Research And Application Of Wearable Electronics Based On Triboelectric Nanogenerators

Triboelectric nanogenerator(TENG)is an efficient mechanical electrical energy conversion method based on the coupling effect of contact electrification and electrostatic induction.Triboelectric nanogenerators have been widely used in the design of sustainable power supply and self-powered sensors because of a series of attractive characteristics,including light weight,low cost,flexible design structure,wide selection of materials and high-performance output at low operating frequency.Therefore,it is necessary and valuable to study the working principle,performance improvement methods and application of TENG.Firstly,based on the study of the basic structure and working principle of triboelectric nanogenerator,this thesis investigates and discusses the effect of using effective physical and chemical methods to improve the output performance of TENG.Then,a novel structure of high-performance and portable TENG is explored and designed.Moreover,the fiction material selection,device structure optimization and surface electron distribution are analyzed respectively.A handheld triboelectric nanogenerator based on rotational dynamics is designed,which not only meets the basic working conditions of TENG,but can transform the linear motion of human hand into a built-in rotor as well.The rotary motion of the device is finally converted into electrical energy output,which can realize the utilization of low-frequency linear biomechanical energy through the rotation of the rotor of the device,providing a research basis for the handheld portable TENG as a sustainable power supply for wearable devices.Secondly,the structure optimization and output performance of the designed portable triboelectric nanogenerator are also studied.By building the experimental platform,the output voltage,output current and output power of TENG are measured,which verifies that the portable TENG device has the possibility of being used as the power supply for wearable devices.Under the condition of the same design structure,this thesis also designs experiments to explore the influence of increasing the number of vanes in friction rotor on the output performance of the TENG.The results show that under the same structure design,increasing the number of friction rotor blades will reduce the output voltage and increase the output current of TENG,which provides experimental basis for the subsequent reasonable optimization of device structure and the design of the most efficient portable triboelectric nanogenerator.Thirdly,based on the characteristics of low design cost,high output performance,portability and simple working mode,the application of TENG in wearable electronic power supply system is studied.First,an experimental platform was built to collect the low-frequency linear biomechanical energy from the designed portable triboelectric nanogenerator through capacitors with different capacities.Then,the rectifier circuit is designed to supply power for the wearable intelligent sports Bracelet by using the designed portable triboelectric nanogenerator.In the end,this thesis verifies that the triboelectric nanogenerator design can not only supply power but work as a self-powered biosensors for monitoring human respiratory.The test shows that the designed TENG device can operate stably and meet both the practical powering and sensing application requirements.