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[Physical Chemistry Chemical Physics] Magnetoresistive Polyaniline-Silicon Carbide Metacomposites: Plasma Frequency Determination and High Magnetic Field Sensitivity
來源:郭占虎 (Zhanhu Guo)教授個(gè)人網(wǎng)站 發(fā)布日期:2016-09-10
作者:Magnetoresistive Polyaniline-Silicon Carbide Metacomposites: Plasma Frequency Determination and High
關(guān)鍵字:GMR, conductive polymers, SiC
論文來源:期刊
具體來源:Physical Chemistry Chemical Physics, 18, 19536-19543 (2016)
發(fā)表時(shí)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.

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