Triple‐structured polyvinylidene fluoride‐based composite films with high conductivity and EM shielding properties

Abstract Functionalized thin films with excellent flexibility and conductivity can meet the current requirements for electromagnetic(EM) shielding materials. In this paper, 2D transitions metal carbide and nitride nanomaterials Ti₃C₂T_x MXene were prepared by chemical exfoliation, and PVDF/MWCNTs/3 wt%/RGO@Fe₃O₄@ AgNWs‐10 based on PVDF/MWCNTs‐3 wt%/RGO@Fe₃O₄@AgNWs‐10, The samples were prepared through a simple solution mixing process followed by vacuum‐assisted filtration (VAF), and PVDF/MWCNTs/MXene/RGO@Fe₃O₄@AgNWs three‐layer PVDF‐based composite films, which were analyzed for electrical conductivity and EM shielding properties, which increased and then decreased with the rise in the Ti₃C₂T_x MXene content, in which the highest electrical conductivity of the three‐layer composite films of M3/MX‐10/R@F@Ag was obtained when the Ti₃C₂T_x MXene addition amount reached 10 mL as 3.9 × 10³ S/m, the EMI SE_T is 54.9 dB, the EMI SE_A is 44.8 dB, the absorption loss is 81.6%, and the SSEt of the M3/MX‐10/R@F@Ag three‐layer composite film is the highest 1672.5 dB/(cm⁻²·g). And the SE_A/SE_R ratios of the M3/MX‐X/R@F@Ag three‐layer composite films are all greater than 1. The result shows that the EM attenuation mechanism of the M3/MX‐X/R@F@Ag three‐layer composite films is primarily driven by absorption loss and that the incorporation of Ti3C2T_x Mxene improves the EM shielding performance of the composite films. The relatively novel exploration of the performance study and structural design of the M3/MX‐X/R@F@Ag three‐layer EM shielding composite film provides structural design and research ideas for the application of the new MXenes material in EM shielding composites. Highlights The addition of Ti₃C₂T_x MXene will generate more conductive network nodules A complete 3D conductive network is constructed in the membrane This paper discusses the influence of Ti3C2Tx MXene on EM shielding Multiple internal reflections of EMW between Ti₃C₂T_x MXene 2D nanosheets The EM shielding mechanism of the film is discussed from the angle of 3D