High dielectric properties of polymer-based ternary blend films using fillers’ synergy between asymmetrical Na-bearing OH–C60 and insulative diamond

Polymer/highly-conductive carbon composites are used as dielectrics. However, a high dielectric loss is induced by leakage current. In this study, ternary polymer composites with hydroxyfullerene and diamond were fabricated. Ternary composites exhibited more promising dielectric traits compared with polymer/hydroxyfullerene composites. A high dielectric constant was achieved using polar hydroxyfullerene. A significantly reduced dielectric loss was achieved owing to insulative diamond. Polymer/hydroxyfullerene interaction and branching of leakage current were studied. The best ternary composite showed a dielectric constant of ∼26 and dielectric loss of ∼0.21 at 20 Hz. This work may enable the large-scale fabrication of advanced dielectrics.