Fabrication Of 1D Flexible Nano-electronic Devices And Their Sensing Application In Temperature And Humidity

Electronic devices based on flexible substrates have been attracted many attentions in wearable electronic devices due to their skin-attachable properties.In the meantime,nanostructure-based electronic devices have shown great potential in flexible wearable electronic devices on account of their high sensitivity,excellent mechanical properties and ultra-low power consumption.However,the preparation of nano-electronic devices based on flexible substrates is still a huge challenge that facing difficulties such as high manufacturing cost,complicated process and incompatibility with traditional processes.Based on above problems,nanomolding in capillary based on soft etching was utilized in this thesis.One-dimensional ordered conductive polymer nanowires arrays were successfully fabricated on flexible substrates.The width of nanowire is about70 nm and the array area is as large as 1 cm×1 cm.Under nanoscale limitation,the sensing properties of the material are further stimulated.The device responds quickly to humidity and temperature after the nanowires array is integrated into an electronic device,which demonstrated its great potential as a wearable humidity or temperature sensor.The key research contents and results include:1.Ordered one-dimensional poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid)(PEDOT: PSS)nanowires array and Graphene Oxide(GO)doped PEDOT: PSS nanowires array were successfully fabricated on flexible substrates such as polyethylene terephthalate(PET).All arrays exhibit extremely high uniformity,demonstrating the universality of the technique for preparing functional material nanowires array on flexible substrates.2.The flexible temperature sensor was successfully fabricated based on the GOdoped PEDOT: PSS nanowires array.The temperature sensing mechanism of the sensor was studied and the mechanism of its fast response was explained.Its great potential in health monitoring was verified by detecting human body temperature precisely.3.The flexible humidity sensor was successfully fabricated based on the PEDOT:PSS nanowires array.The humidity sensing mechanism of the sensor was studied and the mechanism of its fast response was explained.The mechanical properties of the sensor were also tested and analyzed.Then the humidity sensor was demonstrated to monitor human respiration in real-time.Through design and manufacture of the printed circuit board and the design of APP,the sensor was successfully integrated into a wireless wearable respiration detection system that can interact with mobile terminals in real-time through Bluetooth,which further verified its great potential in mobile health monitoring.