l-Citrulline-Modified Ti₃C₂T_x MXene Nanosheets Embedded in Polyacrylamide/Sodium Alginate Hydrogels for Electromagnetic Interference Shielding

In this work, a robust and mechanically composite hydrogel with an efficient electromagnetic interference shielding performance was successfully fabricated via the incorporation of l-citrulline-modified Ti3C2Tx MXene nanosheets into the polyacrylamide/sodium alginate hydrogels by using ferrous chloride as the adhesive. A l-citrulline-modified Ti3C2Tx MXene nanosheet was the main shielding medium; ferrous chloride could not only enhance the mechanical property of the resultant hydrogels but also slightly improve the EMI shielding efficiency. The optimal tensile strength (3.42 MPa) and the EMI shielding effectiveness (26.8 dB) were achieved for the composite hydrogels with 6.5 wt % l-citrulline-modified Ti3C2Tx MXene nanosheets and 0.6 mol/L ferrous chloride, and the high ductility (780% elongation at break) of the composite hydrogel was reached with 0.5 wt % l-citrulline-modified Ti3C2Tx MXene and 0.8 mol/L ferrous chlorides. With outstanding mechanical and EMI shielding performances, the prepared composite hydrogels could apply in the electronic skin field.