作者：Yali Zhang, Zhonglei Ma, Kunpeng Ruan 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：Research
发表时间：2022年

Yali Zhang, Zhonglei Ma, Kunpeng Ruan and Junwei Gu*. Flexible Ti3C2Tx/(Aramid Nanofiber/PVA) Composite Films for Superior Electromagnetic Interference Shielding. Research, 2022, 2022: 9780290.（1区综合类Top期刊，2021中国最具国际影响力学术期刊，《Science》自1880年创建以来第一本合作期刊）https://doi.org/10.34133/2022/9780290

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Multifunctional electromagnetic interference (EMI) shielding materials would solve electromagnetic radiation & pollution problems from electronic devices. Herein, the directional freeze-drying technology is utilized to prepare the aramid nanofiber/polyvinyl alcohol aerogel with directionally porous structure (D-ANF/PVA), and the Ti3C2Tx dispersion is fully immersed into the D-ANF/PVA aerogel via ultrasonication & vacuum-assisted impregnation. Ti3C2Tx/(ANF/PVA) EMI shielding composite films with directionally ordered structure (D-Ti3C2Tx) are then prepared by freeze-drying and hot-pressing. Constructing directionally porous structure enables the highly conductive Ti3C2Tx nanosheets to be wrapped on the directionally porous D-ANF/PVA framework in order arrangement and overlapped with each other. And the hot-pressing process effectively reduces the layer spacing between the stacked wavy D-ANF/PVA, to form a large number of Ti3C2Tx-Ti3C2Tx continuous conductive paths, which significantly improves the conductivity of the D-Ti3C2Tx/(ANF/PVA) EMI shielding composite film. When the amount of Ti3C2Tx is 80 wt%, the EMI shielding effectiveness (EMI SE) and specific SE (SSE/t) of D-Ti3C2Tx/(ANF/PVA) EMI shielding composite film achieve 70 dB and 13790 dB·cm2·g-1 (thickness and density of 120 μm and 0.423 g·cm-3), far superior to random-structured Ti3C2Tx/(ANF/PVA) (R-Ti3C2Tx/(ANF/PVA)) composite film (46 dB and 9062 dB·cm2·g-1, respectively) via blending-freeze drying followed by hot pressing technology. Meantime, the D-Ti3C2Tx/(ANF/PVA) EMI shielding composite film possesses excellent flexibility and foldability.