Nano-Fe3O4 deposited CaCu3Ti4O12/poly(vinylidene fluoride) composites with enhanced dielectric properties

Abstract

In this paper, calcium copper tianate (CCTO) ceramics were prepared by a sol–gel technology, then Fe3O4-deposited CCTO hybrid particles (CCTO@Fe3O4) and corresponding CCTO@Fe3O4/poly(vinylidene fluoride) (PVDF) composites were also prepared. Transmission electron microscope image shows that Fe3O4 nanoparticles with a certain degree of agglomeration deposited on the surface of CCTO powders. The high dielectric permittivity (115.8), low dielectric loss (0.48) and low conductivity (3.47 × 10−7 S/m) at 100 Hz were simultaneously achieved when the content of CCTO@Fe3O4 was 40 vol%. The electric modulus formalism indicated that the Fe3O4 nanoparticles could effectively enhance the interfacial polarization of the CCTO@Fe3O4/PVDF composites. Moreover, the structure of the CCTO@Fe3O4 particles effectively suppressed the formation of conducting path in PVDF matrix, resulting in a high dielectric permittivity, a low dielectric loss and a low conductivity of the composite. All the above-mentioned properties are beneficial for the use of these composites in the electronics industry, for applications such as printed circuit boards.