Abstract One-dimensional (1D) microwave absorbing materials (MAMs) can induce self-assembly of graphene into aerogels, which provides ideas for the preparation of new MAMs. In here, 3D flower-like Fe3O4@SiO2@MnO2@reduced graphene oxide (RGO) (FSMG) composite aerogels have been fabricated via hydrothermal method, in which 1D Fe3O4@SiO2 (FS) nanochains and two-dimensional (2D) MnO2 sheets form a nano-scale core-shell structure on the surface of the RGO nanosheets. The unique microstructure of aerogels greatly enhances the microwave absorption capability. Particularly, the addition of RGO regulates the complex permittivity and improves the impedance matching of 1D Fe3O4@SiO2@MnO2 (FSM) nanochains. Results demonstrate that the well-designed 3D conductive networks with significant oxygen vacancy defects powerfully favor the electromagnetic wave (EMW) absorption. The as-prepared FSMG composite aerogels show efficient microwave absorption (MA) properties with the maximum effective absorption bandwidth (EAB) of 4.26 GHz (7.13–11.39 GHz) at the corresponding coating thickness of 3.2 mm, accompanied by the minimum reflection loss (RLmin) of about −55.01 dB. This work indicates that the FSMG composite aerogels are excellent absorbers with wide bandwidth, strong absorption, thin thickness and light weight, which can become a hopeful candidate in the field of MA.

中文翻译：

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一维花状Fe3O4@SiO2@MnO2纳米链诱导RGO自组装成气凝胶以实现高效微波吸收

摘要 一维（1D）微波吸收材料（MAMs）可以诱导石墨烯自组装成气凝胶，这为制备新型MAMs提供了思路。在这里，通过水热法制备了 3D 花状 Fe3O4@SiO2@MnO2@还原氧化石墨烯 (RGO) (FSMG) 复合气凝胶，其中 1D Fe3O4@SiO2 (FS) 纳米链和二维 (2D) MnO2 片在 RGO 纳米片表面形成纳米级核壳结构。气凝胶独特的微观结构大大增强了微波吸收能力。特别是，RGO 的加入调节了复介电常数并改善了 1D Fe3O4@SiO2@MnO2 (FSM) 纳米链的阻抗匹配。结果表明，精心设计的具有显着氧空位缺陷的 3D 导电网络有力地有利于电磁波 (EMW) 吸收。所制备的 FSMG 复合气凝胶在相应的 3.2 mm 涂层厚度下显示出有效的微波吸收 (MA) 特性，最大有效吸收带宽 (EAB) 为 4.26 GHz (7.13-11.39 GHz)，同时具有最小反射损耗 (RLmin) ) 约为 -55.01 dB。该工作表明FSMG复合气凝胶是一种优良的吸收剂，具有带宽宽、吸收强、厚度薄、重量轻等特点，有望成为MA领域的一个有希望的候选者。39 GHz），相应的涂层厚度为 3.2 mm，伴随着约 -55.01 dB 的最小反射损耗 (RLmin)。该工作表明FSMG复合气凝胶是一种优良的吸收剂，具有带宽宽、吸收强、厚度薄、重量轻等特点，有望成为MA领域的一个有希望的候选者。39 GHz），相应的涂层厚度为 3.2 mm，伴随着约 -55.01 dB 的最小反射损耗 (RLmin)。该工作表明FSMG复合气凝胶是一种优良的吸收剂，具有带宽宽、吸收强、厚度薄、重量轻等特点，有望成为MA领域的一个有希望的候选者。