Facile synthesis of cobalt-zinc ferrite microspheres decorated nitrogen-doped multi-walled carbon nanotubes hybrid composites with excellent microwave absorption in the X-band
Facile synthesis of cobalt-zinc ferrite microspheres decorated nitrogen-doped multi-walled carbon nanotubes hybrid composites with excellent microwave absorption in the X-band
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DOI：
10.1016/j.compscitech.2019.107839
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发表时间：
2019-11-10
影响因子：
9.1
通讯作者：
Zheng, Mingdong
中科院分区：
文献类型：
--
作者：
Shu, Ruiwen;Wu, Yue;Zheng, Mingdong
本文采用简单的一步溶剂热法合成了氮掺杂多壁碳纳米管/钴锌铁氧体（NMWCNTs/Co0.5Zn0.5Fe2O4）杂化复合材料。形貌观察结果表明，Co0.5Zn0.5Fe2O4微球均匀负载在NMWCNTs表面，并通过NMWCNTs在混杂复合材料中缠结形成原位三维导电网络。此外，还研究了NMWCNTs含量对NMWCNTs /Co0.5Zn0.5Fe2O4/石蜡复合材料电磁参数和微波吸收性能的影响。结果表明，复合材料在x波段具有较好的微波吸收性能。值得注意的是，当匹配厚度为3.1 mm时，最小反射损耗达到-64.7 dB，而当匹配厚度仅为2.1 mm时，有效吸收带宽达到4.3 GHz （11.7-16.0 GHz）。复合材料具有双频（C波段和Ku波段）的微波吸收特性。此外，通过改变NMWCNTs的匹配厚度和含量，可以很容易地调节复合材料的微波吸收性能。所获得的杂化复合材料优异的微波吸收性能主要来源于磁损耗、导损耗和介电损耗的协同作用以及优化的阻抗匹配。本文的研究结果对三维mwcnts基复合材料的结构设计和制备具有一定的指导意义。
Herein, nitrogen-doped multi-walled carbon nanotubes/cobalt-zinc ferrite (NMWCNTs/Co0.5Zn0.5Fe2O4) hybrid composites were synthesized through a facile one-step solvothermal route. Results of morphology observations revealed that Co0.5Zn0.5Fe2O4 microspheres were uniformly loaded on the surface of NMWCNTs and three-dimensional (3D) conductive networks were in-situ constructed by the entanglement of NMWCNTs in the as-prepared hybrid composites. Moreover, the influence of contents of NMWCNTs on the electromagnetic parameters and microwave absorption properties of NmwcNTs/Co0.5Zn0.5Fe2O4/paraffin wax composites were elaborately investigated. It was found that the obtained hybrid composites demonstrated superior microwave absorption performance in the X-band. Remarkably, the minimum reflection loss reached -64.7 dB with a matching thickness of 3.1 mm and effective absorption bandwidth achieved 4.3 GHz (11.7-16.0 GHz) with a thickness of merely 2.1 mm. Furthermore, a dual-band (C and Ku bands) microwave absorption characteristic was observed in the obtained hybrid composites. Besides, the microwave absorption properties of as-prepared hybrid composites could be facilely tuned by changing the matching thicknesses and contents of NMWCNTs. The superior microwave absorption properties of obtained hybrid composites mainly originated from the synergistic effects of magnetic loss, conduction loss and dielectric loss, and optimized impedance matching. It was believed that our results could be helpful for the structural design and facile fabrication of 3D MWCNTs-based hybrid composites as high-efficient microwave absorbers.