Research On Preparations And Performances Of Multifunctional Flexible Electronic Skins

In today's wearable technology field,polymers are the most promising materials because the polymers themselves have excellent flexibility.For over a decade,a large number of flexible stretchable electronic devices integrated with polymer substrates have demonstrated their ability to digitize physiological signals and medical monitoring.Device design,material selection,and processes for preparing bio-integratedelectronics have made great progress,providing new ideas for building clinical diagnostic and monitoring tools.These true"flexible electronic skins"?e-skins?are receiving more and more attention.However,due to the poor performance or single function of many flexible devices,the application scenarios of these sensors are relatively simple and cannot be used in real life.In this study,the multifunctionalization of flexible electronic skin was achieved from two perspectives by two methods.In response to the inevitable trade-offs and balances of pressure sensors in high sensitivity and wide test range,this work uses a common and inexpensive sandpaper template,introducing a"multi-level contact"mechanism that overcomes the above shortcomings and makes flexible pressure sensors ultra high sensitivity(2.5 kPa^-1 to1051 kPa^-1)which can be maintained over a wide test range?0.01-400 kPa?.Subsequent application studies for pulse,respiration,and foot pressure have demonstrated the advantages of multi-level structures and the potential application value of the versatility of the device by broadening the test range.Aiming at the single function of the flexible sensor,this work designed a flexible device based on polyaniline@fabric composite material through reasonable structural design and material selection,which not only can respond to pressure stimuli?0.3-30kPa?,but also has a good linear response to ammonia at room temperature.The most important feature is that our sensor can distinguish and identify the corresponding signals when the two stimuli act simultaneously.The above two design ideas are relatively simple and easy to implement,and the multifunctionality of the flexible device is realized from two angles.At the same time,the design method is also universal and can be extended to other types of flexible devices?such as temperature sensors and humidity sensors?.In the preparation of the product,it can inspire more researchers to prepare electronic skin with better performance and more diverse functions.