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Magnetic expanded graphite (EG) hybrids were synthesized by co-intercalation polymerization of aniline together with transition metal ions. Experimental results show that metal ions (Fe, Co, Ni, and Cu) and even their mixtures can co-intercalate into graphite interlayers with flexibly controllable ratios and contents. Among these co-intercalation compounds, Fe/Ni-intercalated graphite with a predesigned mole ratio of 1:3 transforms into NiFe2O4/FeNi3@EG during the annealing process. The synthesized magnetic EG hybrids present multiband microwave absorption in C and X bands due to improved impedance match as well as significantly enhanced interfacial polarization relaxation induced by multi-componential metals. The reflection values of −39.1 dB at 6.95 GHz and −25.7 dB at 9.4 GHz are achieved with an ultra-low loading of 5 wt.%. This work provides a flexible approach for tuning the components and structures of magnetic EG hybrids, which may contribute to the development of microwave absorption materials with superior performances.


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Multi-componential metal intercalated graphite hybrids synthesized by co-intercalation polymerization towards high-efficient microwave absorptions

Show Author's information Junhua Su1Qinbo Ma1Longkun Que1Hunan Jiang1Xiaoling Xu1,2Yong Wang1,2Yifan Guo1,2,3,4( )Zuowan Zhou1,2,3,5
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
School of Chemistry, Southwest Jiaotong University, Chengdu 610031, China
Yibin Research Institute, Southwest Jiaotong University, Yibin 644000, China
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Research Institute of Frontier Science, Southwest Jiaotong University, Chengdu 610031, China

Abstract

Magnetic expanded graphite (EG) hybrids were synthesized by co-intercalation polymerization of aniline together with transition metal ions. Experimental results show that metal ions (Fe, Co, Ni, and Cu) and even their mixtures can co-intercalate into graphite interlayers with flexibly controllable ratios and contents. Among these co-intercalation compounds, Fe/Ni-intercalated graphite with a predesigned mole ratio of 1:3 transforms into NiFe2O4/FeNi3@EG during the annealing process. The synthesized magnetic EG hybrids present multiband microwave absorption in C and X bands due to improved impedance match as well as significantly enhanced interfacial polarization relaxation induced by multi-componential metals. The reflection values of −39.1 dB at 6.95 GHz and −25.7 dB at 9.4 GHz are achieved with an ultra-low loading of 5 wt.%. This work provides a flexible approach for tuning the components and structures of magnetic EG hybrids, which may contribute to the development of microwave absorption materials with superior performances.

Keywords: microwave absorption, transition metal, expanded graphite, co-intercalation, intercalation polymerization

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Publication history
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Acknowledgements

Publication history

Received: 18 August 2022
Revised: 07 December 2022
Accepted: 09 January 2023
Published: 19 February 2023
Issue date: May 2023

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (No. 51573149) and the Key R&D Projects in Sichuan Province (Nos. 2020ZDZX0005 and 2020ZDZX0008). We would like to thank Analysis and Testing Center of Southwest Jiaotong University for providing Raman test platform and other test consultation.

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