$BaTiO3$-carbon nanotube/polyvinylidene fluoride three-phase composites with high dielectric constant and low dielectric loss

A three-phase composite with multiwall carbon nanotube (MWNT) and $BaTiO3$ particles embedded into polyvinylidene fluoride (PVDF) was prepared. The uniform dispersion of fillers was realized, and the dielectric constant was as high as 151 at $102Hz$ when the volume fraction of MWNT and $BaTiO3$ were 0.01 and 0.15, respectively. The $BaTiO3$-MWNT/PVDF composite with high dielectric constant displayed relatively low dielectric loss and good flexibility due to the low concentrations of MWNT and $BaTiO3$⁠. The results can be explained by the space charge polarization at the interfaces between the conductor and the insulator and the evolutions of conductive pathway and microcapacitance structure.