Abstract Submitted to the ; NANOTUBE'05 Conference:

Multi walled carbon nanotubes (MWNTs) have been successfully produced by large-scale production system based on CVD method using Fe catalyst [1,2]. The diameters are in the range of several 10 nm or less and have provided different mechanical as well as electronic properties than those of conventional carbons. The commercially available NT's have been applied and contributing to lithium ion battery technology, sporting goods, NT based carbon composite for advanced audio speaker cones. It is also expected to be applied as a micro-catheter (inner diameter 0.43mm, outer diameter 0.53mm) made by resin/high-purity NT composite with enhanced mechanical properties (easier to handle) and extremely reduced thrombogenicity [3].
Based on the present CCVD process, controllable growth of double-walled carbon nanotubes (DWNTs) has been established, because it is expected that DWNTs are expected to have striking new electronic and mechanical properties, which is also very promising for specified applications. Here, we fabricate a paper-like material that consists of hexagonally packed bundles of clean, coaxial carbon nanotubes whose double walls vary little in diameter [1,2,4]. Also demonstrated are the coalescence of DWNTs [5], and a novel structure consisting of flattened tubules containing two SWNTs (bicable) [5].
It is envisaged that carbon nanotubes will take an important place in the development of emerging technologies in near future.
The author would like to thank Prof. M.S.Dresselhaus, Prof. M.Terrones, Prof. H.W.Kroto and Drs. T.Hayashi, Y.A.Kim for their helpful discussion and collaboration.

References
(1) A. Oberlin, M. Endo, T. Koyama. J. Cryst. Growth 32, 335 (1976).
(2) M. Endo. Chem. Tech. 568 (1988).
(3) M. Endo, S. Koyama, Y. Matsuda, T. Hayashi, and Y. A. Kim, Nano Letters 5, 101 (2005).
(4) M. Endo, H. Muramatsu, T. Hayashi, Y. A. Kim, M. Terrones, M. S. Dresselhaus, Nature 433, 476 (2005).
(5) M. Endo, T. Hayashi, H. Muramatsu, Y. A. Kim, H. Terrones, M. Terrones, and M. S. Dresselhaus, Nano Letters 4, 1451 (2004).

 

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