Preparation and Properties of Fe3O4/PVDF Composite Piezoelectric Membrane
In this paper,Fe3O4/PVDF composite piezoelectric membranes with uniform pore structure were prepared by com-bining Fe3O4 magnetic nano-powder with the freeze-drying membrane making process of polyvinylidene fluoride(PVDF)using the synergistic effect of Fe3O4 magnetic nano-powder and magnetic field.It is found that the addition of Fe3O4 magnetic nano-powder not only improve the pore structure of the piezoelectric membrane,but also induce the directional formation of polar β crystals of PVDF,in which the proportion of polar crystals reaches 85%when 2-4wt%doping.At the same time,Fe3O4 doping enhances the output voltage of the piezoelectric membrane,in which the peak output voltage could reach up to 26.4 V at 2wt%doping,which is 8.5 times higher than that of the pure PVDF piezoelectric membrane.The results show that Fe3O4/PVDF composites a have broad application prospect in mechanical energy harvesting and motion sensing technology.
万方数据
