Dual functional composite films with high electromagnetic interference (EMI) shielding and photothermal conversion properties are urgently demanded for modern microelectronic devices, especially to be used in an extreme environment. Here, flexible and lightweight MXene/AgNW/PU composite foam films were constructed by incorporating 1D AgNWs and 2D MXene in a PU matrix for highly efficient electromagnetic interference shielding and photothermal conversion. The 3D conductive network of AgNWs and MXene as well as the porous structure with multiple interfaces facilitated a high shielding effectiveness of 50 dB at a low density of 0.15 g/cm³ in X-band with a high absorption-dominated shielding efficiency of 86%. In the frequency of Ku-band, the composite foam film presented a higher shielding efficiency of 60 dB with the absorption efficiency as high as 95%, representing an excellent absorption-dominated shielding performance. The composite foam film remained an excellent EMI shielding efficiency of 41.5 dB after 1000 cycles of compression and release. Furthermore, the composite foam film showed a high photothermal conversion property. The flexible and lightweight MXene/AgNW/PU composite foam films provided a facile strategy for applications of EMI shielding and photothermal conversion in aerospace as well as portable smart electronics.

现代微电子器件迫切需要具有高电磁干扰（EMI）屏蔽和光热转换性能的双功能复合薄膜，特别是在极端环境下使用。在这里，通过将 1D AgNWs 和 2D MXene 结合到 PU 基质中，构建了灵活且轻质的 MXene/AgNW/PU 复合泡沫薄膜，以实现高效的电磁干扰屏蔽和光热转换。AgNWs 和 MXene 的 3D 导电网络以及具有多个界面的多孔结构在 0.15 g/cm ^{3 的}低密度下促进了 50 dB 的高屏蔽效率在 X 波段，具有 86% 的高吸收主导屏蔽效率。在Ku波段频率下，复合泡沫膜表现出较高的屏蔽效率60 dB，吸收效率高达95%，表现出优异的吸收为主的屏蔽性能。该复合泡沫膜在经过 1000 次压缩和释放循环后仍保持 41.5 dB 的优异 EMI 屏蔽效率。此外，复合泡沫膜表现出较高的光热转换性能。柔性轻巧的 MXene/AgNW/PU 复合泡沫薄膜为 EMI 屏蔽和光热转换在航空航天以及便携式智能电子产品中的应用提供了一种简便的策略。