Nano-Fe_3O_4 deposited CaCu_3Ti_4O_(12)/poly(vinylidene fluoride) composites with enhanced dielectric properties

摘要

In this paper, calcium copper tianate (CCTO) ceramics were prepared by a sol-gel technology, then Fe_3O_4-deposited CCTO hybrid particles (CCT0@Fe_3O_4) and corresponding CCTO@Fe_3O_4/poly(vinylidene fluoride) (PVDF) composites were also prepared. Transmission electron microscope image shows that Fe_3O_4 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 x 10~(-7) S/m) at 100 Hz were simultaneously achieved when the content of CCT0@Fe_3O_4 was 40 vol%. The electric modulus formalism indicated that the Fe_3O_4 nanoparticles could effectively enhance the interfacial polarization of the CCT0@Fe_3O_4/PVDF composites. Moreover, the structure of the CCT0@Fe_3O_4 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.