Magnetoresistance studies of polymer nanotube/wire pellets and single polymer nanotubes/wires

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 shrink...

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Bibliographic Details
Published in:Nanotechnology 2006-12, Vol.17 (24), p.5903-5911
Main Authors: Long, Yunze, Chen, Zhaojia, Shen, Jiaoyan, Zhang, Zhiming, Zhang, Lijuan, Huang, Kun, Wan, Meixiang, Jin, Aizi, Gu, Changzhi, Duvail, Jean Luc
Format: Article
Language:English
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Summary: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.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/17/24/001