Journal
DIAMOND AND RELATED MATERIALS
Volume 47, Issue -, Pages 40-45Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2014.05.006
Keywords
Carbon nanotubes; Field emission; Long term stability; Large current; Vacuum tubes
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Funding
- National Basic Research Program of China 973 [2013CB328803, 2010CB327705]
- National Natural Science Foundation of China [51002031, 61007036, 61101023]
- Fundamental Research Funds for the Central Universities
- CAEP THz Science and Technology Foundation [CAEPTHZ201203]
- National High Technology Research and Development Program 863 [2012AA03A302, 2013AA011004]
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For the future commercial applications of carbon nanotubes (CNTs) in high power vacuum microwave amplifiers or compact X-ray tubes, we have attempted to fabricate engrafted CNT field emitters on a metallic substrate using both screen printing and chemical vapor deposition. Cobalt nano-grains are doped in the printed CNT paste and act as the catalyst for the engrafted growth of CNTs by the cold wall chemical vapor deposition. Stable cathode current (similar to 30 mA) from a small area (similar to 1.5 mm(2)) of engrafted CNT emitters was measured in a vacuum-sealed diode tube. High current density (>1.6A/cm(2)) has also gotten in the vacuum sealed tube in which the emitters spread about 0.78 mm(2) after an aging process that lasts more than 12 h in DC mode with the water cooling of the anode. (C) 2014 Elsevier B.V. All rights reserved.
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