Significantly Enhanced Electromagnetic Interference Shielding Performances of Epoxy Nanocomposites with Long-Range Aligned Lamellar Structures

IF 31.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Nano-Micro Letters Pub Date : 2022-11-15 DOI:10.1007/s40820-022-00949-8

Lei Wang, Zhonglei Ma, Hua Qiu, Yali Zhang, Ze Yu, Junwei Gu

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Abstract

High‑efficiency electromagnetic interference (EMI) shielding materials are of great importance for electronic equipment reliability, information security and human health. In this work, bidirectional aligned Ti₃C₂T_x@Fe₃O₄/CNF aerogels (BTFCA) were firstly assembled by bidirectional freezing and freeze-drying technique, and the BTFCA/epoxy nanocomposites with long-range aligned lamellar structures were then prepared by vacuum-assisted impregnation of epoxy resins. Benefitting from the successful construction of bidirectional aligned three-dimensional conductive networks and electromagnetic synergistic effect, when the mass fraction of Ti₃C₂T_x and Fe₃O₄ are 2.96 and 1.48 wt%, BTFCA/epoxy nanocomposites show outstanding EMI shielding effectiveness of 79 dB, about 10 times of that of blended Ti₃C₂T_x@Fe₃O₄/epoxy (8 dB) nanocomposites with the same loadings of Ti₃C₂T_x and Fe₃O₄. Meantime, the corresponding BTFCA/epoxy nanocomposites also present excellent thermal stability (T_{heat-resistance index} of 198.7 °C) and mechanical properties (storage modulus of 9902.1 MPa, Young's modulus of 4.51 GPa and hardness of 0.34 GPa). Our fabricated BTFCA/epoxy nanocomposites would greatly expand the applications of MXene and epoxy resins in the fields of information security, aerospace and weapon manufacturing, etc.

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具有长距离排列片状结构的环氧纳米复合材料的电磁干扰屏蔽性能显著增强

高效电磁干扰（EMI）屏蔽材料对电子设备的可靠性、信息安全和人类健康具有重要意义。本研究首先利用双向冷冻和冻干技术组装了双向排列的 Ti3C2Tx@Fe3O4/CNF 气凝胶（BTFCA），然后利用真空辅助环氧树脂浸渍法制备了具有长程排列片层结构的 BTFCA/epoxy 纳米复合材料。当 Ti3C2Tx 和 Fe3O4 的质量分数分别为 2.96 和 1.48 wt% 时，BTFCA/环氧纳米复合材料成功构建了双向排列的三维导电网络，并产生了电磁协同效应，其电磁干扰屏蔽效果达到 79 dB，是相同 Ti3C2Tx 和 Fe3O4 负载的混合 Ti3C2Tx@Fe3O4/epoxy 纳米复合材料（8 dB）的 10 倍。同时，相应的 BTFCA/epoxy 纳米复合材料还具有优异的热稳定性（耐热指数为 198.7 ℃）和机械性能（存储模量为 9902.1 MPa，杨氏模量为 4.51 GPa，硬度为 0.34 GPa）。我们制备的 BTFCA/epoxy 纳米复合材料将大大拓展 MXene 和环氧树脂在信息安全、航空航天和武器制造等领域的应用。

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来源期刊

Nano-Micro Letters NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

42.40

自引率

4.90%

发文量

715

审稿时长

13 weeks

期刊介绍： Nano-Micro Letters is a peer-reviewed, international, interdisciplinary and open-access journal that focus on science, experiments, engineering, technologies and applications of nano- or microscale structure and system in physics, chemistry, biology, material science, pharmacy and their expanding interfaces with at least one dimension ranging from a few sub-nanometers to a few hundreds of micrometers. Especially, emphasize the bottom-up approach in the length scale from nano to micro since the key for nanotechnology to reach industrial applications is to assemble, to modify, and to control nanostructure in micro scale. The aim is to provide a publishing platform crossing the boundaries, from nano to micro, and from science to technologies.