Preparation And Optimization Mechanism Of AgNW@Metal Oxide Flexible Transparent Electrode

Flexible devices are one of the important directions of future electronic technology development.As a key component of flexible devices,flexible transparent electrodes must have good conductivity,light transmittance and stability at the same time.In recent years,silver nanowire-based transparent conductive films have attracted extensive attention due to their excellent conductivity and flexibility.In this paper,we prepared silver nanowire-based flexible transparent electrodes with excellent photoelectric performance,high stability and flexibility by introducing different metal oxides and polymers.The main contents and conclusions are as follows:（1）We prepared silver nanowires with high aspect ratio by hydrothermal method,and introduced Mo O_xto improve the stability of flexible Mo O_x/Ag NW/Mo O_xtransparent electrode.Mo O_xlayer was prepared by solution method,without vacuum treatment and high temperature annealing steps,and compatible with flexible substrate.Due to the high transparency and electrical transmission of Mo O_x,the prepared composite electrode exhibits excellent photoelectric performance with the figure of merit up to 256.Due to the protective effect of the very thin Mo O_xlayer,the composite electrode exhibits excellent mechanical stability and corrosion resistance in acidic environment.In addition,the flexible transparent heater based on Mo O_x/Ag NW/Mo O_xcomposite film exhibits a short response time（about 20 s）and good thermal aging resistance.（2）In order to optimize the thickness of metal oxide layer,a small amount of Sn²⁺was introduced into the solution of silver nanowires,and Sn²⁺was hydrolyzed to form-Sn-OH and Sn（OH）₂.When the Sn²⁺was adsorbed to the Ag surface,the Sn O₂layer was formed through redox reaction,and the Sn O₂layer was successfully coated on the surface of silver nanowires.According to the first-principles,the single-layer self-organization growth mechanism of Sn O₂was modeled at the density functional theory level.In addition,the flexible transparent electrode was fabricated by rotating coating Sn O₂@Ag NW on PET substrate,the figure of merit of the electrode was 268.In the UVO environment,the sheet resistance remains unchanged,showing excellent oxidation resistance,indicating that the introduced Sn O₂protective layer can effectively prevent the erosion of the air on the nanowires.（3）In order to further optimize the performance of flexible transparent electrode,a solvent-based inverted layer process was used to insert Sn O₂@Ag NW into the surface of CPI to prepare ultra-flexible film with a thickness of only 1.5μm.Under the synergistic effect of Sn O₂and CPI protective layers,the Sn O₂@Ag NW/CPI electrode shows high light transmittance,low resistivity,excellent thermal stability,environment stability and mechanical stability.The extremely low thickness allows the Sn O₂@Ag NW/CPI composite electrode to be tightly fitted to the palmprint.In addition,we prepared the pressure sensor based on this method,the pressure under the action of capacitance changed obviously.The prepared of ultra-flexible transparent heater shows short response time（about 15 s）and good thermal aging resistance.