We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Generation of graphene-based aerogel microspheres for broadband and tunable high-performance microwave absorption by electrospinning-freeze drying process.
- Authors
Meng, Fanbin; Wang, Huagao; Wei; Chen, Zijian; Li, Tian; Li, Chunyuan; Xuan, Yu; Zhou, Zuowan
- 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 (<italic>R</italic>L < −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.<graphic></graphic>
- Publication
Nano Research, 2018, Vol 11, Issue 5, p2847
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-017-1915-6