Research On The Construction Of Conductive Stable Cellulose-based Flexible Transparent Film And Its Application In Flexible Electronic Devices

In the context of sustainable development and effective utilization of Green energy &environment,humans not only look at the immediate non-renewable energy,but also focus on the new green renewable biomass materials.Cellulose is a raw ecological green biomass material,which has the advantages of low application cost,easy access,simple production,environmental protection,degradability and so on.Cellulose based materials have relatively high safety performance.To a certain extent,the construction of cellulose based safety materials can also prevent material poisoning,battery explosion and other dangerous accidents.Therefore,cellulose has shown great potential in new functional materials and flexible electronic devices.It has shown great potential in the application fields of new functional materials and flexible electronic devices.Flexible,conductive film is one of the key components in diverse flexible electronic devices,such as display,organic thin film transistor devices,photovoltaic devices,and electronic skin.In the recent decades,indium tin oxide(ITO)films have been the most widely used transparent conductors due to their excellent electronic performances and optical transparency.However,brittleness,high cost,and a shortage of indium resource have limited the large-scale applications of ITO in flexible portable devices.In order to solve the problems in ITO materials,nano metal,polymer conjugated polymer,graphene and other materials have been developed for flexible conductors.With excellent electrical and optical properties,as well as rich ductility,silver nanowires(Ag NWs)have been widely used to prepare conductive,flexible films for a variety of devices.However,due to the poor oxidation resistance of Ag NWs,simple interface contact with non-degradable matrix such as polyacrylamide,polyurethane,polydimethylsiloxane(weak interface bonding)and other defects,it has strong impact on the electrical properties of Ag NWs-based flexible conductors and the service life of device.Therefore,using Ag NWs as the conductive network,it is still a big challenge to construct strong interface bonding mode and conductive films,which has the properties in strongly antioxidant,degradable,flexible and transparent.In this experiment,the regenerated cellulose hydrogel was used for the first time as a direct filtration matrix.The silver nanowire(Ag NWs)was used as the intermediate conductive network.The conductive polymer poly(3,4 ethylene two thiophene)polystyrene sulfonate(PEDOT:PSS)acts as a conductive stabilizer and has oxidation resistance.The integrated strategy of interface embedding-interface coverage,Ag NWs regenerated film,and PEDOT:PSS are combined to generate degradable conductive film(CRC film).Above all,Ag NWs is in the between regenerated film and PEDOT:PSS.The conductive film constructedby this strategy has good flexibility,transparency,high electrical conductivity and electrical stability.Even when subjected to conditions such as exposure to a hostile environment of90 % relative humidity of and 65 o C temperature for up to 60 days,repeated bending for 500 times,peeling over 400 times or soaking in water for 30 days,the film still exhibits a high and stable conductivity of 11.3 ? sq-1.More importantly,With this conductor,we demonstrate a flexible,transparent and biocompatible strain-to-electricity sensor and micro-supercapacitor devices with the high working stability and performance.