Research On Sensing And Energy Harvesting Devices Based On Fiber

The Internet of Everything is the core essence of the Internet of Things in the current information age,and it has a very wide range of applications in the fields of artificial intelligence and bio-intelligent medical care.The Internet of Things requires a large number of miniaturized and intelligent sensing nodes.However,supplying energy for such sensing nodes is a problem that cannot be ignored.Therefore,research on energy harvesting technology for micro-miniature sensor devices has gradually become one of the current research hotspots in the field of electronic science and technology.The key core of the in-depth development and application of integrated devices for sensing and energy harvesting is to solve two important problems: 1,Flexible for wearable;2,Functional integration.In view of the above difficulties,through the optimization of the micro-fabrication manufacturing process,the mechanism analysis and structural design of the multi-functional integration of the device,and the test,comparison and optimization of the performance parameters,this thesis realizes a fiber-type sensor that integrates temperature sensing and energy harvesting.The main research contents of this thesis include the following four aspects:（1）Based on the basic working principle of thermoelectric generators and the properties of related materials,P-type organic thermoelectric material-PEDOT: PSS and fiber-type structures were finally selected as the research designed scheme in this thesis.Based on the principle of thermoelectric effect and warp and weft weaving structure,a fiber-type device that integrates temperature sensing and energy harvesting is designed.（2）The preparation of fiber-type sensing and energy harvesting devices was realized based on the solution dip dyeing method.At the same time,the relevant optimization process was designed for the key parameters of the device during the preparation process,and the conductivity of the device and the resistance to electrode embrittlement were optimized.The final conductivity reaches 300 S/cm,and the electrode brittle crack resistance reaches 1500 times.（3）Based on the principle of thermoelectric effect,through the temperature sensing test of the device,the linear response process of the device with the temperature change process is analyzed,and then the sensing ability of the device to temperature is realized.In addition,through the sensing stability test,it is proved that the device has good temperature sensing stability.（4）Through the related output performance test of the fiber-type device,it is proved that the device has good thermoelectric characteristics and excelent output stability.The fiber-type sensing and energy harvesting device based on 100 pairs of thermoelectric units achieves an output of about 40 m V.Finally,through the designed back-end energy storage circuit,the power supply capacity of about 1.2 V is realized.