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Pure nickel ferrite nanoparticles (NiFe 2 O 4  NPs) were prepared by the solvothermal method. Different concentrations of NiFe 2 O 4  were added to PVDF/PEO blend to prepare the PVDF/PEO-NiFe 2 O 4  nanocomposite films. The films were characterized using different techniques in detail. Pure NiFe 2 O 4  NPs images have a semispherical shape and roundness of the edges, with average particle size ~ 4.3–8.8 nm, and polycrystalline structure. Pure NiFe 2 O 4  NPs show that micrometrical agglomeration suggests the presence of pore-free crystallites on the surface. The spectroscopic techniques such as XRD, FTIR, and UV–visible have confirmed the interaction between PVDF/PEO and NiFe 2 O 4  NPs. Still, the nanocomposites exhibit a smooth surface with typical spherulitic clusters revealing the semi-crystalline structure of the PVDF/PEO-NiFe 2 O 4  nanocomposites. The values of  ε ′ and  ε ″ were increased as an increase of NiFe 2 O 4  due to the high value of dielectric permittivity of NiFe 2 O 4 . The appearance of semi-circles in the plot of  M ″ with Log confirms the single phase of the samples. The dielectric measurements show that  M ′ is inversely proportional to  ε ′. At higher temperatures,  M ′ levels off at frequencies higher than those at lower temperatures because the relaxation processes were spread over a range of frequencies. The values of saturation magnetization of PVDF/PEO-NiFe 2 O 4  films were linearly increased as an increase of NiFe 2 O 4  indicates improvement in the magnetic vector arrangement. Due to the enhancement of the magnetic properties, they can further exploit the films for magnetic applications.

Study of the spectroscopic, magnetic, and electrical behavior of PVDF/PEO blend incorporated with nickel ferrite (NiFe2O4) nanoparticles