Ultrathin, flexible, and oxidation-resistant MXene/graphene porous films for efficient electromagnetic interference shielding

Abstract

Designing and fabricating efficient electromagnetic interference (EMI) shielding materials becomes a significant and urgent concern. Hence, a novel ultrathin, flexible, and oxidation-resistant MXene-based graphene (M-rGX) porous film is successfully fabricated by electrostatic self-assembly between MXene and graphene oxide (GO) nanosheets, and subsequently thermal annealing under hydrogen-argon atmosphere. The rapid breakaway of functional groups on GO and MXene sheets induces formation of porous conductive network in film, thereby facilitating efficient shielding for incident electromagnetic waves. The optimal absolute shielding effectiveness (SSE/t) value of 76,422 dB·cm2·g−1 can be achieved at a thinner thickness of 15 pm. More importantly, the effective removal of functional groups on MXene conspicuously improves the oxidation resistance of the film, endowing it with an excellent durability (12 months) in EMI shielding performance.