| Flexible sensors are influential emerging research hotspot in the fields of fine/vibration detection,human motion/health monitoring,wearable electronic skin,human-machine interface,intelligent soft robot and so on,and have broad application prospects.Although various sensors have been developed to meet this growing demand,it remains a huge challenge to produce flexible sensors with high sensitivity and superior stability cheaply,quickly and efficiently.Microelectronic printing is a technique in which conductive ink is deposited directly onto a stretchable substrate.Since microelectronic printing patterns are digitally generated and can be changed dynamically,inkjet printing technology is a good choice for fabricating flexible sensors.In this paper,microelectronic printing method was used to deposit the metallic silver layer on a planar or surface microstructured polyurethane acrylate(PUA)substrate to form a flexible electrode.The flexible planar electrode was used to fabricate PUA/Ag monolayer strain sensor,and the planar electrode combined with the electrode with microstructure was used to fabricate PUA/Ag double-layer pressure sensor.Main research contents:(1)Research on microelectronic printing process and heat treatment process.Use of UV-curing PUA basal material,preparation of recycled microelectronic printing technology in the PUA basement of microelectronic printing silver electrode,studies the inkjet printing process parameters including temperature,substrate temperature,the ink drops,such as the effect of process parameters on drops connection state and heat treatment temperature and heat treatment time and so on post-processing technology on the influence of the conductivity electrode materials.On this basis,a PUA/Ag monolayer strain sensor was prepared by encapsulating the printed PUA/Ag electrode material with PDMS film.A PUA/Ag electrode material with microstructure was prepared by microelectronic printing technique.A PUA/Ag doublelayer pressure sensor was fabricated by PDMS encapsulation.(2)Mechanical properties of flexible sensors and the establishment of electrical signal conversion platform.Aiming at the problem that the traditional measuring instrument is difficult to meet the high precision acquisition,a flexible sensor electromechanical signal conversion platform is built by using virtual instrument technology.Using the data acquisition card and its connected circuit as the hardware system,using Lab VIEW programming to build the upper computer interface display function and the underlying logic block diagram collection and preservation function as the software system,the flexible sensor electromechanical signal conversion platform based on the combination of data acquisition card and Lab VIEW is built.(3)Study on performance and application of PUA/Ag single-layer strain sensor.The sensitivity,hysteresis,repeatability and response time of PUA/Ag single-layer strain sensor are studied.A PUA/Ag single-layer strain sensor was used to measure the pulse signals of human body under different conditions,including normal state,after intense exercise,hunger state and after meal.It is proved that the sensor has certain application value in health monitoring and medical diagnosis.(4)Study on performance and application of PUA/Ag double-layer pressure sensor.On the PUA substrate,the surface microstructure was introduced,and the PUA/Ag electrode material with microstructure was prepared by inkjet printing technology.A PUA/Ag double-layer pressure sensor was fabricated by PDMS encapsulation.The influence of the size of microstructure on the sensitivity and linearity of the sensor is studied.The sensor can be used to test a number of real-life scenarios,including wearing a mask to monitor a person's breathing state,it is pressed against the throat to detect vibrations in the throat to identify speech,it can monitor the vibration state of mobile phone in real time.It is proved that PUA/Ag double-layer pressure sensor has sensitive response to small pressure. |
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