Temperature dependent microwave attenuation behavior for carbon-nanotube/silica composites

Wen, Bo; Cao, Mao‐Sheng; Hou, Zhi‐Ling; Song, Wei‐Li; Zhang, Lu; Lu, Mingming; Jin, Haibo; Fang, Xiao‐Yong; Wang, Wenzhong; Yuan, Jie

doi:10.1016/j.carbon.2013.07.110

Cited by 1,082 publications

(410 citation statements)

References 68 publications

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“…1,2 On the other hand, ceramics, ferrites, metallic magnets, CNTs and their hybrids are widely utilized as conducting fillers into polymer matrix to achieve high electrical conducting composites for efficient EMI shielding application. [3][4][5][6][7][8] Cao et al reported the composite loading with 6 vol.% CdS-MWCNTs shows the best absorption of -47 dB at 473 K with a thickness of 2.6 mm in the temperature range of 323-573 K and X band. 6 CNT/Silica composite loading with 10 wt% MWCNTs can show EMI SE of ∼ 24.5 dB in X-band at temperature range from 100 to 500 • C. 7 Further, carbon fiber/silica composites can show shielding effectiveness greater than 10 dB in X-band region.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6][7][8] Cao et al reported the composite loading with 6 vol.% CdS-MWCNTs shows the best absorption of -47 dB at 473 K with a thickness of 2.6 mm in the temperature range of 323-573 K and X band. 6 CNT/Silica composite loading with 10 wt% MWCNTs can show EMI SE of ∼ 24.5 dB in X-band at temperature range from 100 to 500 • C. 7 Further, carbon fiber/silica composites can show shielding effectiveness greater than 10 dB in X-band region. 8 Despite good EMI shielding performance in some cases, their drawbacks are high loading content, thickness, high density and poor stability, which severely hinder their applications.…”

Section: Introductionmentioning

confidence: 99%

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An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

Kumar

Cho

et al. 2017

AIP Advances

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Here, we study the self-aligned asymmetric electrically conductive composite thin film prepared via casting of graphene oxide (GO)/poly (vinylidene-hexafluoropropylene) (PVDF-HFP) dispersion, followed by low temperature hydriodic acid reduction. The results showed that composite thin film revealed the high orientation of graphene sheets along the direction of film surface. However, graphene sheets are asymmetrically distributed along the film thickness direction in the composite film. Both sides of as prepared composite film showed different surface characteristics. The asymmetric surface properties of composite film induced distinction of surface resistivity response; top surface resistivity (21 Ohm) is ∼ 4 times higher than bottom surface resistivity (5 Ohm). This asymmetric highly electrically conducting composite film revealed efficient electromagnetic interference (EMI) shielding effectiveness of ∼ 30 dB. This study could be crucial for achieving aligned asymmetric composite thin film for high-performance EMI shielding radiation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

Kumar

Cho

et al. 2017

AIP Advances

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“…It was found that the ɛ″ of the FGR-PR composites increased with increasing FGR content, indicating enhanced dielectric loss. Dielectric loss was mainly caused by interfacial polarization and conduction [45][46][47][48][49]. The interfacial polarization enhanced with the increasing FGR content, resulting in enhancement of interfacial polarization loss.…”

Section: Dielectric Properties Of the Fgr-pr Compositesmentioning

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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“…1,2 Searching for high-efficiency and lightweight EA materials is still a challenging work. 3 Several materials with specific structure have been used for EA, such as metallic or alloy nanoparticles including dendrite-like Fe x O y , 4 Fe x O y @SiO 2 core-shell nanostructure, 5 and ZnO nanorods, 6 carbon materials including graphite nanosheets, 7 carbon nanotubes (CNTs), 8,9 carbon nanocoils, 10 and reduced grapheme oxides (RGO), 11 conducting polymers (CPs) including polythiophene (PTh), 12 polyaniline (PANi), 13 and polypyrrole (PPy). 14,15 Lightweight is one of the key factors that can significantly influence the practical applications of EA materials because it can reduce the weight and strengthen the manipulation of electric equipment.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional (3D) α-Fe2O3/polypyrrole (PPy) nanocomposite for effective electromagnetic absorption

et al. 2016

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The lightweight and 3-dimensional reticulated α-Fe2O3/PPy hybrids were successfully fabricated via a facile one-pot polyreaction. The measured complex permittivity and microwave attenuation performance suggest that the dielectric properties of PPy can be regulated by the mass ratio of added α-Fe2O3. The two dielectric resonance peaks of complex permittivity can be ascribed to the interface capacitor-like structure. An equivalent circuit model was established to explain the nonlinear resonance behavior of the α-Fe2O3/PPy wax composites. The addition of α-Fe2O3 properly tuned the dielectric constant to endow the composites with highly efficient microwave absorption. The minimum reflection loss of α-Fe2O3/PPy wax composites were enhanced to nearly −29dB with an effective bandwidth (RL≤ − 10dB) up to 5.0GHz. The numerical method was proposed to calculate the optimum thickness for minimum RL at expected frequency by detailed investigation on the transmission formula. Moreover, the required thickness for optimum absorption efficiency at expected frequency can be obtained directly.

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Temperature dependent microwave attenuation behavior for carbon-nanotube/silica composites

Cited by 1,082 publications

References 68 publications

An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

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

Three-dimensional (3D) α-Fe2O3/polypyrrole (PPy) nanocomposite for effective electromagnetic absorption

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