Journal
NANO RESEARCH
Volume 11, Issue 5, Pages 2847-2861Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1915-6
Keywords
electrospun; graphene-based aerogel microspheres; electromagnetic wave absorption; impedance matching; ultralow loading content
Categories
Funding
- National Natural Science Foundation of China [51573149]
- Science and Technology Planning Project of Sichuan Province [2016GZ0224]
- Fundamental Research Funds for the Central Universities [2682016CX069]
- Student Research Training Program [2017005]
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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 (R-L < -10 dB) of 6.5 GHz. Furthermore, switching to coaxial electrospinning enables the fabrication of SiO2 coatings to construct graphene/Fe3O4@SiO2 coreaEuro'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.
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