Multiwalled carbon nanotubes mass-produced by dc arc discharge in He–H2 gas mixture |
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Authors: | T Suzuki Y Guo S Inoue X Zhao M Ohkohchi Y Ando |
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Institution: | (1) 21st Century COE Program “Nano Factory”, Department of Materials Science and Engineering, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku Nagoya, 468-8502, Japan;(2) School of Information Science and Engineering, Shenyang University of Technology, Tiexiqu, Shenyang, 110023, China |
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Abstract: | Uniform cathode deposits (longer than 15 mm), containing multiwalled carbon nanotubes (MWNTs) inside, were produced by dc arc discharge evaporation with a computer-controlled feeder of a pure-carbon electrode without a metal catalyst in a He–H2 gas mixture. The purification of MWNTs was carried out to remove amorphous carbon and carbon nanoparticles. High-resolution transmission electron microscopy observations and Raman scattering studies show that the MWNTs possess a high crystallinity and a mean outermost diameter of ∼
∼10 nm. It has been confirmed that the current density in the electron field emission from a purified MWNT mat can reach 77.92 mA/cm2, indicating that the purified MWNTs are a promising candidate electron source in a super high-luminance light-source tube or a miniature X-ray source. |
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Keywords: | carbon nanotubes arc discharge scanning electron microscopy transmission electron microscopy Raman spectroscopy electric properties field emission |
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