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Magnetoresistive conductive polymer-tungsten trioxide nanocomposites with ultrahigh sensitivity at low magnetic field |
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| Authors: | Hongbo Gu Jiang Guo Huige Wei Xi Zhang Jiahua Zhu Lu Shao Yudong Huang Neel Haldolaarachchige David P. Young Suying Wei Zhanhu Guo |
| Affiliation: | 1. School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China;2. Integrated Composites Laboratory (ICL), Dan F. Smith Department of Chemical Engineering, Lamar University, Beaumont, TX 77710, USA;3. Department of Chemistry and Biochemistry, Lamar University, Beaumont, TX 77710, USA;4. Department of Chemical & Biomolecular Engineering, University of Akron, Akron, OH 44325, USA;5. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA |
| Abstract: | The effect of conductive polymer matrix including polyaniline (PANI) and polypyrrole (PPy) on the magnetoresistance (MR) behaviors in the variable range hopping (VRH) regime has been investigated in the disordered polymer nanocomposites containing tungsten trioxide (WO3) nanoparticles. These nanocomposites have demonstrated ultrahigh MR sensitivity at low magnetic field regime. The observed positive MR has been well explained by the wave-function shrinkage model. The conductive polymer matrix has shown different effects on the MR behaviors of the nanocomposites. The WO3/PANI nanocomposites have a lower localization length (a0) and density of states at the Fermi level (N(EF)), and higher average hopping distance (Rhop) and average hopping energy (W) compared with those of the WO3/PPy nanocomposites. |
| Keywords: | Non-magnetic conductive polymer nanocomposites Electron transport Magnetoresistance |
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