Long, Yunze and Chen, Zhaojia and Shen, Jiaoyan and Zhang, Zhiming and Zhang, Lijuan and Huang, Kun and Wan, Meixiang and Jin, Aizi and Gu, Changzhi and Duvail, Jean Luc (2006) Magnetoresistance studies of polymer nanotube/wire pellets and single polymer nanotubes/wires. Nanotechnology, 17 (24). pp. 5903-5911. ISSN 09574484
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Official URL: http://www.iop.org/EJ/abstract/0957-4484/17/24/001
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.
|Subjects:||Material Science > Functional and hybrid materials|
Physical Science > Nanomagnetics
|Deposited By:||M T V|
|Deposited On:||22 Dec 2008 16:00|
|Last Modified:||19 Feb 2009 18:17|
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