Controllable Preparation And Application Of Transparent Flexible Conductive Film Of Silver Nanowires

Transparent flexible conductive film is one of the core components of flexible optoelectronic devices,which plays a very important role.Its photoelectric properties also directly affect the performance of flexible electronic devices.Silver nanowires（Ag NWs）transparent flexible conductive film has good mechanical flexibility,low resistance and high light transmittance,so it is the most potential conductive material in the field of flexible electronics in the future.However,Ag NWs is still faced with problems such as poor adhesion,uneven film formation and lack of good photoelectric performance.Therefore,this paper optimized the polyol synthesis method to prepare Ag NWs,and use the thickener to adjust Ag NWs ink,adapt to different coating methods,and improve its adhesion with the substrate,and use eccentric spin coating method to conduct ordered film formation of Ag NWs,so that the photoelectric performance of Ag NWs conductive film can be fully played.A large area flexible transparent electrode was prepared by screen printing and roll-to-roll slot coating.Finally,Ag NWs flexible transparent electrodes was used to prepare flexible light-emitting display devices,and the performance of the device was analyzed.The main research contents are as follows:（1）Synthesis of Ag NWs by polyol method.By optimizing the reaction conditions and parameters in the synthesis experiment,Ag NWs with a length of 130μm,a diameter of 90nm and a slenderness ratio of 1500 were synthesized.The yield of Ag NWs was up to 83.4%,and the thickness of PVP coating was only 2.709nm.（2）Fabrication of embedded Ag NWs flexible transparent electrodes.A novel eccentric spin coating method was proposed for Ag NWs film formation.Finally,a mesh Ag NWs conductive film with surface resistance and transmittance of 16.4Ω/sq and 93.7%was obtained.Ag NWs was embedded with polyvinyl alcohol（PVA）to prepare embedded PVA@Ag NWs flexible transparent electrode.Its surface resistance and transmittance are18.6Ω/sq and 85.5%,respectively,with good adhesion and small surface roughness.（3）Preparation of large area Ag NWs flexible transparent electrode.Ag NWs ink viscosity was adjusted by thickening of hydroxypropyl methyl cellulose（HPMC）.Ag NWs flexible transparent electrodes was prepared by screen printing and roll-to-roll slot coating printing.Ag NWs ink was prepared under 0.4wt%HPMC content.A large area flexible transparent electrode with a surface resistance of 36.4Ω/sq and light transmittance of 93.6%was prepared,and HPMC mucosa could enhance the adhesion of Ag NWs.（4）Fabrication of flexible light-emitting display devices.The flexible electrochromic device was prepared by using the embedded PVA@Ag NWs flexible transparent electrode,and the structure of the electrochromic device was simplified by replacing the top electrode with PAAM-Li BF₄gel electrolyte,which improved the overall light transmittance of 7.7%.When the concentration of Li BF₄is 1.0mol/L and the thickness of PEDOT:PSS electrochromic layer is 1.49μm,the electrochromic device has the highest optical contrast of43.9%.In addition,flexible thermochromic devices and flexible electroluminescent devices were prepared by large area Ag NWs flexible transparent electrodes.The three display devices have different display effects.