Graphene multilayered sheets assembled by porous Bi2Fe4O9 microspheres and the excellent electromagnetic wave absorption properties

Lin, Ying; Dai, Jingjing; Yang, Haibo; Wang, Lei; Wang, Fen

doi:10.1016/j.cej.2017.11.150

Cited by 165 publications

(38 citation statements)

References 44 publications

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“…The extensive utilization of electronic devices and wireless equipment in civil and military fields has resulted in serious electromagnetic radiation pollution, which has harmful effects on human body and electronic apparatus [1][2][3]. Therefore, the effective electromagnetic wave (EMW) absorption materials are urgently designed and explored [4].…”

Section: Introductionmentioning

confidence: 99%

“…The coefficient of impedance match can be described as follows: [10] ⁄ = √ ⁄ tanh [ (2 √ ⁄ ] Eq. (1) According to the transmission line theory, the reflection loss (RL) can be expressed as below: [11] RL = 20log| − + | Eq. 2where, μ r = µ′ + iµ′′ and ε r = ɛ′ + iɛ′′ are the complex permeability and permittivity of the absorbent, respectively.…”

Section: Introductionmentioning

confidence: 99%

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In-situ growth of Fe/Fe3O4/C hierarchical architectures with wide-band electromagnetic wave absorption

Meng

Zhang

et al. 2018

Ceramics International

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Carbon materials have aroused extensive interests for their remarkable electrical properties as electromagnetic wave (EMW) absorption. However, the synthesis of the wide-band electromagnetic wave absorbent is an insuperable challenge for attaining effective refection loss and electromagnetic matching. Herein, a facile method for large-scale synthesis of monodispersed Fe/Fe 3 O 4 /C composite microspheres is proposed. The carbon microspheres (1-2 μm in diameter) imbedded with nanosized Fe/Fe 3 O 4 2 particles (10-20 nm) are uniformly produced by polymerization and carbothermic reduction processes. The products exhibit the minimum refection loss-45.5 dB at 9.4 GHz and a broad bandwidth of 4.1 GHz below-10 dB from 7.8 GHz to 11.9 GHz with a thickness of 3.0 mm. The absorption mechanism indicates a unique deviated Debye dipolar relaxation effect in the absorbing bandwidth.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In-situ growth of Fe/Fe3O4/C hierarchical architectures with wide-band electromagnetic wave absorption

Meng

Zhang

et al. 2018

Ceramics International

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“…To further explore the microwave absorption mechanism of the composite, two crucial factors including impedance matching ( Z in / Z 0 ) and attenuation constant (

) are calculated as shown in Figure 12 . To achieve outstanding microwave absorption performance, a better impedance matching degree and larger attenuation constant should be satisfied simultaneously [ 37 , 38 , 39 , 40 , 41 , 42 , 43 ]. The | Z in / Z 0 | value equal to 1.0 implies the zero-reflection of the incident EM wave at the front surface of absorber, which is required for the ideal impedance matching.…”

Section: Resultsmentioning

confidence: 99%

In-Situ Conversion of ZnO/Ni3ZnC0.7/CNT Composite from NiZn Bimetallic MOF Precursor with Enhanced Electromagnetic Property

Huang

Yang

et al. 2018

Nanomaterials

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ZnO/Ni3ZnC0.7/x% CNT (x = 0, 2, 5, 10) urchin-like structures have been synthesized using a facile method based on metal-organic frameworks (MOFs) and applied as the electromagnetic absorber. The results of the experiments demonstrate that the content of multi-wall carbon nanotubes (MWCNT) has a great influence on the absorbing performance of the hybrid material. Conduction loss, interfacial polarization and ferromagnetic resonance all contribute to the electromagnetic absorption. The urchin-like ZnO/Ni3ZnC0.7/5% CNT composite presents excellent absorbing properties. When the filler loading of ZnO/Ni3ZnC0.7/5% CNT composite in paraffin matrix is only 10 wt.%, a minimum reflection loss of −33.2 dB is achieved at a layer thickness of 4.9 mm.

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“…[17,18] Thus, considerable efforts have been made to rationally synthesize and design the structure of GO-based composites. Lin et al [19] prepared a 3D porous Bi 2 Fe 4 O 9 /GO composite via an etching method, and the MA performance has been greatly improved due to the synergistic effect of GO and Bi 2 Fe 4 O 9 . Han et al [20] coated hollow ZnO spheres with GO for MA with a reflection loss (RL) of −45.1dB and a corresponding improvement in bandwidth.…”

Section: Introductionmentioning

confidence: 99%

MOF Induces 2D GO to Assemble into 3D Accordion‐Like Composites for Tunable and Optimized Microwave Absorption Performance

Zhao

et al. 2020

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Three‐dimensional (3D) materials assembled by 2D layered lamella can provide abundant interfaces which are greatly advantageous for high‐performance microwave absorbers. Herein, accordion‐like CeO2−x/reduced graphene oxide (CeO2−x/RGO) hybrid materials can be successfully synthesized by a solvothermal and hydrothermal method, which are composed of laminated RGO sheets and confined CeO2−x nanoparticles (NPs). The multilayer structure is attributed to the process of Ce‐MOF dissolving into NPs, then the NPs combining with graphene oxide (GO) to induce the 2D GO assembled into 3D accordion‐like composites. The 3D accordion‐like CeO2−x/RGO simultaneously utilizes the insulated CeO2−x and highly conductive RGO to assemble into the laminated structure with moderate electromagnetic parameters. The 3D‐laminated lightweight CeO2−x/RGO composite exhibits excellent attenuation ability of an ultrabroad bandwidth (5.84 GHz) and a maximum reflection loss (−50.6 dB) which can be ascribed from the glorious impedance matching, synergistic effect between RGO sheets and the embedded CeO2−x NPs. An off‐axis electron holography is carried out to visualize the spatial electrical potential and charge distribution around the CeO2−x/RGO heterojunction, which clarifies the dipole polarization and interfacial polarization. This work enlightens a simple strategy to fabricate an excellent 3D laminated RGO‐based microwave absorber.

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Graphene multilayered sheets assembled by porous Bi2Fe4O9 microspheres and the excellent electromagnetic wave absorption properties

Cited by 165 publications

References 44 publications

In-situ growth of Fe/Fe3O4/C hierarchical architectures with wide-band electromagnetic wave absorption

In-situ growth of Fe/Fe3O4/C hierarchical architectures with wide-band electromagnetic wave absorption

In-Situ Conversion of ZnO/Ni3ZnC0.7/CNT Composite from NiZn Bimetallic MOF Precursor with Enhanced Electromagnetic Property

MOF Induces 2D GO to Assemble into 3D Accordion‐Like Composites for Tunable and Optimized Microwave Absorption Performance

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