The ordered mesoporous carbon coated graphene as a high-performance broadband microwave absorbent

There has been a great challenge in developing highly efficient electromagnetic microwave absorbers with strong absorbility, wide effective absorbing bandwidth and lightweight to solve the increasingly severe electromagnetic pollution. Here, we unveil the great potential of highly ordered mesoporous...

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Bibliographic Details
Published in:Carbon (New York) 2021-07, Vol.179, p.435-444
Main Authors: Wang, Lei, Du, Zhen, Xiang, Luoxing, Hou, Dan, Zhu, Shuheng, Zhu, Jianfeng, Mai, Yiyong, Che, Renchao
Format: Article
Language:English
Subjects:
Bandwidth
Bandwidths
Broadband
Carbon
Electromagnetics
Graphene
Mesoporous structure
Microwave absorbers
Microwave absorption
Nanocomposites
Two-dimensional materials
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Summary:There has been a great challenge in developing highly efficient electromagnetic microwave absorbers with strong absorbility, wide effective absorbing bandwidth and lightweight to solve the increasingly severe electromagnetic pollution. Here, we unveil the great potential of highly ordered mesoporous carbon coated graphene composites in the application of microwave absorption. The ordered mesoporous carbon composites possess well-defined spherical mesopores that are uniformly distributed on graphene surfaces and with uniform diameters of ∼20 nm (graphene@mesoporous carbon, abbreviated as G/MC). This renders the nanocomposites with high BET surface areas of up to 316 m2 g−1. Impressively, the G/MC nanosheets carbonized at 900 °C (G/MC-900) exhibit an outstanding microwave absorbility, with a maximum reflection loss (RL) of −66.1 dB and an exceptionally broad effective absorbing bandwidth (EAB) of 8.2 GHz (RL 
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2021.04.048