@article{Meng2018, 
author = {Fanbin Meng and Huagao Wang and  Wei and Zijian Chen and Tian Li and Chunyuan Li and Yu Xuan and Zuowan Zhou},
title = {Generation of graphene-based aerogel microspheres for broadband and tunable high-performance microwave absorption by electrospinning-freeze drying process},
year = {2018},
journal = {Nano Research},
volume = {11},
number = {5},
pages = {2847-2861},
keywords = {impedance matching, electromagnetic wave absorption, electrospun, graphene-based aerogel microspheres, ultralow loading content},
url = {https://www.sciopen.com/article/10.1007/s12274-017-1915-6},
doi = {10.1007/s12274-017-1915-6},
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.}
}