Conduction mechanisms in single-walled carbon nanotubes

The transport properties of single-walled carbon nanotubes (SWNTs) were examined to investigate their conduction mechanisms. By measuring the temperature dependence of the resistance, it was clarified that the conduction mechanism in SWNT mats can be changed from the non-metallic to the coexistence of metallic and non-metallic modes as the thickness of the mats changed. This change is attributable to the quality and the quantity of metallic nanotubes.