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

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• 作者：Bin Zhang ; Jun Wang ; Junpeng Wang…
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：28
• 期：4
• 页码：3337-3348
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1573-482X
• 卷排序：28

文摘

Lightweight microwave absorbing material based on CoFe₂O₄-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/cm3, which makes the composites have a promising future in lightweight microwave absorbing materials.