Ultrathin MWCNT/Ti₃C₂T_x Hybrid Films for Electromagnetic Interference Shielding

The disordered assembly and low conductivity of carbon nanotubes are the main problems that limit the application of electromagnetic interference (EMI) shielding. In this work, an ordered lamellar assembly structure of multiwalled carbon nanotube/Ti₃C₂T_x (MWCNT/Ti₃C₂T_x) hybrid films was achieved by vacuum-assisted filtration through the hybridization of Ti₃C₂T_x nanosheets and carbon nanotubes, where carbon nanotubes were tightly sticking on the surface of Ti₃C₂T_x nanosheets via physical adsorption and hydrogen bonding. Compared with the pure carbon nanotubes films, the hybrid MWCNT/Ti₃C₂T_x films achieved a significant improvement in conductivity of 452.5 S/cm and EMI shielding effectiveness (SE) of 44.3 dB under 50 wt% Ti₃C₂T_x with a low thickness (8.6 μm) and orderly lamellar stacking structure, which finally resulted in high specific SE (SSE/t, SE divided by the density and thickness) of 55,603.1 dB∙cm²∙g^-1.