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Fe3O4-decorated single-walled carbon nanohorns with extraordinary microwave absorption property

机译：具有出色的微波吸收性能的Fe3O4装饰的单壁碳纳米角

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摘要

Single-walled carbon nanohorns (SWCNHs) are seldom used as electromagnetic (EM) wave absorption materials due to their inferior impedance matching resulting from their high dielectric constant. In this work, decorated with 35.6 wt% Fe3O4 nanoparticles, the as-prepared composite displays a significantly enhanced EM wave absorption ability because of the improved impedance matching, electric polarization and interfacial polarization. Specifically, the maximum reflection loss of this composite with a thickness of 5.8 mm is -38.84 dB at 3.72 GHz in the S-band. The bandwidth of absorption exceeding -10 dB is 9.2 GHz (from 3.2 GHz to 12.4 GHz) with an absorber thickness of 2-6 mm. What is more, a second absorption peak with a reflection loss no less than -10 dB appears when the absorber thickness is over 4 mm.
机译：单壁碳纳米角（SWCNHs）由于其高介电常数而导致的较差的阻抗匹配，因此很少用作电磁（EM）吸波材料。在这项工作中，用35.6 wt％的Fe3O4纳米颗粒装饰，由于改善了阻抗匹配，电极化和界面极化，因此制备的复合材料显示出显着增强的EM波吸收能力。具体地说，这种厚度为5.8 mm的复合材料在S波段的3.72 GHz处的最大反射损耗为-38.84 dB。超过-10 dB的吸收带宽为9.2 GHz（从3.2 GHz到12.4 GHz），吸收层厚度为2-6 mm。此外，当吸收体的厚度超过4 mm时，会出现反射损耗不小于-10 dB的第二吸收峰。

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