Multiscale structure and interface engineering of Fe/Fe_(3)C in situ encapsulated in nitrogen-doped carbon for stable and efficient multi-band electromagnetic wave absorption  

作　　者：Bo Jiang Wang Yang Hengxuan Bai Chen Zhang Siyuan Li Shaoxiong Du Ye Wang Li Sun Xiaobai Wang Yongfeng Li 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,China University of Petroleum(Beijing),Changping 102249,China [2]Department of Materials Application Research,AVIC Manufacturing Technology Institute,Beijing 100024,China

出　　处：《Journal of Materials Science & Technology》2023年第27期9-20,共12页材料科学技术（英文版）

基　　金：financially supported by the National Natu-ral Science Foundation of China(Grant Nos.22178384,22238012 and 52002363);the Science Foundation of China University of Petroleum,Beijing(Grant No.ZX20220079);the Aeronautical Science Foundation of China(Grant No.2020Z054025002).

摘　　要：Most reported electromagnetic wave absorption(EWA)materials show significant effective absorption in a certain frequency range,but their performances deteriorate dramatically as the frequency changes.As the range of working frequencies for electronic devices is gradually widening,it is of great interest to explore frequency-insensitive EWA materials that can achieve efficient absorption in every waveband by simply changing the absorption thickness.To this end,a multi-scale absorber(Fe/Fe_(3) C@NC)is rationally synthesized by chemical foaming and in-situ growth strategy.By controlling the growth of carbon nan-otubes,the Fe/Fe_(3) C@NC-2 exhibits a well-constructed 3D multi-scale architecture.Thanks to dipole po-larization,interface polarization and magnetic-dielectric energy conversion,the Fe/Fe_(3) C@NC-2 overcomes the frequency dispersion behavior and keeps a stable dielectric attenuation capability across the entire frequency range.Consequently,it delivers a superb full-band absorption of-50.1,-59.83,-55.87 and-51.91 dB in the S,C,X and Ku bands,respectively.The maximum radar cross-sectional reduction reaches 35.44 dB m^(-2) when the incidentθis 20°,testifying its impressive performance.Surprisingly,this EWA material also shows a remarkable resistance to oxidation and corrosion derived from the tightly coated carbon layers.This work provides new insight into the design of multi-band and stable EWA materials for practical application.

关 键 词：Multi-scale structure Heterogeneous interface Multiple bands Magnetic-dielectric composites Electromagnetic waves absorption 

分 类 号：TB332[一般工业技术—材料科学与工程]