▎ 摘　　要

An effective electromagnetic interference (EMI) shielding cyanate ester (CE) composite has been fabricated with a combination of graphene nanosheets (GNSs) and nickel ferrite (NiFe2O4) particles. NiFe2O4 particles were loaded on the reduced graphene oxide (RGO) to improve the dispersibility while the composites were synthesized via solution blending method. Scanning electron micrographs (SEM) showed good dispersion of GNSs and RGO-NiFe2O4 in CE. Electromagnetic properties and EMI shielding effectiveness (SE) of the nanocomposites were determined over X-bands (8.2-12.4 GHz). It was observed that the EMI shielding performance of composites was improved by increasing the filler loading of composites and absorption was found to be the dominant shielding mechanism. The total EMI SE is almost reaching 50 dB for samples with thicknesses of similar to 2.7 mm, which suggests that the GNSs/RGO-NiFe2O4/CE could be good candidates for highly efficient EMI shielding materials in the whole X-band.