High-strength, super-tough, and durable nacre-inspired MXene/heterocyclic aramid nanocomposite films for electromagnetic interference shielding and thermal management

材料科学 纳米复合材料 MXenes公司 复合材料 热稳定性 电磁屏蔽 极限抗拉强度 层状结构 芳纶 纳米技术 化学工程 纤维 工程类
作者
Jinhua Xiong,Renjie Ding,Zonglin Liu,Haowen Zheng,Pengyang Li,Zhong Chen,Qian Yan,Xu Zhao,Fuhua Xue,Qingyu Peng,Xiaodong He
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:474: 145972-145972 被引量:53
标识
DOI:10.1016/j.cej.2023.145972
摘要

2D transition-metal carbides, known as MXenes, are among the most promising electromagnetic interference (EMI) shielding materials due to their outstanding metal-like electrical conductivity and high hydrophilicity. However, a significant drawback of these materials is mechanical brittleness and inferior oxidation stability, which impedes their applications in lightweight, flexible electronics. Herein, inspired by natural nacre, the large-area, high-strength, super-tough, and durable lamellar MXene/heterocyclic aramid (HA) nanocomposite films are fabricated through a blade-coating process plus sol-gel-film conversion technique. The MXene/HA nanocomposite film containing 20 wt% MXene possesses extraordinary mechanical performance, that is, high tensile strength (322.6 MPa), enormous strain (16.2%), exceptional toughness (43.3 MJ m−3), remarkable folding endurance, and good structural stability, which are attributed to nacre-like lamellar structure and hydrogen-bonding interaction between MXene and HA. More interestingly, due to the formation of the continuous MXene conductive paths, the MXene/HA nanocomposite film filled with 80 wt% MXene presents an EMI SE of 43.0 dB at a thickness of 13.0 μm, a high EMI shielding effectiveness of 14529.1 dB cm2 g−1 and a superior in-plane thermal conductivity of 11.5 W m−1 K−1. The nacre-like film also exhibits excellent oxidation stability, thermal stability, flame retardancy, and photothermal performance. Thus, such high-performance MXene-based films fabricated by a facile and scalable manufacturing method show great potential in the field of electromagnetic shielding and thermal management.
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