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Research Article

Alkali and ion exchange co-modulation strategies to design magnetic–dielectric synergistic nano-absorbers for tailoring microwave absorption

Yue Wu, Shujuan Tan( ), Taichen Zhang, Ming Zhou, Gang Fang, Guangbin Ji
School of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
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Graphical Abstract

Switchable “on/off” and broadband microwave absorbers were successfully constructed based on typical metal-organic framework materials through a facial ion exchange strategy. Hence, this work will propose a switchable microwave absorption behavior for the design of lightweight magnetic@carbon composites.

Abstract

Alkali and Co2+ co-modulation has seldom been investigated as a prospective strategy to achieve high-efficient microwave absorbing (MA) materials. In this work, a new alkali and Co ion exchange co-modulation strategy was first reported, leading to broadband MA capacity through simultaneous manipulating multiple factors, such as composition, micromorphology, and heterogeneous interface. And enhancements in impedance matching and magnetic–dielectric loss were synergistically realized. Consequently, the optimized FeCo alloy@porous carbon (FPC) nanocomposite with the alkali regulation delivered an effective absorption bandwidth (EAB) of 6.72 GHz, making it the merely single FeCo-based metal-organic framework derived FPC absorber with a low filler content of 15 wt.%. Interestingly, the nanocomposites by ion exchange strategy realized the switchable “on/off” states on electromagnetic response. Furthermore, the radar cross-section (RCS) reduction value of the products reached 25.6 dB·m2 under the incident angle of 0°. In brief, this work not only offers the special role of alkali and Co2+ co-modulation in composition regulation, structure design, and MA capacity, but also provides a reliable strategy to develop smart nano-absorbers to cope with electromagnetic pollution issues.

Keywords

microwave absorptionalkali regulationion exchange strategyswitchable on/off modenano-absorbers

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Nano Research
Volume 16 Issue 7,
July 2023
Pages 8522-8532
DOI: 10.1007/s12274-023-5799-3
Cite this article:
Wu Y, Tan S, Zhang T, et al. Alkali and ion exchange co-modulation strategies to design magnetic–dielectric synergistic nano-absorbers for tailoring microwave absorption. Nano Research, 2023, 16(7): 8522-8532. https://doi.org/10.1007/s12274-023-5799-3
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Received: 04 April 2023
Revised: 25 April 2023
Accepted: 02 May 2023
Published: 13 June 2023
© Tsinghua University Press 2023
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