Fabrication and enhanced characterization of copper powder filled copper calcium titanate/poly(vinylidene difluoride) composite

The dielectric composite ceramics copper calcium titanate/poly vinylidene fluoride (CaCu3Ti4O12/PVDF) with Cu powder as a modified agent are successfully prepared by solution mixing processing and hot pressing method. The relative dielectric constants of these composites are significantly enhanced with increase in the volume fraction of copper powder. These composites also possess stable frequency and thermal stability properties in the frequency range of 100–1 MHz. The dielectric permittivity of the 60 vol%PVDF/20 vol%CCTO/20 vol%Cu composite ceramics is higher two times than those with undoped Cu powder and reaches the maximum value of 135 (1 kHz) at Cu powder concentration of 20 vol%. The results indicate that using Cu powder as a modification agent can greatly enhance the dielectric permittivity of the ceramic–polymer composite and achieve high-stability for super capacitor applications.