Three-dimensional graphene network/phenolic resin composites towards tunable and weakly negative permittivity

Wu, Haikun; Yin, Rui; Qian, Lei; Zhang, Zidong

doi:10.1016/j.matdes.2016.12.068

Cited by 36 publications

(17 citation statements)

References 43 publications

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“…In our obtained composites, the formed continuous GR networks provide a mass of free electron (electron gas) and the low frequency plasmonic state, leading to the appearance of negative ε′. Similar plasma‐like negative ε′ behavior was also reported in some GR/polymer nanocomposites and metal/ceramic composites . The ε′ spectra at the low frequency (20‐200 MHz) are fitted using the Drude model:

{normalε}_{}^{'} = {normalε}_{\infty} (1 - \frac{ω_{normalP}^{2}}{{normalω}^{2} + {normalΓ}_{D}^{2}})

where ε ∞ is permittivity of high frequency, ω (ω = 2π f ) is the angular frequency of the external electrical field, ω p (ω p = 2π f p ) is the effective angular plasma frequency and Γ D is damping constant.…”

Section: Resultssupporting

confidence: 71%

“…Two‐dimensional graphene (GR) can be identified as an ideal candidate for constructing random metamaterials, due to its intrinsic plasmons, tunable electrical conductivity, high tensile strength, and excellent thermal property . The negative permittivity behavior has been reported in the GR and its polymer composites . Whereas, the scientific literature related to negative permittivity of GR/ceramic composites is rather scarce .…”

Section: Introductionmentioning

confidence: 99%

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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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{normalε}_{}^{'} = {normalε}_{\infty} (1 - \frac{ω_{normalP}^{2}}{{normalω}^{2} + {normalΓ}_{D}^{2}})

Section: Resultssupporting

confidence: 71%

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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“…Gr/phenolic resin composites have also been used as dielectric materials. Wu et al [139] prepared threedimensional Gr network/phenolic resin composite materials with adjustable and low negative dielectric constants. e results of this study showed negative dielectric constants could be controlled by controlling the Gr content.…”

Section: Applications Of Graphene/polymer Composite Materialsmentioning

confidence: 99%

A Review on the Contemporary Development of Composite Materials Comprising Graphene/Graphene Derivatives

Long

Weng

2020

Advances in Materials Science and Engineering

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As two-dimensional materials with a high specific surface area, strength, and electrical and thermal conductivity, graphene (Gr) and its derivatives have great application prospects in various fields such as structural reinforcement, energy storage, optics, and electrical and thermal conductivity. However, the current preparation method of Gr is complicated and expensive. Its preparation cost can be reduced using Gr composites that include inorganic materials or other polymers. Composite materials comprising Gr and inorganic materials are generally prepared using sinter molding, chemical reduction, or chemical deposition. Gr should be able to mitigate several of the defects resulting from inorganic materials, including their poor toughness, small specific capacity, and low photoelectric conversion rate. The mitigation of these defects should result in the expansion of the applications of Gr composites for use in capacitors, catalysts, and sensors, among other devices. Although solution blending or in situ polymerization produces a relatively good mixing effect, in general, melt blending is used in the large-scale processing of Gr composites with polymer materials. Gr can be used to partially mitigate several weaknesses of polymer materials, including their low strength, poor electrical and thermal conductivities, and poor isolation performance, and expand the applications of Gr composites for use in electrical and thermal conductive materials and functional membrane materials, among other applications. The goal of the present paper is to introduce the structural properties of Gr and a surface modification method for Gr. In addition, the preparation methods and application fields of different Gr composite materials are reviewed. Finally, the development prospects and key issues are discussed.

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“…In our previous work, GR-based conventional metacomposites with negative permittivity were designed, such as GR-phenolic resin (PR) and GR-acrylic polyurethane composites [20][21][22]. However, due to the fact that GR lacks magnetic properties, the applications of these conventional metacomposites have been limited in some fields, such as magnetic recording systems, computer memory, and magnetoresistance sensors [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Magnetic negative permittivity with dielectric resonance in random Fe3O4@graphene-phenolic resin composites

Zhang

Yin

et al. 2017

Adv Compos Hybrid Mater

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Magnetic Fe 3 O 4 @graphene-phenolic resin (FGR-PR) composites with negative permittivity were prepared by chemical coprecipitation and pressing method. Alternating current conductivity, permittivity, and permeability of the FGR-PR composites were investigated. An obvious percolation phenomenon was observed with the increase of FGR content from 84 to 91 vol%. Two types of negative permittivity attributed to the Lorentz and the Drude model, respectively, w e r e o b s e r v e d i n t h e c o m p o s i t e s . D u e t o t h e magnetocrystalline anisotropy and saturation magnetization, the real permeability enhanced from 1.17 to 4.1 with the increasing FGR content from 6 to 98 vol%. In addition, the frequency dispersion of permeability was attributed to the domain wall and the gyromagnetic spin resonance. The magnetic loss decreased firstly in the low frequency, attributing to the natural resonance, and then increased in the high frequency from the eddy current.

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Three-dimensional graphene network/phenolic resin composites towards tunable and weakly negative permittivity

Cited by 36 publications

References 43 publications

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

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

A Review on the Contemporary Development of Composite Materials Comprising Graphene/Graphene Derivatives

Magnetic negative permittivity with dielectric resonance in random Fe3O4@graphene-phenolic resin composites

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