材料科学
电磁屏蔽
复合数
复合材料
极化(电化学)
多孔性
电磁干扰
电磁辐射
反射损耗
反射(计算机编程)
电磁干扰
乙烯醇
吸收(声学)
光学
聚合物
电子工程
物理化学
工程类
化学
物理
程序设计语言
计算机科学
作者
Hailong Xu,Xiaowei Yin,Xinliang Li,Minghang Li,Shuang Liang,Litong Zhang,Laifei Cheng
标识
DOI:10.1021/acsami.8b21671
摘要
Lightweight absorption-dominated electromagnetic interference (EMI) shielding materials are more attractive than conventional reflection-dominated counterparts because they minimize the twice pollution of the reflected electromagnetic (EM) wave. Here, porous Ti2CTx MXene/poly(vinyl alcohol) composite foams constructed by few-layered Ti2CTx (f-Ti2CTx) MXene and poly(vinyl alcohol) (PVA) are fabricated via a facile freeze-drying method. As superior EMI shielding materials, their calculated specific shielding effectiveness reaches up to 5136 dB cm2 g–1 with an ultralow filler content of only 0.15 vol % and reflection effectiveness (SER) of less than 2 dB, representing the excellent absorption-dominated shielding performance. Contrast experiment reveals that the good impedance matching derived from the multiple porous structures, internal reflection, and polarization effect (dipole and interfacial polarization) plays a synergistic role in the improved absorption efficiency and superior EMI shielding performance. Consequently, this work provides a promising MXene-based EMI shielding candidate with lightweight and high strength features.
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