Fe3C包覆氮掺杂碳纳米管/香蒲衍生碳微米管复合材料及其高效微波吸收性能OA

Due to the inherent limited dielectric loss of carbon ma-terials,their attenuation ability and impedance matching are often unsatisfactory.To overcome these problems,hierarchical structures and combined microwave loss mechanisms have attracted consider-able attention in the development of high performance microwave absorbers.In this work,biomass cattail was used as a sustainable precursor to synthesize nitrogen-doped carbon nanotube arrays dec-orated with Fe3C nanoparticles by chemical vapor deposition.The resulting cattail-derived carbon-based tubular composites(Fe3C@NCNTs/CMTs)feature a unique Fe3C-coated,nitrogen-doped carbon nanotube structure.The influence of crystallinity,tuned by calcination at different temperatures,on microwave absorption was investigated.Remarkably,at 800 ℃,Fe3C@NCNTs/CMTs achieved a minimum reflection loss of-35.8 dB and an effective absorption bandwidth of 7.02 GHz at a thickness of only 1.7 mm,even at an ultralow filler loading of 10%,effectively covering the entire Ku band and part of the X band.The excellent microwave absorption performance is attributed to the combined contribution of increased magnetic loss and multiple dielectric polarization mechanisms.This study shows a promising strategy for designing biomass-derived carbon-based broadband microwave absorbing materials.