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Biomass-derived carbon heterostructure composites modified with magnetic iron oxide for excellent EMW-absorbing materials

文献类型： 外文期刊

作者： Song, Daihao 1 ; Wang, Qiuyi 1 ; Han, He 1 ; Lou, Zhichao 1 ; Li, Yanjun 1 ;

作者机构： 1.Nanjing Forestry Univ, Coll Mat Sci & Engn, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat Fo, Nanjing 210037, Peoples R China

2.Jiangsu Acad Agr Sci, Key Lab Protected Agr Engn Middle & Lower Reaches, Minist Agr & Rural Affairs, Nanjing 210014, Jiangsu, Peoples R China

关键词： EMW absorption; Biomass; Pyrolysis; Heterostructure; Composites

期刊名称：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS （ 影响因子：4.9； 五年影响因子：4.7 ）

ISSN： 0927-7757

年卷期： 2024 年 697 卷

页码：

收录情况： SCI

摘要： With the gradual spread of satellite navigation, broadcasting, and communication technologies, the problem of electromagnetic pollution in C- and Ku-band has increased. Electromagnetic wave (EMW) absorbing materials can effectively mitigate this problem. Here, we report the design of a biomass carbon heterostructure for the absorption of EMWs. This design takes advantage of the natural fiber mesh structure of the loofah and the voids, veins, and basal tissues surrounding the fibers. The material is then carbonized to create a radar antenna-like structure of fibers and nanosheets. This improves the material's conductive loss. In addition, modification with magnetic iron oxide in loofah sponges improves the impedance matching of the materials, enhances the magnetic loss, and increases the heterogeneous interface. We found that the maximum effective absorption frequency range of the prepared EMW-absorbing materials is 3.80 GHz, which is mainly concentrated in the C band and Ku -band, and its maximum | RL min | value is -59.20 dB. The material's ability to absorb EMWs was also verified by simulating the radar cross section (RCS). In conclusion, this work develops a green and efficient composite material for absorbing EMWs and provides new design ideas for the development of EMW-absorbing materials.

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