Issue

Vol. 11 (2019)

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

https://doi.org/10.1007/s40820-019-0307-8
Shanshan Wang
School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Zhuhai 100081, People’s Republic of China
Yingchun Xu
School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Zhuhai 100081, People’s Republic of China
Ruru Fu
School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Zhuhai 100081, People’s Republic of China
Huanhuan Zhu
School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Zhuhai 100081, People’s Republic of China
Qingze Jiao
School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Zhuhai 100081, People’s Republic of China
Tongying Feng
School of Materials and the Environment, Beijing Institute of Technology, Zhuhai 519085, People’s Republic of China
Caihong Feng
School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Zhuhai 100081, People’s Republic of China
Daxin Shi
School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Zhuhai 100081, People’s Republic of China
Hansheng Li
School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Zhuhai 100081, People’s Republic of China
Yun Zhao
School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Zhuhai 100081, People’s Republic of China

Corresponding Author: Yun Zhao

zhaoyun@bit.edu.cn

Nano-Micro Letters, Vol. 11 (2019), Article Number: 76

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 Co-based 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 (RLmin) 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 GHz (8.88–18 GHz) 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.


Highlights:


1 Hierarchically porous Fe–Co/N-doped carbon/rGO (Fe–Co/NC/rGO) composites were successfully prepared. Macropores, mesopores, and micropores coexisted in the composites.
2 Hierarchically porous Fe–Co/NC/rGO showed effective bandwidth of 9.29 GHz.

Keywords

Fe-doped Co-MOF Hierarchically porous rGO Broadband Microwave absorption performance
Wang, Shanshan, Yingchun Xu, Ruru Fu, Huanhuan Zhu, Qingze Jiao, Tongying Feng, Caihong Feng, Daxin Shi, Hansheng Li, and Yun Zhao. 2019. “Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/RGO Composites for Broadband Microwave Absorption”. Nano-Micro Letters 11 (September):76. https://doi.org/10.1007/s40820-019-0307-8.
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