Multifunctional broadband microwave absorption of flexible graphene composites

Zhang, Kailun; Zhang, Junying; Hou, Zhi‐Ling; Bi, Shuping; Zhao, Quanliang

doi:10.1016/j.carbon.2018.10.024

Cited by 207 publications

(59 citation statements)

References 44 publications

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“…Excellent EM property endows the NF‐P material with high‐effective absorption performance, as depicted in Figure 4i–l . Compared with NF composite, the NF‐P composites show a significantly increased microwave absorption.…”

Section: Resultsmentioning

confidence: 97%

Molecular Patching Engineering to Drive Energy Conversion as Efficient and Environment‐Friendly Cell toward Wireless Power Transmission

Shu

Cao

Zhang

et al. 2020

Adv Funct Materials

201

106

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Spatial electromagnetic (EM) radiation, big data, is both an opportunity and a challenge. Harvesting and converting waste EM energy for high‐efficient recycling has a huge significance in the energy field. Herein, a new and effective patching engineering method using conductive polymers to repair magnetic graphene (NF‐P) is proposed, tailoring the microstructure network controllably, including conductive network and relaxation genes. It realizes the precise tuning of EM property, and the EM response shows a significant increase of 52%. The energy transformation inside materials is surveyed, and a revolutionary mode of energy conversion is constructed, ingeniously utilizing the stored electrical energy and the converted heat energy inside the material with the theoretical utilization of absorbed EM energy up to 100%. The NF‐P patching network serves as a prototype for a potential cell device with the EM energy conversion improved by ≈10 times and effective bandwidth increased by 13 GHz that covers the entire research frequency band (2–18 GHz). This research opens up a new idea for energy utilization inside materials, providing a novel and effective path for harvesting, converting and delivering spatial EM energy.

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Section: Resultsmentioning

confidence: 97%

Molecular Patching Engineering to Drive Energy Conversion as Efficient and Environment‐Friendly Cell toward Wireless Power Transmission

Shu

Cao

Zhang

et al. 2020

Adv Funct Materials

201

106

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“…Therefore, light microwave absorbents with strong absorption and a broadband frequency region are highly demanded. [6][7][8] Based on magnetic loss mechanism, conventional magnetic metals and metal oxides show excellent microwave absorption performance; [9][10][11][12] however, their high density, poor stability, and big mass ratio in the composites severely limit the application. [13,14] Thus, the development of new MAMs basing on other mechanism provides a new strategy.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Microwave Absorption: The Composite of Fe₃O₄ Flakes and Reduced Graphene Oxide with Improved Interfacial Polarization

Jiao

et al. 2020

Adv Eng Mater

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Herein, to further improve the microwave absorption performance, the composite of Fe 3 O 4 flakes and reduced graphene oxide (RGO/Fe 3 O 4) via hydrothermal method followed by H 2 reduction is rationally designed and synthesized. Compared with pure Fe 3 O 4 flakes and RGO/granular Fe 3 O 4 composite, the obtained RGO/Fe 3 O 4 exhibit remarkable enhancement of microwave absorption. The measurement results indicate that the maximum reflection loss of RGO/ Fe 3 O 4 can reach À47.2 dB at the thickness of 2.4 mm and the effective absorption bandwidth less than À10 dB reaches 6.4 GHz (from 11.36 to 17.76 GHz), much higher than that of pure Fe 3 O 4 flakes and RGO/granular Fe 3 O 4 composite. The improved performances are believed to be from the rationally designed heterointerfaces, which are created by the combination of Fe 3 O 4 flakes and graphene. The construction of abundant heterointerfaces is a valid strategy to improve the microwave absorption performance.

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“…Electromagnetic wave absorbing (EMWA) materials with strong absorption, wide absorption bandwidth, thin thickness, light weight, and high thermal stability are widely used in military and civilian fields [1][2][3][4][5][6][7][8][9][10]. During the past decades, expanded graphite (EG) was widely researched in the area of EMWA considering its wider source, lower cost, larger surface area, high surface activity, rich pore structure, etc., which can be applied in lithium ion batteries [11], biomedicine [12], or electronic heat dissipation [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Microwave Absorption Properties of Sulfur-Free Expanded Graphite/Fe3O4 Composites

Sun

et al. 2020

Molecules

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In this study, sulfur-free expanded graphite (EG) was obtained by using flake graphite as the raw material, and EG/Fe3O4 composites with excellent microwave absorption properties were prepared by a facile one-pot co-precipitation method. The structure and properties of as-prepared EG/Fe3O4 were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), X-ray diffraction (XRD), Raman, X-ray photoelectron spectrometry (XPS), thermogravimetric (TG), and vibrating sample magnetometry (VSM) characterizations. The Fe3O4 intercalated between the layers of expanded graphite forms a sandwich-like structure which is superparamagnetic and porous. When applied as a microwave absorber, the reflection loss (RL) of EG/Fe3O4 reaches −40.39 dB with a thickness of 3.0 mm (10 wt% loading), and the effective absorption bandwidth (EAB < −10 dB) with RL exceeding −10 dB is 4.76–17.66 GHz with the absorber thickness of 1.5–4.0 mm. Considering its non-toxicity, easy operation, low cost, suitability for large-scale industrial production, and excellent microwave absorbing performance, EG/Fe3O4 is expected to be a promising candidate for industrialized electromagnetic absorbing materials.

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Multifunctional broadband microwave absorption of flexible graphene composites

Cited by 207 publications

References 44 publications

Molecular Patching Engineering to Drive Energy Conversion as Efficient and Environment‐Friendly Cell toward Wireless Power Transmission

Molecular Patching Engineering to Drive Energy Conversion as Efficient and Environment‐Friendly Cell toward Wireless Power Transmission

Enhanced Microwave Absorption: The Composite of Fe₃O₄ Flakes and Reduced Graphene Oxide with Improved Interfacial Polarization

Synthesis and Microwave Absorption Properties of Sulfur-Free Expanded Graphite/Fe3O4 Composites

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Multifunctional broadband microwave absorption of flexible graphene composites

Cited by 207 publications

References 44 publications

Molecular Patching Engineering to Drive Energy Conversion as Efficient and Environment‐Friendly Cell toward Wireless Power Transmission

Molecular Patching Engineering to Drive Energy Conversion as Efficient and Environment‐Friendly Cell toward Wireless Power Transmission

Enhanced Microwave Absorption: The Composite of Fe3O4 Flakes and Reduced Graphene Oxide with Improved Interfacial Polarization

Synthesis and Microwave Absorption Properties of Sulfur-Free Expanded Graphite/Fe3O4 Composites

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Enhanced Microwave Absorption: The Composite of Fe₃O₄ Flakes and Reduced Graphene Oxide with Improved Interfacial Polarization