Flexible Transparent Electrodes:Design,Preparation,Functional Regulation And Application

Flexible and stretchable electronic devices are widely used in flexible energy storage devices,electronic skin,health monitoring and other fields due to their advantages of bendability and high flexibility,which have attracted close attention from academia and industry.As an important component of flexible and stretchable electronic devices,electrodes have a huge impact on device performance.Currently,the most widely used transparent electrode is indium tin oxide（ITO）transparent electrode.Due to its cumbersome production process,high manufacturing cost,brittle texture,and poor flexibility,it cannot meet the development needs of flexible and stretchable electronic devices.In view of this,this paper focuses on the design and preparation,performance regulation,and process exploration of new flexible transparent electrodes,and conducts research on simple and low-cost preparation of high-performance flexible transparent electrodes to replace traditional ITO transparent electrodes,so as to promote the development of flexible and stretchable electronic devices.The main research contents of this paper are as follows:1 This work used a simple and low-cost inkjet printing technology to design and fabricate the high-performance wavy silver grids stretchable transparent electrodes.The optoelectronic properties of the electrodes were regulated by the number of composite conductive film layers,the line width and line spacing of the silver grids(Rs:29.85Ωsq^-1,T:81.94%),the combination of the corrugated design and the highly elastic substrate achieved excellent mechanical flexibility and stretchability of the electrodes（tensile strain of 100%）.Using a one-step transfer process,the corrugated silver grids were embedded in the PDMS elastic substrate surface,which enabled the electrodes to have excellent oxidation resistance.The stretchable transparent electrodes are replacing the traditional ITO transparent electrodes and provide a feasible technical solution for the innovation of flexible and stretchable electronic devices.Strain sensors were fabricated based on the resultant stretchable transparent electrodes,which exhibited high sensing sensitivity and stress-strain responsing performance.When the stretchable transparent electrodes were used as biological electrodes,they showed excellent detection ability in ECG signal and EMG signal.The resultant stretchable transparent electrodes have broad application prospects in wearable electronic devices,health monitoring systems and other fields.2 In this work,the high-performance Ag NWs/MXene/PEDOT:PSS flexible transparent electrodes were developed using the multi-layer spin-coating all-solution process.The composite strategy of MXene and PEDOT:PSS effectively reduced the line height of Ag NWs;Ag NWs improved the electrical conductivity of MXene and PEDOT:PSS;PEDOT:PSS improved the oxidation resistance of Ag NWs and MXene.The regulation mechanism of the number and concentration of conductive material layers was established to further optimize the optoelectronic properties of the flexible transparent electrodes(Rs:15.03Ωsq^-1,T:74.5%);the combination with the highly elastic PDMS substrate endowed the electrodes with good bending resistance It has great potential in replacing traditional ITO transparent electrodes in the field of flexible electronics.Based on the developed high-performance flexible transparent electrodes,flexible translucent supercapacitors were constructed,which exhibited excellent electrochemical performance.The resultant flexible transparent electrodes provide an important reference guide for future applications such as smart windows and flexible transparent energy storage devices.