Study Of The Hydrothermal Progress Synthesised PMN-PT Nanowires And The Preparation Of Flexible Nanogenerator

Nanogenerator could convert dissipative environment energy to electrical energy which could be stored or drive micro devices directly through piezoelectric effect.Due to its brilliant function, Nanogenerator has been focus many years in the field of electron device manufacture and energy storage. The relaxor ferroelectrics(1-x) Pb(Mg1/3Nb2/3) O3-xPbTiO3(PMN-PT) with great piezoelectric properties proves to be good candidate for Nanogenerator. The PMN-PT nanowires were prepared by the hydrothermal progress which has the advantage of low consume, low cost and environment friendly in this paper. The PVDF and PMN-PT nanowires composite thin films were prepared by the tape casting method. The influences of the polyacrylic acid(PAA) content, hydrothermal temperature and reacting time on the morphology of the hydrothermal product were studied. The X-ray diffraction, scanning electron microscope, transmission electronic microscope, atomic force microscope, X-ray photoelectron spectrum were employed to detect the microstructure, piezoelectric and ferroelectric characteristics of the PMN-PT nanowire. The mechnical properties of the PVDF/PMN-PT thin films were measured by the mechanical property tester(Instron557). The output voltage and current was investigated by the Aglient 4155 C.PAA content, hydrothermal temperature and reacting time have great influence on the growth of the PMN-PT Nanowires. The adding of PAA could restrain the growth of the PMN-PT crystal in other crystal orientation, resulting PMN-PT nanowires with single crystal orientation. The hydrothermal temperature has the crucial effect on the crystal nucleus formation of the PMN-PT nanowires. The PAA content of 0.82 g/L, hydrothermal temperature of 235 oC and reacting time of 27 h should be the optimum hydrothermal reaction condition for preparing the PMN-PT nanowires. With the optimum hydrothermal reaction condition, the massive,well-distributed PMN-PT nanowires could be obtained. The piezoelectric constant of the single PMN-PT nanowire could be 423 pm/V. The coercive electric field,remanent polarization, spontaneous polarization and energy density of the singlePMN-PT nanowire is 2.78 kV/mm, 17.08 μC/cm2, 31.25 μC/cm2 and 18.70 J/cm3 respectively.The content of the PMN-PT nanowires has great influence on the mechanical properties and electric properties of the PVDF/PMN-PT Nanogenerator. When the mass fraction of nanowires less than 20%, the energy output properties of nanogenerator could be improved by the increasing of nanowire content. When the mass fraction of the nanowires arrives 20%, the PVDF/PMN-PT Nanogenerator has optimum output voltage 20 V and output current 60 nA. But, when the mass of the PMN-PT nanowires increased further, the energy output of the Nanogenerator decreased. Thus, the optimum of the PMN-PT nanowire mass fraction is 20%. After current rectificating, the direct-current could arrive 100 nA and could charge a capacitor.