Synergistically assembled MWCNT/graphene foam with highly efficient microwave absorption in both C and X bands

Chen, Honghui; Huang, Zhiyu; Huang, Yi; Zhang, Yi; Ge, Zhen; Qin, Bin; Liu, Zunfeng; Shi, Qian; Xiao, Peishuang; Yang, Yang; Zhang, Tengfei; Chen, Yongsheng

doi:10.1016/j.carbon.2017.09.007

Cited by 302 publications

(120 citation statements)

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“…In addition, rGO with a porous structure can effectively broaden the effective bandwidth because the microwaves entering the pores of rGO can be reflected and multiply scattered [31][32][33][34][35][36]. Hence, we introduce the Fe-doped Co-MOF into porous cocoon-like rGO to prepare multicomponent and hierarchically porous Fe-Co/NC/rGO composites.…”

mentioning

confidence: 99%

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Wang

et al. 2019

Nano-Micro Lett.

145

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HIGHLIGHTS• Hierarchically porous Fe-Co/N-doped carbon/rGO (Fe-Co/NC/rGO) composites were successfully prepared. Macropores, mesopores, and micropores coexisted in the composites.• Hierarchically porous Fe-Co/NC/rGO showed effective bandwidth of 9.29 GHz.ABSTRACT Developing lightweight and broadband microwave absorbers for dealing with serious electromagnetic radiation pollution is a great challenge. Here, a novel Fe-Co/N-doped carbon/reduced graphene oxide (Fe-Co/NC/rGO) composite with hierarchically porous structure was designed and synthetized by in situ growth of Fe-doped Cobased metal organic frameworks (Co-MOF) on the sheets of porous cocoon-like rGO followed by calcination. The Fe-Co/NC composites are homogeneously distributed on the sheets of porous rGO. The Fe-Co/NC/rGO composite with multiple components (Fe/Co/NC/rGO) causes magnetic loss, dielectric loss, resistance loss, interfacial polarization, and good impedance matching. The hierarchically porous structure of the Fe-Co/NC/rGO enhances the multiple reflections and scattering of microwaves. Compared with the Co/NC and Fe-Co/NC, the hierarchically porous Fe-Co/NC/rGO composite exhibits much better microwave absorption performances due to the rational composition and porous structural design. Its minimum reflection loss (RL min ) reaches − 43.26 dB at 11.28 GHz with a thickness of 2.5 mm, and the effective absorption frequency (RL ≤ − 10 dB) is up to 9.12 with the same thickness of 2.5 mm. Moreover, the widest effective bandwidth of 9.29 GHz occurs at a thickness of 2.63 mm. This work provides a lightweight and broadband microwave absorbing material while offering a new idea to design excellent microwave absorbers with multicomponent and hierarchically porous structures.

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mentioning

confidence: 99%

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Wang

et al. 2019

Nano-Micro Lett.

145

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“…On the basis of the remarkable absorption performances of 3D graphene bulk materials, Huang et al further constructed a MWCNT/graphene foam (CGF) with a synergistically conductive network to strengthen the absorption of both the C and X bands. [15a] In addition to the enhanced ohmic losses, the distinctive multilevel nano/microstructure for multiscaled scattering, the polarization attenuation, and the well‐balanced dielectric properties played vital roles in the superb performance of this material. The optimal CGF possessed an average absorption intensity of 22.5 dB in both the C and X bands.…”

Section: Graphene‐based Materials For Microwave Absorptionmentioning

confidence: 99%

“…Reproduced with permission. [15a] Copyright 2017, Elsevier. Schematic of b) interface effect between PPy and RGO and c) electronic transport in a conductive network that consists of S‐PPy/RGO in paraffin matrix.…”

Section: Graphene‐based Materials For Microwave Absorptionmentioning

confidence: 99%

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Graphene‐Based Materials toward Microwave and Terahertz Absorbing Stealth Technologies

Chen

Huang

et al. 2019

Advanced Optical Materials

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219

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Electromagnetic wave absorbing materials play an increasingly important role in consumer electronics and military defense. The remarkable merits of atomically thin graphene structures and their exotic optoelectronic properties provide new opportunities to design high‐performance electromagnetic wave absorbers. This progress report summarizes the recent advances in graphene‐based microwave and terahertz stealth materials. In the first section, the theory of electromagnetic wave absorption and the evaluation methods for absorption performance are briefly introduced. Then, representative graphene‐based microwave and terahertz absorber systems are presented with an emphasis on the selection of the absorbent component and structural design. In the last section, the perspectives and future research directions of this promising field are discussed.

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“…Up until now, a range of carbon materials with different forms, both traditional carbon materials and new nano-carbon materials such as carbon nanotubes, [11][12][13] carbon nanobers, [14][15][16] carbon spheres, [17][18][19] carbon foams, 13,20 graphite, [21][22][23] etc., have been utilized as the main component of novel electromagnetic absorbers. Since it was successfully prepared, graphene has received great attention due to its excellent electrical and thermal conductivity, as well as its superior mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Solvent-assisted thermal reduction of microcrystalline graphene oxide with excellent microwave absorption performance

et al. 2018

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aTo prepare a new kind of electromagnetic wave absorber, and improve the processing technology and accessional value of natural microcrystalline graphite minerals (NMGMs), reduced microcrystalline graphene oxide (rGO-M), a novel absorber with high absorption, low reflection and a wide absorption band, was prepared from NMGMs using a solvent-assisted thermal reduction method. Moreover, the asproduced rGO-M with adjustable electrical resistivity can be easily transferred into well distributed bulk materials by freeze-drying technology. These unique structures and compositions make a great contribution to the impedance match, and cause strong conductive loss and various dipole polarization effects which greatly enhance the absorption. Meanwhile, the effective bandwidths below À5 dB and À10 dB are 11.7 GHz and 3.32 GHz respectively, and the reflection loss can reach À42.68 dB. The study will be beneficial to the development of carbon resources and carbon materials research. Besides, it can provide a scientific basis for the further improvement of the comprehensive utilization and the level of deep processing technology of NMGM resources.

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Synergistically assembled MWCNT/graphene foam with highly efficient microwave absorption in both C and X bands

Cited by 302 publications

References 58 publications

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

Graphene‐Based Materials toward Microwave and Terahertz Absorbing Stealth Technologies

Solvent-assisted thermal reduction of microcrystalline graphene oxide with excellent microwave absorption performance

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