Electrical resistivity measurements of bulk samples of carbon nanotubes show that the resistivity behaviour of nanotubes is comparable to that of graphite. Thermopower behaviour of nanotubes is similar to that of certain pyrolytic graphites. Tunneling conductance measurements on isolated tubes however show the existence of a conductance gap which increases with the inverse diameter of the tube.
Bindu Sadanadan, Thomas Kouyou Savage, Sandip Bhattacharya, Terry M. Tritt, Alan M. Cassell, M. Meyyappan, Z. R. Dai, Zhong Lin Wang, Ragaiy Zidan, Apparao M. Rao
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