Abstract
SnO2 nanoparticles with an average diameter of about 4 nm were coated on the surface of BaTiO3 (BT) (∼100 nm) by chemical treatment. With the introduction of BT@SnO2, the dielectric permittivity of poly(vinylidene fluoride) (PVDF) composite was significantly increased to 90 at 103 Hz, which is ∼40% higher than that of the BT/PVDF composites. It was attributed to the enhanced interfacial polarization in the interlayers between BT and PVDF due to the addition of SnO2 nanodots. The distance of SnO2 nanodots on the adjacent BT surfaces is close enough for the electron transport in the matrix by tunneling effect. Besides, the semiconductive SnO2 leads to the weak insulating-conducting transition close to the percolation threshold.
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