Multi-layered graphene-Fe3O4/poly (vinylidene fluoride) hybrid composite films for high-efficient electromagnetic shielding

A flexible and multi-layered graphene nanosheets (GNSs)-Fe3O4/poly (vinylidene fluoride) hybrid composite film with high-efficient electromagnetic interference (EMI) shielding was fabricated via a facile layer-by-layer coating. The well-designed multi-layered and hybrid electromagnetic fillers endow the prepared film with good surface impedance matching and prominent internal multiple absorption, which forms “absorb-reflect-reabsorb” electromagnetic transmission pattern and results in highly efficient electromagnetic shielding effectiveness (EMI SE). The resultant composite film exhibits an exceptional EMI SE of 52.0 dB at a thickness of 0.3 mm. What is more important is that the prepared film exhibits excellent flexibility and EMI stability, and the retention rate of efficient EMI SE is high as 91.9% after 1000 bending-release cycles. This study provides a feasible strategy for designing high-efficient EMI shielding film with excellent flexibility and ultra-thin thickness that suitable for next-generation intelligent protection devices. •A novel multi-layered structural composite film was fabricated successfully via a facile layer-by-layer coating method.•The prepared GNSs-Fe3O4/PVDF composite film exhibits outstanding flexibility and ultra-efficient EMI SE.•The film with only thickness 0.30 mm can show an EMI SE of as high as 52.0 dB.•The EMI SE of GNSs-Fe3O4/PVDF composite film exhibits excellent stability during the bending deformation process.•The EMI shielding characteristic can be artificially controlled by regulating the structure.