材料科学
反射损耗
微波食品加热
石墨烯
复合数
吸收(声学)
化学工程
阻抗匹配
热液循环
微观结构
介电常数
复合材料
氧化物
光电子学
纳米技术
电介质
电阻抗
工程类
物理
电气工程
冶金
量子力学
作者
Mingliang Ma,Wenting Li,Zhouyu Tong,Yuying Yang,Yong Ma,Zhonghe Cui,Rongzhen Wang,Ping Lyu,Weibo Huang
标识
DOI:10.1016/j.matdes.2019.108462
摘要
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.
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