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Science 14 August 1998:
Vol. 281. no. 5379, pp. 973 - 975
DOI: 10.1126/science.281.5379.973
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Reports

Coaxial Nanocable: Silicon Carbide and Silicon Oxide Sheathed with Boron Nitride and Carbon

Y. Zhang, * K. Suenaga, C. Colliex, S. Iijima

Multielement nanotubes comprising multiple phases, with diameters of a few tens of nanometers and lengths up to 50 micrometers, were successfully synthesized by means of reactive laser ablation. The experimentally determined structure consists of a beta -phase silicon carbide core, an amorphous silicon oxide intermediate layer, and graphitic outer shells made of boron nitride and carbon layers separated in the radial direction. The structure resembles a coaxial nanocable with a semiconductor-insulator-metal (or semiconductor-insulator-semiconductor) geometry and suggests applications in nanoscale electronic devices that take advantage of this self-organization mechanism for multielement nanotube formation.

Y. Zhang, Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan. K. Suenaga, Laboratoire de Physique des Solides, URA 002, Université de Paris-Sud, Bâtiment 510, 91405 Orsay, France, and Japan Science and Technology, Department of Physics, Meijo University, Nagoya 468-8502, Japan. C. Colliex, Laboratoire de Physique des Solides, URA 002, Université de Paris-Sud, Bâtiment 510, 91405 Orsay, France. S. Iijima, Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan, and Japan and Science Technology, Department of Physics, Meijo University, Nagoya 468-8502, Japan.
*   To whom correspondence should be addressed. E-mail: zhang{at}frl.cl.nec.co.jp

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