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

Gu, Hongbo; Guo, Jiang; Khan, Mojammel A.; Young, David P.; Shen, Tongde; Wei, Suying; Guo, Zhanhu

doi:10.1039/c6cp02694j

Cited by 32 publications

(12 citation statements)

References 66 publications

(116 reference statements)

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“…Accordingly, these materials are also called intrinsic metamaterials or a M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 new concept "metacomposites". [5][6][7][8] In recent years, intrinsic metamaterials with tunable negative permittivity begin to gain extensive research attention due to the potential application, such as plasmons biosensing [9], microwave funneling [10], and electromagnetic shield [11], sensors [12][13][14], negative permittivity materials can also be used in left-handed materials when combined with negative permeability materials, etc. [15][16][17] However, the recent investigations of negative permittivity mainly focus on how to explain and realize negative permittivity.…”

Section: Introductionmentioning

confidence: 99%

Negative permittivity adjusted by SiO2-coated metallic particles in percolative composites

Xie

Sun

Wang

et al. 2017

Journal of Alloys and Compounds

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Negative permittivity has taken off as a research topic recent years in percolative composites. However, how to effectively tune the negative permittivity is still a challenge remained unsolved. Herein, the percolative composites with SiO 2-coated metallic particles homogeneously dispersed in epoxy resin were prepared using blending and hot-molding procedure. The negative permittivity was realized with the form of three-dimensional metallic network, and the value and frequency range of negative permittivity were precisely adjusted by the distribution of coated particles.

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Section: Introductionmentioning

confidence: 99%

Negative permittivity adjusted by SiO2-coated metallic particles in percolative composites

Xie

Sun

Wang

et al. 2017

Journal of Alloys and Compounds

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“…After introducing AgNWs to the CFS, the conductive AgNWs contributed to the connectivity of network, leading to the increase of electron concentration. Drude model was used to explore the mechanism of negative permittivity, which can be expressed as follows [31][32][33],…”

Section: Resultsmentioning

confidence: 99%

Carbon fiber skeleton/silver nanowires composites with tunable negative permittivity behavior

Qin

Sun

et al. 2021

EPJ Appl. Metamat.

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With the development of periodic metamaterials, more attention has been paid to negative permittivity behavior due to great potential applications. In this paper, silver nanowires (AgNWs) were introduced to the porous carbon fibers (CFS) by an impregnation process to prepare CFS/AgNWs composites with different content of AgNWs and the dielectric property was investigated. With the formation of conductive network, the Drude-like negative permittivity was observed in CFS/AgNWs composites. With the increase of AgNWs, the connectivity of conductive network became enhanced, the conductivity gradually increases, and the absolute value of the negative dielectric constant also increases to 8.9 × 104, which was ascribed to the enhancement of electron density of the composite material. Further investigation revealed that the inductive characteristic was responsible for the negative permittivity.

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“…The small |ɛ′| also benefit their applications in the microwave absorbers and antenna . As the frequency is larger than f p , the composites behave as an ordinary dielectric medium . The ε′ diminishes with increasing frequency due to the intensifying electric leakage.…”

Section: Resultsmentioning

confidence: 99%

Radio‐frequency negative permittivity in the graphene/silicon nitride composites prepared by spark plasma sintering

et al. 2017

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Graphene/silicon nitride (GR/Si 3 N 4 ) ceramic composites with uniformly dispersed GR sheets were prepared using spark plasma sintering. The effects of GR content on the microstructure and electrical properties of the composites were investigated in detail. With the GR content rising, the conductive GR network was formed in the composites, leading to the appearance of a percolation phenomenon, and the conductive mechanism also changed from hopping conductivity to metal-like conductivity. When the GR content reached the percolation threshold, the composites showed a negative permittivity behavior, which resulted from the low frequency plasmonic state generated by the formative conducting GR networks. The increasing GR content resulted in a higher plasma frequency and larger magnitude of negative permittivity, which was consistent with the analysis of Drude model. A relatively high dielectric loss was observed in the composites and mainly induced by the high leakage current among GR sheets. Our work is beneficial to expound the regulation mechanism of negative permittivity, and the obtained ceramic composites present some potential applications in microwave absorption, shielding and capacitors. K E Y W O R D Sdielectric materials/properties, percolation, silicon nitride, spark plasma sintering

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

Cited by 32 publications

References 66 publications

Negative permittivity adjusted by SiO2-coated metallic particles in percolative composites

Negative permittivity adjusted by SiO2-coated metallic particles in percolative composites

Carbon fiber skeleton/silver nanowires composites with tunable negative permittivity behavior

Radio‐frequency negative permittivity in the graphene/silicon nitride composites prepared by spark plasma sintering

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