Flexible ultra-thin Fe3O4/MnO2 core-shell decorated CNT composite with enhanced electromagnetic wave absorption performance
Flexible ultra-thin Fe3O4/MnO2 core-shell decorated CNT composite with enhanced electromagnetic wave absorption performance
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DOI：
10.1016/j.compositesb.2018.02.015
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发表时间：
2018-07
期刊：
影响因子：
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通讯作者：
Yiqin Shao;Weibang Lu;Hang Chen;J. Xiao;Y. Qiu;T. Chou
中科院分区：
文献类型：
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作者：
Yiqin Shao;Weibang Lu;Hang Chen;J. Xiao;Y. Qiu;T. Chou
高反射损耗、宽带宽和低密度是电磁波吸收材料的理想属性。本文采用溶剂热沉积和电化学沉积两步合成了MnO 2/Fe 3 O 4/碳纳米管超薄薄膜。Fe 3 O 4纳米粒子和MnO 2片层在碳纳米管薄膜表面形成纳米级的核壳结构。成功地合成了一系列具有不同壳层结构和MnO 2质量比的这种分级复合膜。其独特的微结构大大提高了复合材料的电磁波吸收能力。磁滞回线证实了内禀铁磁性。介电损耗、磁滞损耗和多重散射之间的强耦合导致反射损耗高达-42.2 dB，带宽为7.1 GHz，对于1 mm厚的柔性复合膜，MnO 2重量比为10%。
High reflection loss, wide bandwidth and low density are desirable attributes of electromagnetic wave absorption materials. Here, an ultra-thin MnO2/Fe3O4/carbon nanotube film has been synthesized in two steps using solvothermal deposition and electrochemical deposition. The Fe3O4nanoparticles and the MnO2sheets form a nano-scale core-shell structure on the surface of the carbon nanotube film. A series of this hierarchical composite film with different shell structures and MnO2 weight ratios were successfully synthesized. Their unique micro-structure greatly enhances the electromagnetic wave absorption capability of the composites. Instrinsic ferromagnetism is confirmed by the magnetic hysteresis loops. The strong couplings among dielectric loss, hysteresis loss and multiple scattering resulted in the reflection loss up to −42.2 dB with the bandwidth of 7.1 GHz at 10% MnO2weight ratio for a flexible composite film of 1 mm thick.