Thin, Flexible, and High-Strength Graphene Films Modified with CoFe₂O₄ Nanoparticle–Carbon Nanotubes Composites for Electromagnetic Interference Shielding

Thin, high-strength graphene films are at the forefront of research regarding electromagnetic interference (EMI) shielding applications. Herein, we synthesized a novel graphene-based film (CoFe2O4 nanoparticle-carbon nanotubes (CFO–CNTs)/reduced graphene oxide (RGO)p) reinforced with porous CFO–CNTs nanocomposites and self-cross-linking trimethylolpropane triacrylate between the RGO sheets. Only a 15-μm-thick (thin) CFO–CNTs/RGOp film exhibits an excellent EMI shielding effectiveness (EMI SE) value of 38.7 dB as well as an excellent tensile strength (84.5 MPa) because of synergistic interfacial and cross-linking interactions. Further, the film subjected to ultraviolet aging retains 86.6% and 82.4% of its original EMI SE and tensile strength, respectively, indicating high durability. Because of the outstanding integrated features and high durability, the as-prepared film can be used to shield aircrafts and miniaturized electronic devices from EMIs in extreme environments.