The Study Of Self-powered Gustation Electronic-skin

Sensation plays a crucial role in human behaviors interacting with the external environment.The emerging artificial sensory systems,e.g.electronic-skin(e-skin),can mimic human sensory organs and output biomarker signals.Recent efforts on flexible skin-surface,-implanted or-patched sensors have mostly been devoted to monitor human body activities and health.Taste bud is a special receptor on tongue surface among the various sensory receptors in the human body,which can taste flavor and transmit sensing information to the brain.The gustation e-skin can distinguish food,transmits sensing signal into nervous system and participates in gustatory perception,which could probably help the handicapped patients.Recently,some gustation substitution systems have been reported on traditional sensors.However,these systems need bulky external electricity source,which raises the production cost and also restricts the promotion of the integrated flexible artificial gustation system.Therefore,it has great significance to develop a self-powered multi-functions e-skin for gustation sensory substitution.The e-skin has good flexible and biocompatibility.Multiple flavor recognition has been realized based on multi-unit integrated on the same e-skin.What's more,the e-skin can work steadily for a long time through transforming human mechanical energy to electric energy without external electricity source.In this paper,a new self-powered brain-linked biosensing e-skin has been realized,which can actively identify beverage flavor.The e-skin connects and transmits signals to specific brain area without external electricity source,which realizes self-powered function.This low-cost technique can accelerate the development of artificial gustation and battery-free human-machine interaction systemSpecific studies are as follows:(1)A self-powered e-skin was fabricated by micromachining technology and electrochemical polymerization.A piece of Cu foil is formed a copper network after photolithography and wet-etching.Then PDMS mixture was spin-coated on the copper network and dried in vacuum at 90?.Surface treatment of PDMS was conducted by inductively coupled plasma.After that,Ppy was polymerized on copper by an electrochemical workstation.At last,enzyme solution was dropped on sensing unit and dried in fume hood.(2)The self-powered e-skin can detect pH value and alcoholicity of solution.When the pH sensing unit tests acid solution,the outputting current signals decrease as pH value decreases.When the pH sensing unit tests alkaline solution,the outputting current signals increase as pH value increases.When the alcohol sensing unit tests alcoholic solution,the outputting current signals decree as the concentrations of alcohol solutions increase.(3)The working mechanism had been explained based on triboelectrification and biosensing coupling effect.In pH sensing process,the chains structure of Ppy is changed by H+ and OH-in solutions,which change the outputting current.In alcohol sensing process,due to the enzymatic-reaction of alcohol oxidase,alcohol is decomposed into acetaldehyde,H+and oxygen.The chain structure of Ppy is changed by H+,which change the outputting current.The outputting current can directly show the pH value and alcohol concentration of solution.(4)The self-powered e-skin can test the pH value and alcohol concentration of daily beverages and connects brain.The self-powered tasting electronic skin detects pH and alcohol concentrations in apple vinegar,Chinese tea,Chinese liquor and beer.The outputting signals are transmitted to the primary motor cortex of the mouse brain to realize the self-powered e-skin to control the behavior of the mouse.The mouse brain can be stimulated by impulses and process this information to guide the behavior,e.g.leg movement under anesthesia.