Preparation And Performance Of Flexible DC Piezoelectric Nanogenerato

In recent years,the continuous development of intelligent micro-electronic devices can change the future through the microwatt level of electricity,miniaturization,persistence,portability and multi-function of these devices will become an important development direction of electronic devices and accessories system.The rise of flexible piezoelectric nanogenerators has largely promoted the development of this field,but the existing piezoelectric generators output AC power,still needs to be connected to the rectifier to supply electrical appliances,which to some extent,improves the use space of electronic devices.In order to reduce the user space of the device,this paper uses the Schottky contact between semiconductor and metal to get the Nano generator which can produce direct current energy,realizing the self-rectifying effect of the Nano generator.Firstly,the flexible DC nanogenerator was prepared by compounding PPy and PP without piezoelectric properties.The study showed that with the increase of oxidant concentration,the load of PPy increased and then decreased.When the oxidant concentration was 2 mol/L,the yield of PPy reached the maximum.By manipulating the parameter,the optimal output voltage reaches 3.46V,the optimal output current reaches 31.97μA,and the optimal current density reaches 3.55μA/cm~2.Compared with pure PP non-woven fabric,the maximum output voltage increased by 401.45%,the maximum current increased by 7511.90%.Secondly,in order to improve the power output,the substrate was replaced with PVDF equipped with good piezoelectric properties.The study showed that the loading capacity of PPy increased with the increase of oxidizer concentration.When the polymerization time is 90 min and the oxidant concentration is 2 mol/L,the load of PPy is 4.89 mg/cm~2,and the optimal output voltage reaches 1.24 V,the optimal output current reaches 205.01μA and the optimal current density reaches 22.78μA/cm~2.Compared with pure PVDF,the voltage output is reduced and the current output is greatly improved.The final action was to replace with qualified piezoelectric substrate material of PAN.By manipulating the parameter,when the polymerization time is 120 min and the oxidant concentration is 1.5 mol/L,the voltage output reaches 1.11 V,the optimal output current reaches 123.24μA and the optimal current density reaches 13.69μA/cm~2.Meanwhile,the device can charge a 4.7μF capacitor to 0.5 V within 100 s at5 N stress.Although the method realizes self-rectification,the replacement of substrate material does not achieve efficient electric energy output.In this study,PPy was combined with a variety of flexible fabrics to successfully prepare a flexible piezoelectric nanogenerator with DC output.However,this method still has the disadvantage of small power output,which needs to be continuously studied and improved.In the future,it is of great significance and research value to use schottky rectifier junction to realize dc power output.