High dielectric performance of three-component nanocomposites induced by a synergetic effect

Nanosized BaTiO3 (NBT) was introduced into multi-walled carbon nanotube (MWNT)/poly(vinylidene fluoride) (PVDF) composite with fixed MWNT loading to explore the effect of secondary ceramic filler on dielectric properties of three-component composite. The dielectric constant of (NBT-MWNT)/PVDF composite was enhanced significantly (338 -> 637) while the AC conductivity was decreased (7.75 x 10(-3) Sm-1 x 10(-4) Sm-1) when the volume concentration of NBT was increased up to 020. The reason can be the space charge polarization nature and a synergetic effect of NBT/MWNT loading. This can be further confirmed by using an equivalent circuit model to analyze the impedance data. (C) 2010 Elsevier B.V. All rights reserved.