Dielectric Properties of P(VDF-TrFE-CTFE) Composites Filled with Surface-Coated TiO 2 Nanowires by SnO 2 Nanoparticles

Nanocomposites containing inorganic fillers embedded in polymer matrices have exhibited great potential applications in capacitors. Therefore, an effective method to improve the dielectric properties of polymer is to design novel fillers with a special microstructure. In this work, a combination of hydrothermal method and precipitation method was used to synthesize in situ SnO nanoparticles on the surface of one-dimensional TiO nanowires (TiO NWs), and the TiO NWs@SnO fillers well-dispersed into the poly (vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) [P(VDF-TrFE-CTFE)] polymer. Hybrid structure TiO NWs @SnO introduce extra interfaces, which enhance the interfacial polarization and the dielectric constant. Typically, at 10 vol.% low filling volume fraction, the composite with TiO NWs @SnO shows a dielectric constant of 133.4 at 100 Hz, which is almost four times that of polymer. Besides, the TiO NWs prevents the direct contact of SnO with each other in the polymer matrix, so the composites still maintain good insulation performance. All the improved performance indicates these composites can be widely useful in electronic devices.