title: Magnetoresistive polyaniline-silicon carbide metacomposites: plasma frequency determination and high magnetic field sensitivity.
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 × 10(4) to 1.53 × 10(5) 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.
authors.affiliation: Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai, 200092, China. hongbogu2014@tongji.edu.cn.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Gu
authors.affiliation: Integrated Composites Lab (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37966, USA. zguo10@utk.edu.
authors.forename: Jiang
authors.initials: J
authors.lastname: Guo
authors.affiliation: Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA.
authors.forename: Mojammel Alam
authors.initials: MA
authors.lastname: Khan
authors.affiliation: Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA.
authors.forename: David P
authors.initials: DP
authors.lastname: Young
authors.affiliation: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Hebei 066004, China.
authors.forename: T D
authors.initials: TD
authors.lastname: Shen
authors.affiliation: Department of Chemistry and Biochemistry, Lamar University, Beaumont, TX 77710, USA.
authors.forename: Suying
authors.initials: S
authors.lastname: Wei
authors.affiliation: Integrated Composites Lab (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37966, USA. zguo10@utk.edu.
authors.forename: Zhanhu
authors.initials: Z
authors.lastname: Guo