Dual percolation behaviors of electrical and thermal conductivity in metal-ceramic composites

Sun, Kai; Zhang, Z. D.; Qian, Lei; Dang, Feng; Zhang, X. H.; Fan, Runhua

doi:10.1063/1.4941758

Cited by 56 publications

(28 citation statements)

References 33 publications

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“…5(b)). In our previous investigations [55,56], the negative permittivity was achieved in metal/ceramic composites due to the plasma oscillation of the delocalized electrons in metallic clusters, which can be explained by Drude model [12]. Moreover, the plasma-like negative permittivity was obtained in polyimide/carbon nanotube composites [57], which was ascribed to the metallic-like nature of MWCNTs.…”

Section: Accepted Manuscriptmentioning

confidence: 85%

Flexible polydimethylsiloxane/multi-walled carbon nanotubes membranous metacomposites with negative permittivity

Sun

Xie

Wang

et al. 2017

Polymer

401

145

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Section: Accepted Manuscriptmentioning

confidence: 85%

Flexible polydimethylsiloxane/multi-walled carbon nanotubes membranous metacomposites with negative permittivity

Sun

Xie

Wang

et al. 2017

Polymer

401

145

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“…With the increase of graphene content, the permittivity gradually became enhanced. When graphene content in the composites reached 14 wt%, the permittivity remarkably increased to about 200, which was ascribed to the significant enhancement of interfacial polarization 53,54. After incorporating graphene sheets into the insulating PVA matrix, amounts of electrons surrounded the interfaces between graphene and PVA, so the interfacial polarization increased and resulted in a high permittivity.…”

Section: Resultsmentioning

confidence: 99%

Hydrosoluble Graphene/Polyvinyl Alcohol Membranous Composites with Negative Permittivity Behavior

Sun

Wang

Xin

et al. 2020

Macro Materials & Eng

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In this work, a hydrosoluble matrix is used for the first time to prepare flexible membranous composites, in order to improve their environmental friendliness and simplify the processing. Modified graphene (GR) sheets are distributed in polyvinyl alcohol (PVA) solution to achieve flexible GR/PVA metacomposites. As graphene content increases, an interconnected graphene network is eventually formed among the PVA matrix, and the resulting composites present a conductor‐like behavior. Interestingly, the Drude‐like negative permittivity is obtained in the composites with 20 wt% graphene, which is ascribed to the plasma oscillation. Meanwhile, the absolute values of negative permittivity decrease by several orders of magnitude due to the moderate electron density of graphene. It is demonstrated that the negative permittivity is dependent on the inductive character. This work provides a novel and versatile approach based on water‐soluble matrices to prepare flexible membranous metacomposites, which can be applied in wearable cloaking, thin‐film capacitors, and flexible and stretchable devices.

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“…For instance, some magnetic metal particles (such as Fe, Ni, or Co) were incorporated into porous alumina matrixes using an impregnation‐reduction process, and tunable negative parameters were demonstrated in the obtained composites by tailoring their composition and microstructure . The negative parameters also were achieved in yttrium iron garnet composites with Ag or Cu particles, which were prepared by an in situ synthesis method . Meanwhile, negative permittivity behavior was observed in metal alloy/alumina ceramics containing Fe 50 Ni 50 or FeNiMo particles .…”

Section: Introductionmentioning

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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Dual percolation behaviors of electrical and thermal conductivity in metal-ceramic composites

Cited by 56 publications

References 33 publications

Flexible polydimethylsiloxane/multi-walled carbon nanotubes membranous metacomposites with negative permittivity

Flexible polydimethylsiloxane/multi-walled carbon nanotubes membranous metacomposites with negative permittivity

Hydrosoluble Graphene/Polyvinyl Alcohol Membranous Composites with Negative Permittivity Behavior

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

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