High-performance electromagnetic wave absorption and electromagnetic interference (EMI) shielding materials with multifunctional characters have attracted extensive scientific and technological interest, but they remain a huge challenge. Here, we reported an electrostatic assembly approach for fabricating 2D/1D/0D construction of Ti₃C₂T_x/carbon nanotubes/Co nanoparticles (Ti₃C₂T_x/CNTs/Co) nanocomposites with an excellent electromagnetic wave absorption, EMI shielding efficiency, flexibility, hydrophobicity, and photothermal conversion performance. As expected, a strong reflection loss of -85.8 dB and an ultrathin thickness of 1.4 mm were achieved. Meanwhile, the high EMI shielding efficiency reached 110.1 dB. The excellent electromagnetic wave absorption and shielding performances were originated from the charge carriers, electric/magnetic dipole polarization, interfacial polarization, natural resonance, and multiple internal reflections. Moreover, a thin layer of polydimethylsiloxane rendered the hydrophilic hierarchical Ti₃C₂T_x/CNTs/Co hydrophobic, which can prevent the degradation/oxidation of the MXene in high humidity condition. Interestingly, the Ti₃C₂T_x/CNTs/Co film exhibited a remarkable photothermal conversion performance with high thermal cycle stability and tenability. Thus, the multifunctional Ti₃C₂T_x/CNTs/Co nanocomposites possessing a unique blend of outstanding electromagnetic wave absorption and EMI shielding, light-driven heating performance, and flexible water-resistant features were highly promising for the next-generation intelligent electromagnetic attenuation system.

• The 2D/1D/0D Ti₃C₂T_x/carbon nanotubes/Co nanocomposite is successfully synthesized via an electrostatic assembly.

• Nanocomposites exhibit an excellent electromagnetic wave absorption and a remarkable electromagnetic interference shielding efficiency.

• The flexible, waterproof, and photothermal conversion performances are achieved.

具有多功能特性的高性能电磁波吸收和电磁干扰（EMI）屏蔽材料引起了广泛的科学和技术兴趣，但仍然是一个巨大的挑战。在这里，我们报道了一种静电组装方法，用于制造 Ti ₃ C ₂ T _x /碳纳米管 / Co 纳米粒子（Ti ₃ C ₂ T _{x ）的 2D/1D/0D 结构。}/CNTs/Co) 纳米复合材料具有优异的电磁波吸收、EMI 屏蔽效率、柔韧性、疏水性和光热转换性能。正如预期的那样，实现了 -85.8 dB 的强反射损耗和 1.4 mm 的超薄厚度。同时，高EMI屏蔽效率达到110.1 dB。优异的电磁波吸收和屏蔽性能源于电荷载流子、电/磁偶极子极化、界面极化、自然共振和多次内反射。此外，一层薄薄的聚二甲基硅氧烷使亲水的分级Ti ₃ C ₂ T _x/CNTs/Co 疏水性，可防止 MXene 在高湿度条件下降解/氧化。有趣的是，Ti ₃ C ₂ T _x /CNTs/Co 薄膜表现出显着的光热转换性能，具有高热循环稳定性和耐久性。因此，多功能Ti ₃ C ₂ T _x /CNTs/Co纳米复合材料具有独特的电磁波吸收和EMI屏蔽、光驱动加热性能和灵活的防水特性，有望用于下一代智能电磁波。衰减系统。

• 通过静电组装成功合成了2D/1D/0D Ti ₃ C ₂ T _x /碳纳米管/Co纳米复合材料。

• 纳米复合材料表现出优异的电磁波吸收和显着的电磁干扰屏蔽效率。

• 实现了柔性、防水和光热转换性能。