High Hydrophobic Wood/Cu-Fe3O4@Graphene/Ni Composites for Electromagnetic Interference Shielding

Wood/Cu-Fe 3 O 4 @graphene/Ni composites with perfect electromagnetic interference (EMI) shielding were prepared via simple electroless method. By adding Fe 3 O 4 @graphene (F3G1) with high crystallinity and purity, the conductivity of the composite was greatly improved. The microstructure observation results showed that the micro-nano particles were uniformly distributed on the wood surface, forming a dense coating. The composite exhibited electrical conductivity, high hydrophobic, and low surface roughness, and was evaluated using EMI shielding studies. Micro-nano Cu and Ni particles were combined on the surface of low-cost and sustainable wood. The average electromagnetic interference shielding effectiveness (EMISE) of composites was as high as 96.79 dB in the frequency range of 300 kHz–3 GHz ascribed to the interface-compatible and highly conductive, which demonstrate that wood/Cu-F3G1/Ni was suitable for EMI shielding. The electromagnetic wave absorption value of the composite material reached more than −40 dB. With the increase in frequency, the absorption decreased, but the value was still above −35 dB.