Study On Fabrication And Properties Of Mesh-structured Silver Nanowire Networks

With the development of electronics,the flexibility of electronics become a focused researching point.Flexible transparent conductive film(TCF)is base of various flexible electronic devices.As the most used material in TCF,ITO is too crisp to achieve flexibility.Silver has great properties in conductivity and flexibility,and Ag nanowire(Ag NW)is regarded as the ideal material to fabricate flexible TCF.In this thesis,Ag NW is prepared by polyol method and made to fabricate mesh-structured networks.The mesh-structured Ag NW networks is transferred to PET substrate to form flexible TCF.By studying the property of the TCF theoretically and experimentally,the mesh-structure is proved useful to improve the photoelectric property and flexibility of the Ag NW TCF.Ag NW is synthesized by a rapid polyol process.Several parameters,such as agent injection speed,stirring velocity,reaction time and molecular weight of PVP are studied.Ag NW synthesized with modified parameters is 50 ?m in length and80 nm in diameter.The relationship between the properties of mesh-structured film and random film is calculated by FEM simulation.The influences of some factors,such as shape and size of mesh,area proportion of holes region and direction of electric current are studied.Results show that the mesh-structured Ag NW TCF is better than random Ag NW TCF,when the mesh is thin and has high concentration of Ag NW.The pattern template is formed by solidification of silica gel.Mesh-structure with 0.5 mm in single mesh size and 50 ?m in width of mesh line is fabricated.The mesh-structured Ag NW film is transferred to PET by a mechanical lamination technique and a flexible TCF is completed.The measured photoelectric property and flexibility of TCF made by mesh-structured Ag NW networks is superior to the random Ag NW networks.The good flexibility is proved come from the high concentration of Ag NW in mesh region.The transmittance of film is 95.4 % when sheet resist is 51.7 ?/sq,and the properties of the film maintain well after 5000 bending cycles.