Preparation Of Polyvinylidene Fluoride-based Multiferroic Copolymer Films And Its Performance Study

Ferroic material is a very significant class of functional materials, which is widelyused in electronic devices transducers, sensors, memory, etc. It also plays animportant role in the high-tech field, such as sensing, drive, storage, intelligentsystems. Device miniaturization, various forms of modern productions and livingmaterials make multifunctional materials raise more and more attention. Multiferroicmaterials are the typical one of this kind of materials. Multiferroic materials can notonly make controllable transformation and collaboration between different physicalproperties reality, but also can produce new effects and functionality throughsynergistic coupling of material components, which greatly expands the applicationof the iron material. The discovery of such materials makes the conversion betweenmagnetic fields and electric fields directly, without using other sophisticatedequipment. The essence of this conversion is the direct conversion of two kinds ofenergy which provides enormous potential application in development based onferroelectric-new magnetic information storage processing and integration effectsmagnetic electrical parts and other technology.This paper aims to study the preparation, structure and properties of a class of bothferroelectric and ferromagnetic properties of flexible multiferroic composite films andnano-scale organic-inorganic hybrid multifunctional coupling effect. Ferroelectricpolymer PVDF and copolymer P(VDF-HFP) with excellent electrical activity wereused as the ferroelectric substrate. And the carbon nanotube-cobalt ferritenanomaterials (CNT-CoFe2O4) having a specific size and surface activity weresynthesized. Nano-size effect of CNT-CoFe2O4induced polymer matrix forming aferroelectric crystal structure with higher electrical activity. Through the ferroelectricpolymer matrix and ferromagnetic CNT-CoFe2O4were composited, ferromagneticCNT-CoFe2O4evenly dispersed in ferroelectric polymer matrix and a goodcombination of inorganic and organic facies was realized, thereby new multiferroicmagnetic thin film materials were prepared with both ferroelectric and ferromagnetic.Ferrite nanoparticles were loaded to a specific size CNT forming ferromagneticCNT-CoFe2O4through coating technology. The influence of reaction conditions on the CoFe2O4load density and the magnetic were explored. thereby preparing goodferromagnetism, high saturation magnetization of CNT-2.5CoFe2O4(The amount ofsubstance ratio of CNT and CoFe2O4was1:2.5.). The ferromagnetic CNT-CoFe2O4and ferroelectric polymer PVDF copolymer P (VDF HFP) were prepared compsitefilms. Comparing with pure PVDF film, PVDF composite film of0.5wt%CNT-2.5CoFe2O4had the highest saturation magnetization and good ferromagnetic, andenergy storage density of7.05J·cm-3. P(VDF-HFP) composite film of1wt%CNT-2.5CoFe2O4had better ferromagnetism, excellent dielectric properties than P(VDF-HFP) film, and energy storage density of7.67J·cm-3.