Highly conductive Ti₃C₂T_x MXene-based electromagnetic interference (EMI) shielding materials have shown great application potential in facing the increasingly serious electromagnetic radiation threat but are limited by their single-loss mechanism. Here, to enrich the wave loss mechanism, magnetic Ti₃C₂T_x MXene and conductive carbon nanotubes (CNTs) have been assembled into a flexible “brick-mortar” layered NiCo/MX–CNT film to simultaneously obtain high conductivity and strong attenuation capacity. Interestingly, by combining the strong attenuation ability of the magnetic NiCo/MX and high conductivity of CNTs, as well as the dense stacking “brick-mortar” layered structure, 99.99999991% (90.7 dB of EMI shielding effectiveness, SE) of the electromagnetic waves can be reflected and absorbed by the NiCo/MX–CNT composite film with only 53 μm thickness, which is one of the best shielding effects achieved and is superior to that of pure CNT film (∼71 dB) and pure MXene film (∼61 dB), even if they have higher conductivity. Moreover, the composite film can realize EMI shielding property modulation from 46 to 105 dB by adjusting the film thickness from 9 to 116 μm. The dense stacking “brick-mortar” layered structure endows the composite film with excellent flexibility, foldability, and robust mechanical properties, which significantly improve the practical potential in complex application environments.

中文翻译：

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磁性Ti3C2Tx MXene/CNT复合薄膜的高效电磁干扰屏蔽能力

高导电性 Ti ₃ C ₂ T _x MXene 基电磁干扰 (EMI) 屏蔽材料在面对日益严重的电磁辐射威胁方面显示出巨大的应用潜力，但受到其单损耗机制的限制。在这里，为了丰富波损失机制，磁性 Ti ₃ C ₂ T _xMXene 和导电碳纳米管 (CNT) 已组装成柔性的“砖混”层状 NiCo/MX-CNT 薄膜，以同时获得高导电性和强衰减能力。有趣的是，通过结合磁性 NiCo/MX 的强衰减能力和 CNT 的高导电性，以及密集堆叠的“砖-灰浆”层状结构，电磁波的 99.99999991%（90.7 dB 的 EMI 屏蔽效率，SE）可以被厚度仅为 53 μm 的 NiCo/MX-CNT 复合膜反射和吸收，这是实现的最佳屏蔽效果之一，并且优于纯 CNT 膜（~71 dB）和纯 MXene 膜（~61 dB)，即使它们具有更高的电导率。而且，通过将膜厚从9μm调整到116μm，复合膜可以实现EMI屏蔽性能调制从46dB到105dB。密集堆叠的“砖-砂浆”层状结构赋予复合薄膜优异的柔韧性、可折叠性和稳健的机械性能，显着提高了在复杂应用环境中的实际潜力。