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Issue 29, 2016
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Magnetoresistive polyaniline–silicon carbide metacomposites: plasma frequency determination and high magnetic field sensitivity

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Abstract

The Drude model modified by Debye relaxation time was introduced to determine the plasma frequency (ωp) in the surface initiated polymerization (SIP) synthesized β-silicon carbide (β-SiC)/polyaniline (PANI) metacomposites. The calculated plasma frequency for these metacomposites with different loadings of β-SiC nanoparticles was ranging from 6.11 × 104 to 1.53 × 105 rad s−1. The relationship between the negative permittivity and plasma frequency indicates the existence of switching frequency, at which the permittivity was changed from negative to positive. More interestingly, the synthesized non-magnetic metacomposites, observed to follow the 3-dimensional (3-D) Mott variable range hopping (VRH) electrical conduction mechanism, demonstrated high positive magnetoresistance (MR) values of up to 57.48% and high MR sensitivity at low magnetic field regimes.

Graphical abstract: Magnetoresistive polyaniline–silicon carbide metacomposites: plasma frequency determination and high magnetic field sensitivity

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Publication details

The article was received on 22 Apr 2016, accepted on 21 Jun 2016 and first published on 24 Jun 2016


Article type: Communication
DOI: 10.1039/C6CP02694J
Citation: Phys. Chem. Chem. Phys., 2016,18, 19536-19543
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    Magnetoresistive polyaniline–silicon carbide metacomposites: plasma frequency determination and high magnetic field sensitivity

    H. Gu, J. Guo, M. A. Khan, D. P. Young, T. D. Shen, S. Wei and Z. Guo, Phys. Chem. Chem. Phys., 2016, 18, 19536
    DOI: 10.1039/C6CP02694J

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