Coprecipitation synthesis of hollow poly(acrylonitrile) microspheres@CoFe2O4 with graphene as lightweight microwave absorber

• Published in: Journal of materials science. Materials in electronics 2017-02, Vol.28 (4), p.3337-3348
• Main Authors: Zhang, Bin, Wang, Jun, Wang, Junpeng, Duan, Huajun, Huo, Siqi, Tang, Yushan
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Materials Science; Optical and Electronic Materials
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-016-5927-x

Lightweight microwave absorbing material based on CoFe 2 O 4 -coated poly(acrylonitrile) microspheres (PANS@CF), reduced graphene oxide (RGO) and epoxy resin was prepared by a facile route. Compared with pure PANS@CF and RGO composites, the −10 dB absorption bandwidth and the minimum R L of the hybrid composites were enhanced. The bandwidth less than −10 dB was almost 3.6 GHz in the range of 12–15.6 GHz, with a matching thickness of 2 mm. A possible absorption mechanism was proposed that the enhanced impedance matching condition improved by the combination of dielectric materials and magnetic microspheres, and the enhanced electromagnetic wave attenuation characteristic due to the increased propagation paths by multiple reflections, both promoted the absorption performance of the composites. The content of magnetic nanoparticles in hollow magnetic spheres was about 81.73 wt%, and the density of the hybrid composites was in the range of 0.41–0.50 g/cm 3 , which makes the composites have a promising future in lightweight microwave absorbing materials.