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Research Article

Generation of graphene-based aerogel microspheres for broadband and tunable high-performance microwave absorption by electrospinning-freeze drying process

Fanbin Meng, Huagao Wang,  Wei, Zijian Chen, Tian Li, Chunyuan Li, Yu Xuan, Zuowan Zhou( )
Key Laboratory of Advanced Technologies of Materials (Ministry of Education)School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu610031China
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An erratum to this article is available online at:
https://doi.org/10.1007/s12274-017-1949-9

Graphical Abstract

Abstract

Despite recent progress in the synthesis and application of graphene-based aerogels, some challenges such as scalable and cost-effective production, and miniaturization still remain, which hinder the practical application of these materials. Here we report a large-scale electrospinning method to generate graphene-based aerogel microspheres (AMs), which show broadband, tunable and high-performance microwave absorption. Graphene/Fe3O4 AMs with a large number of openings with hierarchical connecting radial microchannels can be obtained via electrospinning-freeze drying followed by calcination. Importantly, for a given Fe3O4: graphene mass ratio, altering the shape of aerogel monoliths or powders into aerogel microspheres leads to unique electromagnetic wave properties. As expected, the reflection loss of graphene/Fe3O4 AMs-1:1 with only 5 wt.% absorber loading reaches?51.5 dB at 9.2 GHz with a thickness of 4.0 mm and a broad absorption bandwidth (RL < -10 dB) of 6.5 GHz. Furthermore, switching to coaxial electrospinning enables the fabrication of SiO2 coatings to construct graphene/Fe3O4@SiO2 core?shell AMs. The coatings influence the electromagnetic wave absorption of graphene/Fe3O4 AMs significantly. In view of these advantages, we believe that this processing technique may be extended to fabricate a wide range of unique graphene-based architectures for functional design and applications.

Keywords

impedance matchingelectromagnetic wave absorptionelectrospungraphene-based aerogel microspheresultralow loading content

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Nano Research
Volume 11 Issue 5,
May 2018
Pages 2847-2861
DOI: 10.1007/s12274-017-1915-6
Cite this article:
Meng F, Wang H, Wei, et al. Generation of graphene-based aerogel microspheres for broadband and tunable high-performance microwave absorption by electrospinning-freeze drying process. Nano Research, 2018, 11(5): 2847-2861. https://doi.org/10.1007/s12274-017-1915-6

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Received: 29 August 2017
Revised: 04 November 2017
Accepted: 07 November 2017
Published: 12 May 2018
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2017
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