: 10.1063/1.2722227; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; ANODES; CARBON; CATHODES; CURRENT DENSITY; ELECTRON BEAMS; ELECTRON EMISSION; ELECTRONS; FIELD EMISSION; LAYERS; NANOTUBES; PLASMA; PLASMA EXPANSION; PULSES; RANDOMNESS; THIN FILMS

Citation Formats

Liao Qingliang, Zhang Yue, Huang Yunhua, Qi Junjie, Gao Zhanjun, Xia Liansheng, Zhang Huang, and Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang 621900. Explosive field emission and plasma expansion of carbon nanotube cathodes. United States: N. p., 2007. Web. doi:10.1063/1.2722227.
Liao Qingliang, Zhang Yue, Huang Yunhua, Qi Junjie, Gao Zhanjun, Xia Liansheng, Zhang Huang, & Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang 621900. Explosive field emission and plasma expansion of carbon nanotube cathodes. United States. doi:10.1063/1.2722227.
Liao Qingliang, Zhang Yue, Huang Yunhua, Qi Junjie, Gao Zhanjun, Xia Liansheng, Zhang Huang, and Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang 621900. Mon . "Explosive field emission and plasma expansion of carbon nanotube cathodes". United States. doi:10.1063/1.2722227.
@article{osti_20960205,
title = {Explosive field emission and plasma expansion of carbon nanotube cathodes},
author = {Liao Qingliang and Zhang Yue and Huang Yunhua and Qi Junjie and Gao Zhanjun and Xia Liansheng and Zhang Huang and Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang 621900},
abstractNote = {High intensity electron emission cathodes based on carbon nanotube films have been successfully fabricated. An investigation of the explosive field emission properties of the carbon nanotube cathode in a double-pulse mode was presented and a high emission current density of 309 A/cm{sup 2} was obtained. The time-and-space resolution of the electron-beam flow from the cathode was investigated. The formation of the cathode plasma layer was proven and the plasma expanded at a velocity of {approx}7.8 cm/{mu}s toward the anode. The formation of cathode plasma has no preferential position and the local enhancement of electron beams is random.},
doi = {10.1063/1.2722227},
journal = {Applied Physics Letters},
number = 15,
volume = 90,
place = {United States},
year = {Mon Apr 09 00:00:00 EDT 2007},
month = {Mon Apr 09 00:00:00 EDT 2007}
}
  • The plasma-induced electron emission properties of large area carbon nanotube (CNT) array cathodes under different pulse electric fields were investigated. The formation and expansion of cathode plasmas were proved; in addition, the cathodes have higher emission current in the double-pulse mode than that in the single-pulse mode due to the expansion of plasma. Under the double-pulse electric field of 8.16 V/mum, the plasma's expansion velocity is about 12.33 cm/mus and the highest emission current density reached 107.72 A/cm{sup 2}. The Cerenkov radiation was used to diagnose the distribution of electron beams, and the electron beams' generating process was plasma-induced emission.
  • No abstract prepared.
  • Pulsed field emission from cold carbon-nanotube cathodes placed in a radiofrequency resonant cavity was observed. The cathodes were located on the backplate of a conventionalmore » $$1+\frac{1}{2}$$-cell resonant cavity operating at 1.3-GHz and resulted in the production of bunch train with maximum average current close to 0.7 Amp\`ere. The measured Fowler-Nordheim characteristic, transverse emittance, and pulse duration are presented and, when possible, compared to numerical simulations. The implications of our results to high-average-current electron sources are briefly discussed.« less
  • Multiwall carbon nanotubes (MW-CNT) have been synthesized from solid-phase graphite. The graphite is deposited as a thick-film paste and irradiated with a 1.2 keV flood Ar-ion beam, transforming the graphite surface to a composite of MW-CNT embedded in the graphite matrix. Micro-Raman measurements have verified that the nanotubes are metallic in nature. The technique was used to make printed field-emission cathodes. Emission from these cathodes demonstrates Fowler-Nordheim tunneling characteristics. The irradiated film emits at an extraction field of 5.0 V/{mu}m, which is less than one-sixth of the minimum extraction field of the nonirradiated graphite film, and exhibit lower noise andmore » greater emission uniformity.« less
  • We report the preparation of new nanocomposites based on a combination of bulk metallic glass and carbon nanotubes for electron field emission applications. The use of bulk metallic glass as the matrix ensures high electrical and thermal conductivity, high thermal stability, and ease of processing, whilst the well dispersed carbon nanotubes act as highly efficient electron emitters. These advantages, alongside excellent electron emission properties, make these composites one of the best reported options for electron emission applications to date.