(PCCP) Magnetoresistive Polyaniline-Silicon Carbide Metacomposites: Plasma Frequency Determination and High Magnetic Field Sensitivity
作者：H. Gu, J. Guo, M. A Khan, D. P. Young, T. D. Shen, S. Wei and Z. Guo
關鍵字：Magnetoresistive, Polyaniline-Silicon Carbide Metacomposites
論文來源：期刊
具體來源：Physical Chemistry Chemical Physics
發表時間：2016年
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.