Electronic transport in carbon nanotube ropes and mats

We suggest that conduction in carbon nanotube ropes or mats is best understood in terms of a heterogeneous model, involving regions of metallic conduction together with hopping or tunnelling through small electrical barriers corresponding to defects of various types. Such a model gives a good accoun...

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Bibliographic Details
Published in:Synthetic metals 1999-06, Vol.103 (1), p.2547-2550
Main Authors: Kaiser, B., Park, Y.W., Kim, G.T., Choi, E.S., Düsberg, G., Roth, S.
Format: Article
Language:English
Subjects:
carbon nanotubes
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electrical properties of specific thin films
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Fullerenes and related materials
Physics
resistivity
thermopower
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Summary:We suggest that conduction in carbon nanotube ropes or mats is best understood in terms of a heterogeneous model, involving regions of metallic conduction together with hopping or tunnelling through small electrical barriers corresponding to defects of various types. Such a model gives a good account of the measured resistivity, in particular the crossover from nonmetallic to metallic sign for the resistivity temperature dependence seen in many samples, in analogy to our similar model for conducting polymers. In agreement with this model, the thermopower has been observed to be more metal-like than resistivity, but does show pronounced nonlinearities as a function of temperature. We investigate electron-phonon effects, density of states peaks, and semiconductor contributions as possible causes of these nonlinearities.
ISSN:0379-6779
1879-3290
DOI:10.1016/S0379-6779(98)00222-7