Mxene hybrid polyvinyl alcohol flexible composite films for electromagnetic interference shielding

The light weight and high integration of modern electronic equipment put forward higher and higher requirements for electromagnetic interference (EMI) shielding films. Herein, a structure of ternary MXene/graphene@Fe₃O₄/PVA (polyvinyl alcohol) films with high flexibility and good EMI shielding performance were prepared by simple casting method, the resulting fillers showed good compatibility with the PVA matrix. Surprisingly, the EMI SE of the resulting film with a thickness of only 1 mm reached 36 dB in X band, especially since it exhibited a shielding dominated by the absorption of electromagnetic waves (SE_A was 32 dB). The obtained PVA composite films displayed classic ductile fracture characteristics, and the elongation at break was greater than 160%. Conductive MXene and graphene promoted the dielectric loss of electromagnetic waves, while magnetic Fe₃O₄ particles were beneficial to the magnetic loss of electromagnetic waves. Furthermore, the layered ternary MXene/graphene@Fe₃O₄ structure enhanced the multiple reflection and attenuation of electromagnetic waves inside the composites, which reinforced PVA films very promising as thinner and lighter EMI shielding materials in the field of flexible electronics.