Preparation Of Flexible Nanogenerator And Its Application In Self-powered Ultraviolet Sensor

With the rapid development of science and technology,flexible electronics are widely studied in many areas,such as wearable electronics,implantable electronics and artificial skins.Power supply device plays an important role in flexible electronics,the critical procedure of realization of flexible electronics is to achieve appropriate flexible power supply device.Hence,to study flexible power supply technique is very meaningful for the application and development of flexible electronics.In this dissertation,the main works focus on improving the reliability and output performance of flexible nanogenerator(FNG)and its application in self-powered UV sensor.The reactive ion etching(RIE)was utilized to make a PDMS protective layer for fiber based ZnO nanowire arrays,which can substantially improve the robustness of the hybrid structure.And then,the enhanced fiber based ZnO nanowire arrays were woven into a high reliability fiber based piezoelectric nanogenerator,whose output can still keep stable after 3600 s severe mechanical driving test.With the assistance of Faraday cage,the RIE was utilized to fabricate oblique nanowire arrays on polymer films,whose obliquity can be accurately controlled from 0° to 90°.This approach can be applied to fabricate oblique nanowire on different polymers.The oblique nanowire arrays were firstly used to improve the output performance of triboelectric nanogenerator(TENG).Compared with the conventional vertical nanowire array,the open-circuit voltage,short-circuit current and inductive charges were improved by 73%,150% and 98%.The couple of inclined lithography and replica molding were adopted to fabricate oblique PDMS microrod arrays on fabric.The oblique PDMS microrod array was used to enhance the output performance of wearable TENG,the output voltage,current and instantaneous power can reach 1014.2 V,51.9 ?A and 3.4 mW,respectively.The nylon and dacron fabrics were used to fabricate freestanding triboelectric-layer-based TENG,which can harvest the mechanical energy of contact-separation driven mode and lateral sliding driven mode without the limitation of the triboelectric layer.In the fabrication process of TENG,we fabricated nanowire arrays on the fabric surface to enhance the contact area of TENG,and the fluorinated surface modification by plasma etching was conducted to improve the ability of gaining electrons.Finally,fiber based FNG and fiber based UV sensor were connected in series to form a self-powered system which can detect the UV intensity from 5 mW/cm2 to 12 mW/cm2,quantitatively.In addition,the output of FNG can be adjusted by changing the carrier density of ZnO nanowire in different UV intensities,the fiber based FNG can act as a self-powered UV sensor.