Catalytic metal-free formation of multi-walled carbon nanotubes in atmospheric arc discharge

Metallic-impurity-free, nano-sized, short multi-walled carbon nanotubes (MWCNTs) in the form of a tape have been synthesized using stabilized arc discharge under atmospheric conditions. The long, thin tape consisted of crystalline MWCNTs exhibiting indiscernibly blurred interior lattice images and a...

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Bibliographic Details
Published in:	Carbon (New York) 2012-10, Vol.50 (12), p.4588-4595
Main Authors:	Kim, Yoong Ahm, Muramatsu, Hiroyuki, Hayashi, Takuya, Endo, Morinobu
Format:	Article
Language:	eng
Subjects:	Adsorbents Arc discharges Atmospherics Carbon Catalysis Chemistry Clusters Colloidal state and disperse state Cross-disciplinary physics: materials science rheology Elongation Exact sciences and technology Fullerenes and related materials diamonds, graphite General and physical chemistry Materials science Multi wall carbon nanotubes Nanostructure Physical and chemical studies. Granulometry. Electrokinetic phenomena Physics Specific materials Surface physical chemistry Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Tubes
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Summary:	Metallic-impurity-free, nano-sized, short multi-walled carbon nanotubes (MWCNTs) in the form of a tape have been synthesized using stabilized arc discharge under atmospheric conditions. The long, thin tape consisted of crystalline MWCNTs exhibiting indiscernibly blurred interior lattice images and a narrow, hollow core, as well as small and large nanoparticles. The disordered interior regions of the tubes were enlarged into hollow cores by thermal treatment at 2000°C, suggesting that the elongated tubes crystallize via a super-cooling process. The proposed macroscopic model for the growth process of the tubes in the arc resembles the fiber formation of a recently reported electrospinning process; thermally activated carbon ion and vapor create viscous carbon clusters, and the built-up charge in the clusters leads to the elongation into tubules.
ISSN:	0008-6223 1873-3891