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Long, Y. Z., Chen, Z., Shen, J., Zhang, Z., Zhang, L., Huang, K., Wan, M., Jin, A., Gu, C. & Duvail, J. L. (2006) Magnetoresistance studies of polymer nanotube/wire pellets and single polymer nanotubes/wires. Nanotechnology, 17 5903–5911.
Added by: Florent Boucher (2016-05-12 13:21:36) |
| Type de référence: Article DOI: 10.1088/0957-4484/17/24/001 Numéro d'identification (ISBN etc.): 0957-4484 Clé BibTeX: Long2006 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: chemical-synthesis, doped polyaniline, electrical-properties, Electronic transport, metal-insulator-transition, nanotubular polyaniline, range-hopping conduction, self-assembly method, template-synthesized polypyrrole, transport-properties Créateurs: Chen, Duvail, Gu, Huang, Jin, Long, Shen, Wan, Zhang, Zhang Collection: Nanotechnology |
Consultations : 7/440
Indice de consultation : 3% Indice de popularité : 0.75% |
| Résumé |
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Conductivity and magnetoresistance (MR) measurements on pellets of conducting polyaniline and polypyrrole nanotubes/wires are presented. A transition from small negative MR to large positive MR was measured below 60 K. The positive and negative MR has been discussed in terms of a wavefunction shrinkage effect and a quantum interference effect on hopping conduction. In addition, further studies show that the MR of single polymer nanotubes/wires is very small even at 2 K (MR {<} 5% at 10 T) compared with that of the pellets (40%-100% at 10 T), and no evident and stable negative MR is observed above 50 K. The results indicate that the MR in the bulk pellet samples made of polymer nanotubes/wires is dominated by a random network of inter-fibril contacts.
Added by: Florent Boucher |