Abstract
The swift advancement of electronics technology has led to a burgeoning interest in multifunctionaliz-ing electromagnetic wave(EMW)absorption materials as a prospective avenue for future development.However,the effective integration of diverse functions within a single material continues to present chal-lenges.This work successfully fabricated a three-dimensional(3D)porous Co6Mo6C2/Mo2C@NC frame-work with carbon microspheres through uncomplicated freeze-drying and high-temperature pyrolysis techniques.The resultant magnetic bimetallic carbide(Co6Mo6C2 and Mo2C)nanoparticles are uniformly and densely embedded within the carbon layer,facilitated jointly by a rigid template(molybdenum salt)and a flexible template(glucose),thus realizing an exceptional dual loss mechanism involving dielectric and magnetic components.The establishment of the 3D porous conductive network enhances EMW ab-sorption through multiple reflections and scattering mechanisms.Impressively,the Co6Mo6C2/Mo2C@NC framework attains remarkable EMW absorption characteristics with ultralightweight(0.1567 g cm-3),ul-trathin matching thickness(1.7 mm),and robust absorption(reflection loss RL value of-65.89 dB).Fur-thermore,it achieves a noteworthy effective absorption bandwidth(EAB,RL ≤-10 dB)spanning 6.4 GHz,ensuring complete absorption of 100％within the X band(8-12 GHz)at a matching thickness of 2 mm.In addition,the Co6Mo6C2/Mo2C@NC framework exhibits pronounced hydrophobicity and magnetic respon-siveness,bestowing upon it appealing attributes including self-cleaning,flame retardancy,and thermal insulation,on par with those observed in commercial products.The radar cross-sectional area(RSC)re-duction value of the Co6Mo6C2/Mo2C@NC framework can reach 35.2 dB m2 by RSC simulation,which can effectively lower the likelihood of detection by radar detectors for the target.This study presents a viable strategy for the advancement of novel lightweight and multifunctional materials that demonstrate exceptional performance in absorbing electromagnetic waves.
基金项目
National Natural Science Foundation of China(22269010)
Jiangxi Provincial Natural science Foundation(20224BAB214021)
Training Program for Academic and Technical Leaders of Major Disciplines in Jiangxi Province(20212BCJ23020)
Science and Technology Project of Jiangxi Provincial Department of Education(GJJ211305)
Opening Project of National Engineering Research Center for Domestic & Building Ceramics(GXZX2302)
Graduate Innovation Fund of Jiangxi Province(YC2023-S799)
NETL
NSTL
万方数据