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Research Article

Hydrogel-based optically and mechanically manipulable broadband microwave absorber

Xiqiao Chen1,2, Lin Du2, Guobao Jiang1, Zhuang Wu2, Yingchang Zou1, Yanhong Zou2( )
School of Electronic Information and Electrical Engineering, Changsha University, Changsha 410022, China
School of Physics and Electronics, Hunan University, Changsha 410082, China
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Graphical Abstract

The hydorgel-based microwave absorber enables effective absorption bandwidth covering 6.3–18 GHz, and exhibits switchable optical and mechanical properties through the transition from room-temperature to frozen condition.

Abstract

Microwave absorbers with unique optical and mechanical performance are urgent for complex electromagnetic environment. Here, we demonstrate the mechanically flexible, optically transparent, and microwave-absorbing polyacrylamide (PAM) hydrogel, in which the polar water molecules with high polarization contribute to the efficient microwave attenuation, but the binding between water molecules and PAM will slow down the orientation polarization of polar molecules. Meanwhile, the dominated dielectric property of water molecules in PAM hydrogel determines that the molecules displacement in polymer mixture is feasible for manipulating permittivity. Besides, by decreasing temperature, the flexible and transparent hydrogel will switch to rigid and opaque state as the phase conversion between amorphous and polycrystal state. By constructing structures with such hydrogel, the obtained absorber also exhibits the optical and mechanical switchable properties, covering the effective absorption within 5.7–18 GHz. This work provides an effective method to fabricate optically and mechanically manipulable microwave absorbers for intelligent electromagnetic stealth systems.

Keywords

microwave absorptionpolyacrylamide hydrogeloptical propertiesmechanical properties

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Nano Research
Volume 16 Issue 7,
July 2023
Pages 10175-10182
DOI: 10.1007/s12274-023-5579-0
Cite this article:
Chen X, Du L, Jiang G, et al. Hydrogel-based optically and mechanically manipulable broadband microwave absorber. Nano Research, 2023, 16(7): 10175-10182. https://doi.org/10.1007/s12274-023-5579-0
Topics:
Microwave sensors

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Received: 02 December 2022
Revised: 25 January 2023
Accepted: 12 February 2023
Published: 13 April 2023
© Tsinghua University Press 2023
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