具有三明治结构的MXene/聚酰亚胺复合泡沫用于多尺度微波吸收  

Sandwiched MXene/polyimide composite foams for multiscale microwave absorption

作　　者：张亚君 韩美康 胡荣祥 张培根 潘龙 孙正明 Yajun Zhang;Meikang Han;Rongxiang Hu;Peigen Zhang;Long Pan;ZhengMing Sun(Key Laboratory of Advanced Metallic Materials of Jiangsu Province,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;Institute of Optoelectronics and Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception,Fudan University,Shanghai 200433,China)

机构地区：[1]Key Laboratory of Advanced Metallic Materials of Jiangsu Province,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China [2]Institute of Optoelectronics and Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception,Fudan University,Shanghai 200433,China

出　　处：《Science China Materials》2024年第1期272-278,共7页中国科学（材料科学）（英文版）

基　　金：supported by the National Natural Science Foundation of China (52201242);the Natural Science Foundation of Jiangsu Province (BK20200386);the Young Elite Scientists Sponsorship Program by CAST (2021QNRC001)。

摘　　要：三维多孔结构可促进电磁波在材料内部的多重反射,是提升微波吸收性能的有效方法.然而,传统的三维多孔结构中,多重反射仅发生在孔内.扩大多重反射的范围应能进一步提升材料的吸收性能.因此,本文开发了一种孔壁为三明治结构的三维多孔复合泡沫,在亚毫米尺度孔和亚微米尺度孔壁中同时发生多重反射,实现多尺度微波吸收.本研究采用聚多巴胺修饰的聚酰亚胺泡沫(PDA@PIF)作为三维多孔骨架,在其孔壁表面负载Ti_(3)C_(2)T_(x).所得的Ti_(3)C_(2)T_(x)@PDA@PIF能够在整个X波段吸收超过90%的入射波.这得益于多尺度多重反射、电导损耗和界面极化.同时,该复合泡沫具有优异的柔性和低密度(~30 mg cm^(-3)).该工作为实现轻质、柔性、宽频的吸波材料提供了一种可行的方法,丰富了电磁防护的有效结构.Constructing three-dimensional(3D)porous structures is an effective method to improve microwave ab-sorbing performance due to the multiple reflections.However,in traditional 3D porous structures,multiple reflections only occur within the pores.Promoting multiple reflections beyond the pores should further improve the absorbing performance.Herein,a 3D porous composite foam with sandwiched cell walls was developed to boost multiple reflections in both the submillimeter-scale pores and the submicron-scale cell walls,achieving multiscale microwave absorption.Polydopamine(PDA)-modified polyimide foam(PIF)was used as the 3D porous skeleton.The cell walls of the PDA@PIF were sand-wiched by Ti_(3)C_(2)T_(x)MXene.The resulting Ti_(3)C_(2)T_(x)@PDA@PIF can absorb over 90%of the incident microwave over the whole X band,which is contributed by multiscale multiple reflec-tions,conduction loss,and interfacial polarization.Mean-while,the composite foam exhibits excellent flexibility and a low density of~30 mg cm^(-3).This work offers a realistic ap-proach for lightweight,flexible,and broadband microwave absorbers,enriching the structures for effective electro-magnetic protection.

关 键 词：三明治结构 聚酰亚胺泡沫 多重反射 微米尺度 微波吸收 复合泡沫 电磁防护 吸收性能 

分 类 号：TB34[一般工业技术—材料科学与工程]