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

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• 作者：Yoong Ahm Kim ; Hiroyuki Muramatsu ; Takuya Hayashi ; Morinobu Endo
• 刊名：Carbon
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：50
• 期：12
• 页码：4588-4595
• 全文大小：1679 K

文摘

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 ¡ãC, 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.