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Research Article

Multiaxial electrospun generation of hollow graphene aerogel spheres for broadband high-performance microwave absorption

Tian Li1, Dandan Zhi1, Yao Chen1, Bing Li2, Zuowan Zhou1, Fanbin Meng1()
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
Shandong Qiangjunwei Intelligent Equipment Co. LTD., Yantai 264000, China
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Abstract

Although graphene aerogels (GA) have been attracted great attention, the easy-operation and large-scale production of GA are still challenges. Further, most GA have a monolith-like appearance, limiting their application-specific needs. Herein, we highlight graphene aerogel spheres with controllable hollow structures (HGAS) that are delicately designed and manufactured via coaxial electrospinning coupled with freeze-drying and calcination. The HGAS exhibit a spherical configuration at the macroscale, while the construction elements of graphene on the microscale showing an interconnected radial microchannel structure. Further, ball-in-ball graphene aerogel spheres (BGAS) are obtained by reference to the triaxial electrospinning technology. The as-prepared spheres possess the controllable integrated conductive networks, leading to the effective dielectric loss and impedance matching, thus bringing on high-performance microwave absorption. The as-obtained HGAS shows a minimum reflection loss of -52.7 dB, and a broad effective absorption bandwidth (fE) of 7.0 GHz with thickness of 2.3 mm. Further, the fE reaches 9.3 GHz for BGAS with thickness of 3.4 mm. Aforementioned superior microwave absorption of HGAS and BGAS confirms combination of multiaxial electrospinning and freeze-drying on the multiscale is an effective strategy for scalable fabrication of advanced microwave absorbing functional graphene aerogel spheres.

Keywords

multiaxial electrospinninghollow graphene aerogel sphereshierarchical porous structureselectromagnetic performance

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Nano Research
Volume 13 Issue 2,
February 2020
Pages 477-484
DOI: 10.1007/s12274-020-2632-0
Cite this article:
Li T, Zhi D, Chen Y, et al. Multiaxial electrospun generation of hollow graphene aerogel spheres for broadband high-performance microwave absorption. Nano Research, 2020, 13(2): 477-484. https://doi.org/10.1007/s12274-020-2632-0
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