With the increased electromagnetic wave(EMW)threat to military and human health,the develop-ment of EMW-absorbing materials is crucial.Metal-organic framework derivatives containing magnetic nanoparticles and a carbon matrix are potential candidates for designing efficient EMW-absorbing mate-rials.Herein,a zeolitic imidazolate framework-67(ZIF-67)-embedded three-dimensional melamine foam is pyrolyzed to afford carbon foam-based nitrogen-doped carbon nanotube composites,named 3D foam-like CoO/Co/N-CNTs.Magnetic CoO/Co particles are confined in the dielectric carbon nanotube skeleton.The carbon nanotubes provide considerable conductive loss,while CoO/Co magnetic particles are con-ducive to providing magnetic loss and adjusting impedance matching.Moreover,the numerous defect structures introduced by heteroatomic doping(nitrogen)cause dipole polarization and simultaneously adjust impedance matching.Meanwhile,the unique porous nanotube structure promotes multiple re-flections and scattering of EMWs,further optimizing impedance matching.CoO/Co/N-CNTs composites exhibit a minimum reflection loss of-52.3 dB at a matching thickness of 2.0 mm,while the correspond-ing effective absorption bandwidth is 5.28 GHz at a matching thickness of 2.2 mm.This study reports a novel approach to fabricating a lightweight high-performance EMW-absorbing material.
Lightweight porous carbon materialsCarbon nanotubesCoO/Co magnetic particlesElectromagnetic synergistic effectImpedance matching
MOE Key Lab of Materials Physics and Chemistry in Extraordinary Conditions,Shaanxi Key Laboratory of Macromolecular Science and Technology,School of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi'an 710072,China
Key laboratory of Flexible Electronics of Zhejiang Province,Ningbo Institute of Northwestern Polytechnical University,Ningbo 315103,China
Polymer Materials and Engineering Department,School of Materials Science and Engineering,Chang'an University,Xi'an 710064,China
国家重点研发计划国家自然科学基金Foundation of Aeronautics Science FundNatural Science Basic Research Program of Shaanxi Province中央高校基本科研业务费专项中国博士后科学基金Polymer Electromagnetic Functional Materials Innovation Team of Shaanxi Sanqin Scholars
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