作者：Ping Song, Zhonglei Ma*, Hua Qiu, Yifan Ru and Junwei Gu*
关键字：Electromagnetic interference shielding，MXene，MXene/polymer composites，Research progress
论文来源：期刊
具体来源：Nano-Micro Letters
发表时间：2022年

Ping Song, Zhonglei Ma*, Hua Qiu, Yifan Ru and Junwei Gu*. High-Efficiency Electromagnetic Interference Shielding of rGO@FeNi/Epoxy Composites with Regular Honeycomb Structures. Nano-Micro Letters, 2022, 14: 51. 2020IF=16.419.（1区材料科学Top期刊，2021中国最具国际影响力学术期刊）

https://doi.org/10.1007/s40820-022-00798-5

With the rapid development of fifth-generation (5G) mobile communication technology and wearable electronic devices, electromagnetic interference (EMI) and radiation pollution caused by electromagnetic waves have attracted worldwide attention. Therefore, the design and development of highly efficient EMI shielding materials are of great importance. In this work, the three-dimensional (3D) graphene oxide (GO) with regular honeycomb structure (GH) is firstly constructed by sacrificial template and freeze-drying methods. Then the amino functionalized FeNi alloy particles (f-FeNi) are loaded on the GH skeleton followed by in-situ reduction to prepare rGH@FeNi aerogel. Finally, the rGH@FeNi/epoxy EMI shielding composites with regular honeycomb structure is obtained by vacuum-assisted impregnation of epoxy resin. Benefitting from the construction of regular honeycomb structure and electromagnetic synergistic effect, the rGH@FeNi/epoxy composites with a low rGH@FeNi mass fraction of 2.1 wt% (rGH and f-FeNi are 1.2 wt% and 0.9 wt% respectively) exhibit a high EMI shielding effectiveness (EMI SE) of 46 dB, which is 5.8 times of that (8 dB) for rGO/FeNi/epoxy composites with the same rGO/FeNi mass fraction. At the same time, the rGH@FeNi/epoxy composites also possess excellent thermal stability (heat-resistance index and temperature at the maximum decomposition rate are 179.1oC and 389.0oC respectively) and mechanical properties (storage modulus is 8296.2 MPa).随着现代5G通信技术和可穿戴电子设备的快速发展，由电磁波引起的电磁干扰和对人体的电磁辐射问题引起了社会各界的广泛关注，高效电磁屏蔽材料的设计研发显得尤为重要。本文首先通过牺牲模板-冷冻干燥法构建规整蜂窝结构石墨烯（rGH）骨架，再将表面功能化改性的磁性FeNi合金颗粒（f-FeNi）负载于rGH骨架制备rGH@FeNi气凝胶，真空辅助浸渍环氧树脂后经高温固化得到具有规整蜂窝结构的rGH@FeNi/环氧树脂电磁屏蔽复合材料。得益于规整蜂窝结构和电磁复合体系的构建，当rGH@FeNi质量分数仅为2.1 wt%时（rGH为1.2 wt%，f-FeNi为0.9 wt%），rGH@FeNi/环氧树脂复合材料的电磁屏蔽效能（EMI SE）值提升至46 dB，是同等rGO/FeNi质量分数下共混rGO/FeNi/环氧树脂复合材料EMI SE（8 dB）的5.8倍。同时，rGH@FeNi/环氧树脂复合材料还具有优异的热稳定性（耐热指数和发生最大分解速率的温度分别为179.1oC和389.0oC）和力学性能（储能模量为8296.2 MPa）。