Study On Weak Electric Field Dispersion Mechanism Of Copper Nanowires And High Performance Copper Nanowire Transparent Electrode

As one of the key components of electronic devices,copper nanowire transparent conductive film has broad application in the fields of aerospace,military,manufacturing and consumer electronics.However,at present,copper nanowire has low dispersibility in ink,resulting in poor uniformity of transparent conducting film prepared by it,which hinders the practical application of copper nanowire.Aiming at this bottleneck problem,this work proposes a copper nanowire dispersion mechanism to achieve high dispersion of copper nanowire in water.The effect of copper nanowire surface charge and charge in water on copper nanowire dispersion is studied,and a breakthrough in the preparation of copper nanowire transparent conducting film is made.We realize the application of an organic solar cell（OSC）and an organic light-emitting diode（OLED）on the film.The research work is divided into the following three aspects:1.The preparation process of copper nanowire was studied,and the batch preparation of copper nanowire with diameter of 60 nm and length of 50μm was realized.Based on that,the effects of the bond strength between the charge modifier and copper nanowire,number of unit charge modifier,and the total number of charge modifiers on the charge distribution and charge number in the ink were investigated.And we studied the influence of that on the dispersion of copper nanowire.The weak electric field equilibrium dispersion mechanism of copper nanowire is proposed.The results show that the dispersion of copper nanowire is determined by the surface charge（driving force）and the charge in water（resistance force）.A proper amount of surface charge can provide enough copper nanowire dispersing force to improve the dispersion of copper nanowire in the ink.2.The use of 2-mercaptoethanol as a copper nanowire charge modifier achieves high dispersion of copper nanowire.The test results show that the surface potential of copper nanowire is as high as-45.66 mV.After 30 hours of standing,the Turbiscan Stability Index is as low as 0.69,and the oxidation resistance is significantly improved.The problem that hindered the preparation and application of copper nanowire transparent conducting film is solved,and a breakthrough was made in the preparation of copper nanowire film.3.Using the highly dispersed copper nanowire ink,low square resistance(65.7?2.5Ωsq^-1),high transmittance（92%）,low surface roughness（1.81 nm）,large area（23?23cm²）copper nanowire transparent conducting film was prepared.Using it as the positive electrode,we successfully developed two organic optoelectronic devices:OSC and OLED.Test results show that the performance of the two devices is comparable to that of device using ITO as positive electrode.These show that the copper nanowire ink and transparent conducting film prepared in this work meet the requirements of practical applications.In this work,we propose a copper nanowire dispersion mechanism,and prepare highly dispersible copper nanowire inks and transparent conducting films,which are applied to organic optoelectronic devices.This work lays a foundation for the mass production of copper nanowire inks.