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Long, Y.-Z., Yin, Z.-H., Li, M.-M., Gu, C.-Z., Duvail, J.-L., Jin, A. & Wan, M.-X. (2009) Current-voltage characteristics of individual conducting polymer nanotubes and nanowires. Chin. Phys. B, 18 2514–2522.
Added by: Richard Baschera (2016-03-10 21:41:24) Last edited by: Richard Baschera (2016-05-24 14:17:54) |
| Type de référence: Article Numéro d'identification (ISBN etc.): 1674-1056 Clé BibTeX: Long2009b Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: carbon nanotubes, charge-transport, conducting polymers, electrical-conductivity, I-V curves, magnetic-susceptibility, nanotubes/wires, pedot nanowires, polyacetylene nanofibres, polyaniline nanotubes, polypyrrole nanotube, room-temperature, tunneling conduction Créateurs: Duvail, Gu, Jin, Li, Long, Wan, Yin Collection: Chin. Phys. B |
Consultations : 1/503
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We report the current-voltage (I-V) characteristics of individual polypyrrole nanotubes and poly(3,4-ethylenedioxythiophene) (PEDOT) nanowires in a temperature range from 300 K to 2 K. Considering the complex structures of such quasi-one-dimensional systems with an array of ordered conductive regions separated by disordered barriers, we use the extended fluctuation-induced tunneling (FIT) and thermal excitation model (Kaiser expression) to fit the temperature and electric-field dependent I-V curves. It is found that the I-V data measured at higher temperatures or higher voltages can be well fitted by the Kaiser expression. However, the low-temperature data around the zero bias clearly deviate from those obtained from this model. The deviation (or zero-bias conductance suppression) could be possibly ascribed to the occurrence of the Coulomb-gap in the density of states near the Femi level and/or the enhancement of electron-electron interaction resulting from nanosize effects, which have been revealed in the previous studies on low-temperature electronic transport in conducting polymer films, pellets and nanostructures. In addition, similar I-V characteristics and deviation are also observed in an isolated K0.27MnO2 nanowire.
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