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Controllable permittivity in 3D Fe3O4/CNTs network for remarkable microwave absorption performances

机译:3D FE3O4 / CNTS网络中可控介电常数,用于显着的微波吸收性能

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摘要

Carbon-based magnetic composites are promising alternatives to pure magnetic nanoparticles (MOx, M - Fe, Co, Ni) and spinel ferrites (MFe2O4, M - Fe, Co, Ni, Mn, Zn) as electromagnetic (EM) wave absorption materials, which however suffer from complex processes and have poor microwave absorption properties. Herein, we anchored Fe3O4 porous spheres onto carbon nanotubes (CNTs) via a simple solvothermal method. The formed Fe3O4/CNTs nanocomposites show a three-dimension (3D) network. The improved effective bandwidth (3.9 GHz) and, more importantly, remarkable EM microwave absorption performances (-51 dB at 5.52 GHz) are observed in 3D Fe3O4/5 wt% CNTs nanocomposites. The enhanced microwave absorption performances are attributed to the high surface areas and porous structure of magnetic Fe3O4 spheres, which presented a good synergetic role with CNTs. Furthermore, the controllable permittivity in nanocomposites was developed by adjusting the CNT content, which balanced the permeability to obtain a good impedance matching. This work demonstrates a simple approach to enhancing the microwave absorption performances of EM wave absorption materials.
机译:基于碳的磁性复合材料是有希望的替代纯的磁性纳米粒子(MOX,男 - 铁,钴,镍)和尖晶石铁氧体 - 如电磁(EM)波的吸收材料(MFe2O4,男铁,钴,镍,锰,锌),然而其从复杂的过程遭受并且具有差的微波的吸收性能。在此,我们通过简单的溶剂热法的Fe3O4锚定孔球到碳纳米管(CNT)。所形成的四氧化三铁/碳纳米管纳米复合材料显示了三维(3D)网络。改进的有效带宽(3.9千兆赫)和,更重要的是,显着的EM微波吸收性能(-51分贝在5.52千兆赫)在3D的Fe3O4 / 5重量%的CNT纳米复合材料中观察到。增强的微波吸收性能归因于高表面积和四氧化三铁磁性球,其中提出的CNT良好的协同作用的多孔结构。此外,在纳米复合材料的可控电容率通过调节CNT含量,其中平衡的渗透性,以获得良好的阻抗匹配显影。这项工作演示了一个简单的方法来提高的电磁波吸收材料的微波吸收性能。

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  • 来源
    《RSC Advances》 |2017年第43期|共8页
  • 作者单位

    Beihang Univ Sch Mat Sci &

    Engn Beijing 100191 Peoples R China;

    Beihang Univ Sch Mat Sci &

    Engn Beijing 100191 Peoples R China;

    Beihang Univ Sch Mat Sci &

    Engn Beijing 100191 Peoples R China;

    Beihang Univ Sch Mat Sci &

    Engn Beijing 100191 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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