Cyanate Ester Resin Filled with Graphene Nanosheets and NiFe2O4–Reduced Graphene Oxide Nanohybrids for Efficient Electromagnetic Interference Shielding

An effective electromagnetic interference (EMI) shielding cyanate ester (CE) composite has been fabricated with a combination of graphene nanosheets (GNSs) and nickel ferrite (NiFe 2 O[Formula: see text] particles. NiFe 2 O 4 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–NiFe 2 O 4 in CE. Electromagnetic properties and EMI shielding effectiveness (SE) of the nanocomposites were determined over X-bands (8.2–12.4[Formula: see text]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[Formula: see text]dB for samples with thicknesses of [Formula: see text]2.7[Formula: see text]mm, which suggests that the GNSs/RGO–NiFe 2 O 4 /CE could be good candidates for highly efficient EMI shielding materials in the whole X-band.