New Type Sensitive Material And Its Application In Flexible And Wearable Sensor

In recent years,flexible wearable sensors have attracted considerable research attentions for their substantial applications in healthcare monitoring,disease diagnostics,human-machine interaction,and smart robot prosthesis.Herein,the flexible,portable pressure sensor and humidity sensor has been reported,which can be integrated into flexible electronic equipment with a wireless transmitter for real-time monitoring the human-motion interactivities.The main contents and results of this paper are listed below:First,in this paper,a wearable ultrasensitive pressure sensor with hierarchically microstructured framework of microcrack and interlocking bioinspired,which is bioinspired from the crack-shaped mechanosensory spider systems and the beetles' wing-locking sensing systems,has been developed.Inspired from the crack-shaped mechanosensory spider systems,the microcracked reduced graphene oxide(C-RGO)sheets layers on the elastic three-dimensional(3D)polyurethane(PU)sponge network backbones(C-RGO@PU)were prepared by firstly supramolecular assembly of graphene oxide(GO)onto the functionalized hydrophilic PU sponge and subsequent in-situ reduction process.Inspired from the beetles' wing-locking sensing system and the interesting biological mechanosensing systems of reversible 'interlocking' of hairs,the conductive polyaniline nanohair(PANIH)arrays were coated onto the C-RGO sheets layers after the in-situ chemical oxidative polymerization of conducting polymers.It exhibits the widely full-range healthcare monitoring from 0.2%to 80%strain deformations,fast response/recovery time(22 ms/20 ms),high sensitivity,the ultrasensitive loading sensing of a grain of rice(25 mg),excellent reproducibility over 10000 cycles,and potential healthcare prediction of early stage Parkinson's disease with the imitated static tremor.Meanwhile,it can be assembled as smart artificial electronic skins(E-skins)for simultaneously spatial touching sensing mapping of pressure distribution and shape.Furthermore,it can be attached onto the legs of smart robot and coupled with a wireless transmitter for wirelessly monitoring the human-motion interactivities.It paves the way for bioinspired design of highly sensitive wearable pressure sensors for potential versatile applications in E-skins,personal healthcare monitoring,clinical diagnosis,and artificial intelligence.Second,the electrode on the flexible polyethylene terephthalate(PET)substrate has been printed using ink-jet printing technology,and by using macromolecular acid as template the water-soluble polyaniline was synthesized.Then the flexible humidity sensor has been fabricated by spin-coating the water-soluble polyaniline on PET.The flexible,wearable humidity sensor can monitor the exhaled air humidity from mouth,which has the potential to be integrated into the wearable equipment to the application of remote healthcare monitoring.