Super-Tough and Environmentally Stable Aramid Nanofiber@MXene Coaxial Fibers with Outstanding Electromagnetic Interference Shielding Efficiency  

作　　者：Liu-Xin Liu Wei Chen Hao-Bin Zhang Lvxuan Ye Zhenguo Wang Yu Zhang Peng Min Zhong-Zhen Yu 

机构地区：[1]State Key Laboratory of Organic-Inorganic Composites,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,People’s Republic of China [2]Beijing Key Laboratory of Advanced Functional Polymer Composites,Beijing University of Chemical Technology,Beijing 100029,People’s Republic of China [3]Beijing Advanced Innovation Center for Soft Matter Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,People’s Republic of China

出　　处：《Nano-Micro Letters》2022年第7期72-85,共14页纳微快报（英文版）

基　　金：Financial support from the National Natural Science Foundation of China(51922020,52090034);the Fundamental Research Funds for the Central Universities(BHYC1707B,XK1802-2)。

摘　　要：Although electrically conductive and hydrophilic MXene sheets are promising for multifunctional fibers and electronic textiles,it is still a challenge to simultaneously enhance both conductivity and mechanical properties of MXene fibers because of the high rigidity of MXene sheets and insufficient inter-sheet interactions.Herein,we demonstrate a core-shell wet-spinning methodology for fabricating highly conductive,super-tough,ultra-strong,and environmentally stable Ti_(3)C_(2)T_(x) MXene-based core-shell fibers with conductive MXene cores and tough aramid nanofiber(ANF)shells.The highly orientated and low-defect structure endows the ANF@MXene core-shell fiber with supertoughness of~48.1 MJ m^(-3),high strength of~502.9 MPa,and high conductivity of~3.0×10^(5)S m^(-1).The super-tough and conductive ANF@MXene fibers can be woven into textiles,exhibiting an excellent electromagnetic interference(EMI)shielding efficiency of 83.4 dB at a small thickness of 213μm.Importantly,the protection of the ANF shells provides the fibers with satisfactory cyclic stability under dynamic stretching and bending,and excellent resistance to acid,alkali,seawater,cryogenic and high temperatures,and fire.The oxidation resistance of the fibers is demonstrated by their wellmaintained EMI shielding performances.The multifunctional core-shell fibers would be highly promising in the fields of EMI shielding textiles,wearable electronics and aerospace.

关 键 词：Core-shell fibers MXene sheets Electromagnetic interference shielding Aramid nanofibers SUPER-TOUGHNESS 

分 类 号：TN03[电子电信—物理电子学] TS106[轻工技术与工程—纺织工程]