Magnetoresistive polyaniline-silicon carbide metacomposites: Plasma frequency determination and high magnetic field sensitivity
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.
Publication Source (Journal or Book title)
Physical Chemistry Chemical Physics
Gu, H., Guo, J., Khan, M., Young, D., Shen, T., Wei, S., & Guo, Z. (2016). Magnetoresistive polyaniline-silicon carbide metacomposites: Plasma frequency determination and high magnetic field sensitivity. Physical Chemistry Chemical Physics, 18 (29), 19536-19543. https://doi.org/10.1039/c6cp02694j