Electromagnetic Interference Shielding Performance of Ionic Liquid Modified Carbon Black and Graphite in Polyvinylidene fluoride at Ku-Band

In this study, carbon black and/or graphite incorporated with polyvinylidene difluoride (PVDF) composites giving sufficiently high electromagnetic shielding properties at microwave frequencies are synthesized. Micro-scale carbon black and graphite particles are modified by ionic liquid to improve interference shielding properties of PVDF based composites. The negatively charged carbon black and graphite particles are interacted by positively charged imidazolium ring to form ion pairs being embedded in PVDF. The effects of nanoscale hematite, magnetite, maghemite and silver nanoparticles (AgNps) on carbon black incorporated PVDF, graphite incorporated PVDF, and performances of carbon black-PVDF/graphite-PVDF double-layer composites are investigated for the frequency range of 12-18.4 GHz at Ku-band. Among all the composite samples each having 4 mm thickness, double-layer samples exhibit the strongest EMI shielding effectiveness by giving up to 35 dB at minimum in the given frequency range.