Scale-up Preparation Of Fiber-based Triboelectric Nanogenerator And Self-powered Sensing Applications

With the development of the Internet of Things and artificial intelligence,textile materials are no longer limited to the traditional functions of protection,warmth and aesthetics,but have been given more intelligent attributes.With the development of wearable devices,electronic devices are becoming more and more highly integrated and miniaturized.By combining triboelectric nanogenerators with textile elements,various functional devices can be designed into textile structures.In contrast,fiber-based triboelectric nanogenerators have the unique advantage of being structurally designed to be integrated into different textile structures for energy harvesting and self-powered sensing functions.In this thesis,fiber-based triboelectric nanogenerators with single-electrode core-shell are prepared on scale by different processes.The mechanical and electrical properties of the fiber-based triboelectric nanogenerators with single-electrode core-shell are investigated,and the applications in self-powered sensing are explored,respectively.(1)In this thesis,braided core-shell fiber-based triboelectric nanogenerators with uniform thickness and continuous length are prepared by braiding polyvinylidene fluoride yarns onto silver-plated nylon yarns.This braided coreshell structured fiber-based triboelectric nanogenerator has good mechanical properties and can be further integrated into two-dimensional textiles with different structures(e.g.,woven and knitted)by textile technology for energy harvesting and self-powered sensing functions.The two-dimensional woven textile-based triboelectric nanogenerators can light up about 116 LEDs and can be used to harvest biomechanical energy.Two-dimensional knitted textile-based triboelectric nanogenerators are integrated with ordinary socks to construct a sensing system for plantar pressure detection and explore its plantar pressure distribution during different yoga postures,which has great potential for application in the field of human motion detection.(2)In this thesis,a continuously producible single-electrode chitosan-based core-shell fiber-based triboelectric nanogenerator is prepared using electrospinning cored yarn technology.It is prepared by preparing chitosan into chitosan nanofibers and then wrapping them uniformly on a conductive silverplated nylon yarn.The chitosan is extracted from the waste shrimp shells by chemical experiments,which realized the reuse of the waste shrimp shells.The chitosan-based core-shell fiber-based triboelectric nanogenerator prepared is ultra-light and finer and has good flexibility,which can withstand a heavyweight of 200 g without breaking.In addition,the chitosan-based core-shell fiber-based triboelectric nanogenerator can be integrated into fabrics for self-powered sensing switches,which has great application prospects in the field of smart homes.