文献类型：期刊文献

英文题名：Ultralight, highly compressible, thermally stable MXene/aramid nanofiber anisotropic aerogels for electromagnetic interference shielding

作者：Du, Yiqian[1];Xu, Jian[1];Fang, Jiangyu[1];Zhang, Yantai[1];Liu, Xiaoyun[1];Zuo, Peiyuan[1];Zhuang, Qixin[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Adv Polymer Mat Shanghai, Shanghai 200237, Peoples R China

年份：2022

卷号：10

期号：12

起止页码：6690

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20221611965450);WOS:【SCI-EXPANDED(收录号:WOS:000759074500001)】；

基金：This work was supported by the National Natural Science Foundation of China (52073091, 51773060, 51573045, 22171086) and the Natural Science Foundation of Shanghai (20ZR1414600).

语种：英文

外文关键词：Signal interference - Transition metals - Nanofibers - Electromagnetic pulse - Electromagnetic shielding - Thermodynamic stability - Anisotropy - Efficiency - Nanosheets

摘要：Recently, improving the applicability of transition-metal carbon/nitride (MXene) shielding devices through integration with nanomaterials and polymers has gradually attracted the attention of researchers. Although the addition of an insulation enhancement phase improves the mechanical properties of MXene shielding devices, it is still a challenge to avoid extensive damage to the conductive network and the reduction of the shielding efficiency (SE). Herein, an effective approach is demonstrated to construct an ultralight, conductive Ti3C2Tx MXene/aramid nanofiber (ANF) anisotropic aerogel. Thanks to the strong interfacial interaction between the MXene nanosheets and ANFs, abundant rigid skeleton and "cell wall" structures were constructed in the anisotropic aerogel. The aerogel was not only endowed with excellent compressibility and superelasticity, but also built a macroscopic conductive network, thus increasing the impedance mismatch interface, and ensuring the electromagnetic interference (EMI) shielding performance of the device. At an ultra-low Ti3C2Tx content (0.58 vol%), the conductivity of the composite aerogel reached a maximum of 854.9 S m(-1) and the EMI SE reached 65.5 dB, which is the best efficiency value of an aerogel based on ANFs so far. In addition, the anisotropic Ti3C2Tx/ANF aerogel had consistent thermal stability and flame retardant properties. The nanosheet edge protection based on ANFs delayed the oxidation of MXene, and the EMI SE still reached 59.1 dB after 2 h of exposure in air at 250 degrees C. Therefore, the ultralight, superelastic, and thermally stable Ti3C2Tx/ANF anisotropic aerogel prepared in this work showed excellent application prospects in various extreme conditions.