Abstract
Pomegranate-like polypyrrole-coated NiFe2O4 ferrite (PPY@NiFe2O4) nanospheres were prepared and used as functional fillers within dielectric electroactive polymer poly(vinylidene fluoride) (PVDF) matrix. The microstructure of PPY@NiFe2O4 ferrite was characterized by Raman spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) and transmission electron microscope (TEM). The interface interaction of PPY@NiFe2O4 nanofiller and PVDF matrix was stronger than that of pure NiFe2O4 and PVDF matrix. The difference of interface interaction between nanofiller and polymer matrix were simply illustrated by a mechanism schematic. The dielectric and magnetic properties of PVDF composites were investigated. Compared to the pristine NiFe2O4/PVDF composites, the PPY@NiFe2O4/PVDF composites presented enhanced dielectric constant and lower dielectric loss.
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