Transport property investigation of pure and Au-doped carbon nanotubes

We report here on the investigations of the electrical transport property f or single pure or Au-doped multi-walled carbon nanotubes and super-long (mi llimetric scale) carbon nanotubes, which were grown via CVD method. The res ults revealed that the structures of carbon nanotubes strongly dominate the ir electrical properties. It was found that doping can modulate the electri cal transport property of carbon nanotubes, and the doping effect on the tr ansport 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 Pu blished by Elsevier Science Ltd.