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<p>MXene-based multilayered composite films show great promise in electromagnetic interference (EMI) shielding field, but the trade-off between mechanical properties, oxidation resistance and EMI shielding performance remains a huge challenge. Herein, inspired by the architecture of millefeuille, alternating multilayered MXene/carbon nanotube (CNT) films were successfully prepared using an alternating vacuum-assisted filtration method, in which the alternating CNT layers not only act as the mechanical frame and oxidation barrier, but also synergistically enhance the EMI shielding effect of MXene layers through the distinctive “absorption-reflection-reabsorption” mechanism. By optimizing the alternating multilayered structure, the MXene/CNT film with a thickness of 36 µm can achieve a remarkable EMI shielding effectiveness (SE) of 81.4 dB across the frequency range of 8.2–26.5 GHz. Meanwhile, the mechanical strength and toughness of the MXene/CNT film reach 83.4 MPa and 7.20 MJ/m<sup>3</sup>, respectively. Moreover, the CNT layer can effectively isolate MXene layer from oxygen, thus enabling the fire/oxidation resistance of the multilayer film in complex environments. Besides, the multilayered composite film exhibits impressive Joule heating capacity, which can reach 237 °C within 10 s at an applied voltage of only 2.0 V. Therefore, the alternating multilayered MXene/CNT film breaks through the performance balance limit, showing a great prospect for the future.</p>

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Robust alternating multilayered MXene/CNT films for high-performance EMI shielding and Joule heating with superior fire/oxidation resistance

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • Yong Shen,
  • Yitong Yue,
  • Hexie Li,
  • Yahong Li,
  • Hu Liu,
  • Bing Zhou,
  • Yuezhan Feng,
  • Chuntai Liu,
  • Changyu Shen

摘要

MXene-based multilayered composite films show great promise in electromagnetic interference (EMI) shielding field, but the trade-off between mechanical properties, oxidation resistance and EMI shielding performance remains a huge challenge. Herein, inspired by the architecture of millefeuille, alternating multilayered MXene/carbon nanotube (CNT) films were successfully prepared using an alternating vacuum-assisted filtration method, in which the alternating CNT layers not only act as the mechanical frame and oxidation barrier, but also synergistically enhance the EMI shielding effect of MXene layers through the distinctive “absorption-reflection-reabsorption” mechanism. By optimizing the alternating multilayered structure, the MXene/CNT film with a thickness of 36 µm can achieve a remarkable EMI shielding effectiveness (SE) of 81.4 dB across the frequency range of 8.2–26.5 GHz. Meanwhile, the mechanical strength and toughness of the MXene/CNT film reach 83.4 MPa and 7.20 MJ/m3, respectively. Moreover, the CNT layer can effectively isolate MXene layer from oxygen, thus enabling the fire/oxidation resistance of the multilayer film in complex environments. Besides, the multilayered composite film exhibits impressive Joule heating capacity, which can reach 237 °C within 10 s at an applied voltage of only 2.0 V. Therefore, the alternating multilayered MXene/CNT film breaks through the performance balance limit, showing a great prospect for the future.