超细纤维素纳米晶增强MXene仿生复合材料的多功能电磁屏蔽性能  

Ultrafine cellulose nanocrystal-reinforced MXene biomimetic composites for multifunctional electromagnetic interference shielding

作　　者：吴娜 李宾 潘飞 张如娜 刘久荣 曾志辉 Na Wu;Bin Li;Fei Pan;Runa Zhang;Jiurong Liu;Zhihui Zeng(Department of Chemistry and Applied Biosciences,ETH Zurich,CH-8093 Zurich,Switzerland;Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials,Ministry of Education and School of Materials Science and Engineering,Shandong University,Jinan 250061,China;Department of Chemistry,University of Basel,Mattenstrasse 24a,BPR 1096,Basel,Switzerland)

机构地区：[1]Department of Chemistry and Applied Biosciences,ETH Zurich,CH-8093 Zurich,Switzerland [2]Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials,Ministry of Education and School of Materials Science and Engineering,Shandong University,Jinan 250061,China [3]Department of Chemistry,University of Basel,Mattenstrasse 24a,BPR 1096,Basel,Switzerland

出　　处：《Science China Materials》2023年第4期1597-1606,共10页中国科学（材料科学（英文版）

基　　金：financially supported by the National Key R&D Program of China(2021YFB3502500);the Natural Science Foundation of Shandong Province(2022HYYQ-014);the Provincial Key Research and Development Program of Shandong(2019JZZY010312 and 2021ZLGX01);the“20 Clauses about Colleges and Universities(new)”(Independent Training of Innovation Team)Program of Jinan(2021GXRC036);the Joint Laboratory Project of Electromagnetic Structure Technology(6372022-70-F-037);Qilu Young Scholar Program of Shandong University(31370082163127)。

摘　　要：聚合物用于改善过渡金属碳化物和/或氮化物(MXenes)的力学性能、构建高性能电磁(EMI)屏蔽结构面临以下挑战:绝缘聚合物对MXene基复合材料导电性和电磁屏蔽性能的影响以及聚合物的不可再生性.本文将一维、超细、可持续的纤维素纳米晶体(CNCs)用于增强MXene纳米片,从而制备出高强度、高柔性、同时兼顾优异导电性和电磁屏蔽效能(SE)的仿生复合材料,其性能优于目前报道的聚合物复合材料.在厚度仅为2–14μm的情况下,MXene/CNC纳米复合材料的电磁屏蔽效能分别达到30–66 d B,比屏蔽效能和面比屏蔽效能分别达到15,155 d B mm^(-1)和54,125 d B cm^(2)g^(-1).复合薄膜具有良好的光热性能,扩展了其应用场景.结合简便、高效、可规模化的常压干燥制备方法得到的超薄、柔韧、高强度、多功能的CNC增强MXene基仿生薄膜在下一代先进电子或航空航天领域显示出巨大的应用潜力.Polymers are widely employed to improve the mechanical properties of transition metal carbides and/or nitrides(MXenes)for constructing high-performance electromagnetic interference(EMI)shields.The challenges involve the insulating-polymer-induced compromise of electrical conductivity and EMI shielding performance of the MXenebased composites and the employment of nonrenewable,petrochemical polymers.Here,the one-dimensional,ultrafine,sustainable cellulose nanocrystals(CNCs)are efficiently employed to reinforce the MXene nanosheets,giving rise to highstrength,highly flexible biomimetic composites that maintain excellent electrical conductivity and EMI shielding effectiveness(SE).The freestanding MXene/CNC nanocomposites gain EMI SE values of 30 to 66 d B at thicknesses of approximately 2 to 14μm,leading to ultrahigh specific SE and surface-specific SE values of 15,155 d B mm-1and 54,125 d B cm^(2)g^(-1),respectively,which are comparable to those of the best EMI shields ever reported.Moreover,the excellent photothermal performance of the composite films was achieved,extending the application scenarios.Combined with the universal,facile,energy-efficient,and scalable ambient pressure drying preparation approach,the ultrathin,flexible,high-strength,and multifunctional CNC-reinforced MXene-based biomimetic films have shown great potential for applications in next-generation advanced flexible electronic or aerospace systems.

关 键 词：仿生复合材料 纤维素纳米晶体 聚合物复合材料 纳米复合材料 常压干燥 电磁屏蔽性能 屏蔽效能 过渡金属碳化物 

分 类 号：TB332[一般工业技术—材料科学与工程]