Tailored design and fabrication of microwave absorption materials is of great importance to the development of electromagnetic technology. In the present work, we report a facile solvothermal method to construct Fe₃O₄/reduced graphene oxide (rGO) composites with adjustable morphologies and components. The effect of rGO content on the Fe₃O₄ morphology is investigated and it is found that the morphology of Fe₃O₄ varies from self-assembled solid/flower-like structure to monodisperse nanoparticles with the increase of rGO content. Impressively, the corresponding microwave absorption performance of the Fe₃O₄/rGO composites is remarkably improved due to the synergistic electric and magnetic effect between rGO and Fe₃O₄. Specifically, when the amount of GO is 10 wt. %, the as-prepared Fe₃O₄/rGO composite shows a minimum reflection loss of −64.7 dB at 6.6 GHz with an absorber thickness of 4.5 mm and a broad effective absorption bandwidth of 13.6 GHz with the thickness of 1.5–5 mm. Our result shows that an appropriate amount of rGO can achieve matched impedance matching value resulting in the enhancement of electromagnetic absorption.

Graphic abstract

中文翻译：

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Fe3O4 纳米结构在还原氧化石墨烯上的合理自组装以增强微波吸收

微波吸收材料的定制设计和制造对电磁技术的发展具有重要意义。在目前的工作中，我们报告了一种简便的溶剂热方法来构建具有可调形态和成分的Fe ₃ O ₄ /还原氧化石墨烯 (rGO) 复合材料。在铁RGO含量的效果₃ ö ₄形态学进行了研究并发现Fe的形态₃ ø _4个从因人而异自组装固/花状结构单分散的纳米颗粒与RGO含量的增加。令人印象深刻的是，Fe ₃ O ₄的相应微波吸收性能由于rGO和Fe ₃ O ₄之间的协同电磁效应，/rGO复合材料得到显着改善。具体而言，当 GO 的量为 10重量％时。%，所制备的 Fe ₃ O ₄ /rGO 复合材料在 6.6 GHz 处的最小反射损耗为 -64.7 dB，吸收体厚度为 4.5 mm，有效吸收带宽为 13.6 GHz，厚度为 1.5-5 mm。我们的结果表明，适量的 rGO 可以实现匹配的阻抗匹配值，从而增强电磁吸收。

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