Heterogeneous Ti₃C₂T_x MXene-MWCNT@MoS₂ Film for Enhanced Long-Term Electromagnetic Interference Shielding in the Moisture Environment

MXene, as a novel two-dimensional (2D) material, has unique inherent features such as lightweight, flexibility, high electrical conductivity, customizable surface chemistry, and facile solution processability. However, utilizing MXene (Ti₃C₂T_x) films for long-term electromagnetic interference (EMI) shielding poses challenges, as they are susceptible to chemical deterioration through oxidation into TiO₂. In this work, an ultrathin heterogeneous film of Ti₃C₂T_x MXene integrated with multiwalled carbon nanotubes supporting MoS₂ clusters (MXene/MWCNT@MoS₂) was developed. The heterogeneous film with 15 wt % of MWCNT@MoS₂ clusters exhibited improved EMI shielding performance such as the highest EMI shielding effectiveness of 50 dB and the specific shielding effectiveness of 20,355 dB cm² g ^-1, mainly attributed to the excellent electrical conductivity, distinctive porous structure, and multiple interfacial interactions. The heterogeneous films underwent extended exposure to a moisture environment (35 days), and their structural stability and EMI shielding performance were enhanced by the integration of MWCNT@MoS₂ clusters. As a result, the engineered heterostructure of multilayered hybrid films holds promise as a viable option for improving the EMI shielding effectiveness and stability of Ti₃C₂T_x MXene.