Dielectric properties and charge storage optimization in poly(vinylidene fluoride) polymer matrix hybrid nanocomposites with BaTiO3 and multi-walled carbon nanotubes

摘要

Polymer matrix hybrid nanocomposites featuring uniformly dispersed barium titanate (BT) nanoparticles and multi-walled carbon nanotubes (MWCNT) in the poly(vinylidene fluoride)(PVDF) were fabricated by miscible-immiscible coagulation method followed by hot pressing. Dielectric properties of the polymer matrix hybrid nanocomposites were improved using a MWCNT content near the electrical percolation with consequent optimum synergistic effects between the charge storage effects of the ferroelectric phase and the charge transport effects of the conductive phase. The real permittivity was 71.7 and the dielectric loss was 0.046 at 1 kHz for composites containing 37.2 vol % of BT and 3 vol % of MWCNT. Due to the simplicity of the processing method, reliable dielectric properties and flexibility, this composite may be useful in many electronic applications such as high energy density capacitors and flexible high-k dielectrics.