Improved dielectric strength of barium titanate-polyvinylidene fluoride nanocomposite

Barium titanate-polyvinydene fluoride nanocomposites with improved dielectric strength were prepared, in which on the surface of the barium titanate nanoparticle was coated. The results showed that the dielectric breakdown strength of the nanocomposites increase significantly up to 250 kV/mm and then decrease. Microstructural investigations revealed that the coated barium titanate nanoparticles were well-dispersed in polyvinydene fluoride. Fourier transform infrared spectroscopy confirmed that there is a large coverage of cross-linking in both interfaces of the barium titanate-titanate and the titanate-polyvinydene fluoride, which can connect the composites to form an organically integrated body, which result in the increase of the dielectric strength of the nanocomposites. (C) 2009 American Institute of Physics. [doi:10.1063/1.3242004]