Dual template-derived 3D porous Co6Mo6C2/Mo2C@NC framework for electromagnetic wave response and multifunctional applications  

作　　者：Ya Ning Xiaojun Zeng Xiawen Peng Xiao Jiang Zong-Yang Shen Chongbo Liu Ronghai Yu 

机构地区：[1]National Engineering Research Center for Domestic&Building Ceramics,School of Materials Science and Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,China [2]School of Environmental and Chemical Engineering,Nanchang Hangkong University,Nanchang 330063,China [3]School of Materials Science and Engineering,Beihang University,Beijing 100191,China

出　　处：《Journal of Materials Science & Technology》2024年第20期15-27,共13页材料科学技术（英文版）

基　　金：This work was supported by the National Natural Science Foun-dation of China(No.22269010);the Jiangxi Provincial Natural Sci-ence Foundation(No.20224BAB214021);the Training Program for Academic and Technical Leaders of Major Disciplines in Jiangxi Province(No.20212BCJ23020);the Science and Technology Project of Jiangxi Provincial Department of Education(No.GJJ211305);the Opening Project of National Engineering Research Center for Do-mestic&Building Ceramics(No.GXZX2302);the Graduate In-novation Fund of Jiangxi Province(YC2023-S799).

摘　　要：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 Co_(6)Mo_(6)C_(2)/Mo_(2)C@NC frame-work with carbon microspheres through uncomplicated freeze-drying and high-temperature pyrolysis techniques.The resultant magnetic bimetallic carbide(Co_(6)Mo_(6)C_(2) and Mo_(2)C)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 Co_(6)Mo_(6)C_(2)/Mo_(2)C@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 R_(L) value of-65.89 dB).Fur-thermore,it achieves a noteworthy effective absorption bandwidth(EAB,R_(L)≤-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 Co_(6)Mo_(6)C_(2)/Mo_(2)C@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 Co_(6)Mo_(6)C_(2)/Mo_(2)C@NC framework can reach 35.2 dB m^(2) 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 dem

关 键 词：Dual template Wide broadband Electromagnetic wave absorption Multifunctionalisation Flame retardant 

分 类 号：TB34[一般工业技术—材料科学与工程]