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Controllable construction design of Co@C@MWCNTs interpenetrating composite with tunable enhanced electromagnetic wave absorption

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Abstract

Lightweight absorbers with strong broadband microwave absorption are highly desired in military and civil fields. In this work, a 3D interpenetrating network formed from a Co@C@ MWCNTs composite was synthesized via a combined wet chemical and pyrolysis route. Because of strengthening interfacial polarization, suitable impedance matching and synergistic effects, the Co@C@MWCNTs hierarchical composite exhibited outstanding microwave absorption properties. An optimal reflection loss reached − 55.7 dB at 8.7 GHz and its effective bandwidth (RL < − 10 dB) achieved 4 GHz (7.4–11.4 GHz) at an absorber thickness of 3 mm with a low filler content of 10 wt%. Furthermore, an effective bandwidth of 12.4 GHz (4.5–16.9 GHz) was obtained by varying the thickness from 2 to 4.5 mm. The superior microwave absorption performance originated from the enhanced interfacial polarization, multiple reflections, conductive network, synergistic effects and an improved impedance matching between Co–C and MWCNTs. This work provides a strategy to rationally design novel lightweight absorbers with strong microwave absorption.

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Acknowledgements

The authors acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 61701386), the Young Star Project of Science and Technology of Shaanxi Province (Grant No. 2019KJXX-033), Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2017JQ5060).

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  1. School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an, 710021, People’s Republic of China

    Yan Wang, Xiaochuang Di & Zhao Lu

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  1. Yan Wang
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Correspondence to Yan Wang.

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Wang, Y., Di, X. & Lu, Z. Controllable construction design of Co@C@MWCNTs interpenetrating composite with tunable enhanced electromagnetic wave absorption. J Mater Sci: Mater Electron 32, 1061–1072 (2021). https://doi.org/10.1007/s10854-020-04881-8

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  • DOI: https://doi.org/10.1007/s10854-020-04881-8

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