Dual functionalized Janus structural PVDF nanocomposite with surface-modified dielectric and magnetic nanoparticles o

摘要

Optimizing the combination of dielectric and magnetic properties has become an important issue for electrical and electronic devices. Compared to single-function materials, multifunctional materials have the advantages of increasing device response speed, reducing costs, and increasing stability while reducing the device size. In this work, Janus structure polyvinylidene fluoride (PVDF) composites filled with barium titanate (BT) and cobalt ferrite (CFO), respectively, were prepared by electrospinning and hot pressing techniques. The Janus structural composites (J-type) have higher magnetic and dielectric properties than the conventional blended fibrous composites (H-type). When the PVDF matrix was replaced by polystyrene, the effect of Janus structure on dielectric and magnetic properties was even more pronounced. An optimum dielectric constant up to 25.1 and a saturation magnetization of 7.12 emu/g were obtained, which can be attributed to the modification and Janus structure of m-BT/PVDF+m-CFO/PVDF multifunctional composite materials.