Lightweight,ultra-flexible,and robust crosslinked transition metal carbide(Ti3C2 MXene)coated polyimide(PI)(C-MXene@PI)porous composites are man-ufactured via a scalable dip-coating followed by chemical crosslinking approach.In addition to the hydrophobicity,anti-oxidation and extreme-temperature stability,efficient utilization of the intrinsic conductivity of MXene,the interfacial polarization between MXene and PI,and the micrometer-sized pores of the composite foams are achieved.Consequently,the composites show a satisfactory X-band electromagnetic interference(EMI)shielding effectiveness of 22.5 to 62.5 dB at a density of 28.7 to 48.7 mg cm-3,leading to an excellent surface-specific SE of 21,317 dB cm2 g-1.Moreover,the composite foams exhibit excellent electrothermal performance as flexible heaters in terms of a prominent,rapid reproducible,and stable electrothermal effect at low volt-ages and superior heat performance and more uniform heat distribution compared with the commercial heaters composed of alloy plates.Furthermore,the composite foams are well attached on a human body to check their electromechanical sensing performance,demonstrating the sensitive and reliable detection of human motions as wearable sensors.The excellent EMI shielding performance and multifunction-alities,along with the facile and easy-to-scalable manufacturing techniques,imply promising perspectives of the porous C-MXene@PI composites in next-generation flexible electronics,aerospace,and smart devices.

Zhi-Hui Zeng;Na Wu;Jing-Jiang Wei;Yun-Fei Yang;Ting-Ting Wu;Bin Li;Stefanie Beatrice Hauser;Wei-Dong Yang;Jiu-Rong Liu;Shan-Yu Zhao

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,People's Republic of China;Department of Chemistry and Applied Biosciences,ETH Zurich,CH-8093 Zurich,Switzerland;Laboratory for Cellulose and Wood Materials,Swiss Federal Laboratories for Materials Science and Technology(Empa),8600 Dübendorf,Switzerland;Laboratory for Building Energy Materials and Components,Swiss Federal Laboratories for Materials Science and Technology(Empa),8600 Dübendorf,Switzerland;School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200092,People's Republic of China

纳微快报（英文）

[1]Zhi-Hui Zeng;Na Wu;Jing-Jiang Wei;Yun-Fei Yang;Ting-Ting Wu;Bin Li;Stefanie Beatrice Hauser;Wei-Dong Yang;Jiu-Rong Liu;Shan-Yu Zhao-.Porous and Ultra-Flexible Crosslinked MXene/Polyimide Composites for Multifunctional Electromagnetic Interference Shielding)[J].纳微快报（英文）,2022(04):59-74

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