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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Acknowledgements
We thank Dr. Uemura, S. and Dr. Yotani, J. for the field emission measurement of MWNTs, and we also thank Dr. Hiramatsu, M. for allowing us the use of the Raman spectrometer.
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Suzuki, T., Guo, Y., Inoue, S. et al. Multiwalled carbon nanotubes mass-produced by dc arc discharge in He–H2 gas mixture. J Nanopart Res 8, 279–285 (2006). https://doi.org/10.1007/s11051-005-9004-2
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DOI: https://doi.org/10.1007/s11051-005-9004-2