23October2019

Nano-Micro Letters

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

Shanshan Wang1, Yingchun Xu1, Ruru Fu1, Huanhuan Zhu1, Qingze Jiao1, 2, Tongying Feng2, Caihong Feng1, Daxin Shi1, Hansheng Li1, Yun Zhao1, *

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Nano-Micro Lett. (2019) 11: 76

First Online: 13 September 2019 (Article)

DOI:10.1007/s40820-019-0307-8

*Corresponding author. E-mail: zhaoyun@bit.edu.cn (Yun Zhao)

 

Abstract

 


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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 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.       


 

Keywords

Fe-doped Co-MOF; Hierarchically porous; rGO; Broadband; Microwave absorption performance

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