Abstract Flexible and multifunctional electromagnetic shielding (EMI) materials have attracted tremendous attention in the field of electromagnetic compatibility and civilian protection. However, these materials encounter an intrinsic contradiction between effective integration of multiple functions and simple, low-cost manufacture process. Herein, a highly electrically/thermally conductive MXene/cellulose nanocomposite paper was fabricated via a simple dip-coating method. Benefiting from the three-dimensional interconnected MXene (Ti3C2Tx) network, the resultant paper exhibits a marvelous electrical conductivity of 2756 S/m at a nanosheet loading of 1.89 vol%. Followed by a polydimethylsiloxane (PDMS) coating, the as-prepared freestanding nanocomposites with 0.2 mm thickness can reach an exceptional EMI shielding effectiveness of over 43 dB in the X and Ku band at the Ti3C2Tx loading of 1.07 vol%, and no apparent decline is observed after 2000 bending-releasing cycles in the durability test. In addition, an in-plane thermal conductivity of 3.89 W/(m⋅K) is achieved, which is 540% higher than that of PDMS coated neat filter paper. This work provides facile strategy to large-scale and green production of flexible and multifunctional EMI materials. Considering the prominent performance, the obtained nanocomposite paper has promising applications in aerospace, stealth weapon equipment, smart electronics and flexible devices.

中文翻译：

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灵活耐用的纤维素/MXene 纳米复合纸可有效屏蔽电磁干扰

摘要 柔性多功能电磁屏蔽（EMI）材料在电磁兼容和民用防护领域引起了极大的关注。然而，这些材料在多种功能的有效集成与简单、低成本的制造工艺之间遇到了内在矛盾。在此，通过简单的浸涂方法制备了一种高导电/导热的 MXene/纤维素纳米复合纸。得益于三维互连的 MXene (Ti3C2Tx) 网络，所得纸在 1.89 vol% 的纳米片负载下表现出 2756 S/m 的惊人电导率。随后是聚二甲基硅氧烷 (PDMS) 涂层，所制备的独立式纳米复合材料具有 0. 在 Ti3C2Tx 负载为 1.07 vol% 的情况下，2 mm 的厚度可以在 X 和 Ku 波段达到超过 43 dB 的卓越 EMI 屏蔽效率，并且在耐久性测试中在 2000 次弯曲释放循环后没有观察到明显的下降。此外，还实现了 3.89 W/(m⋅K) 的面内热导率，比涂有 PDMS 的纯滤纸高 540%。这项工作为柔性多功能EMI材料的大规模绿色生产提供了简便的策略。考虑到其突出的性能，所获得的纳米复合纸在航空航天、隐身武器装备、智能电子和柔性器件等领域具有广阔的应用前景。实现了 3.89 W/(m·K) 的面内热导率，比涂有 PDMS 的纯滤纸高 540%。这项工作为柔性多功能EMI材料的大规模绿色生产提供了简便的策略。考虑到其突出的性能，所获得的纳米复合纸在航空航天、隐身武器装备、智能电子和柔性器件等领域具有广阔的应用前景。实现了 3.89 W/(m·K) 的面内热导率，比涂有 PDMS 的纯滤纸高 540%。这项工作为柔性多功能EMI材料的大规模绿色生产提供了简便的策略。考虑到其突出的性能，所获得的纳米复合纸在航空航天、隐身武器装备、智能电子和柔性器件等领域具有广阔的应用前景。