We report here on the investigations of the electrical transport property for single pure or Au-doped multi-walled carbon nanotubes and super-long (millimetric scale) carbon nanotubes, which were grown via CVD method. The results revealed that the structures of carbon nanotubes strongly dominate their electrical properties. It was found that doping can modulate the electrical transport property of carbon nanotubes, and the doping effect on the transport of the carbon nanotubes is discussed. The transport measurements on mat of pure or doped carbon nanotubes revealed that the resistance of the CVD-grown carbon nanotubes has negative temperature dependence. (C) 2001 Published by Elsevier Science Ltd. References: 27
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