Preparation Of Silver Nanowires And Their Application In Flexible Conductive Film

Silver nanowires(Ag NWs) not only have good electrical conductivity, but also have unique optical, electrical, and biological characteristics, because of their small size effect, quantum effects, and high specific surface effect. In recent years, research on silver nanowires has attracted wide attention. With the electronic product miniaturization, lightweight, thin development, as well as the advent of more flexible electronic devices, the conventional transparent conductive film using rigid substrate material has been greatly restricted. This work is a combination of silver nanowires and traditional polymers for the preparation of the flexible conductive film. The prepared film not only has the conductivity and light transmittance of the conventional transparent conductive film, but also has the unique flexibility of the polymer, which is the most promising alternative to conventional rigid conductive film.This article explored the polyol reduction method to prepare the silver nanowires with high aspect ratio, and studied the growth process and the grow th mechanism of it. In addition, it investigated the effect of different process parameters of the silver nanowires’ preparation, mainly focusing on the reaction atmosphere, the type of the reducing agent, the concentration of Ag NO3, the molecular weight of PVP, the concentration ratio of PVP and Ag NO3, the nucleation control agent, temperature, time and other process parameters, which affect the morphology and structure of the silver nanowires. After a series of experiments, the article developed the optimal experimental program for the preparation of the silver nanowires under the ethylene glycol system. In this thesis, the morphology and structure of the silver nanowires were systematically characterized. Research showed that the products have face-centered cubic structure of pure metallic silver, with good crystallinity and uniform size. The average length of silver nanowires was 15-20 μm, and the average diameter was 60-80 nm. The result of amplifying experiment of this program showed that the morphology and size of the obtained silver nanowires were good, and the program was stable and repeatable, which had the possibility of mass production.This article selected three different substrate materials for the preparation of silver nanowires flexible conductive film. The Ag NWs-PVA film was prepared by transfer method; the Ag NWs-PET film was prepared by spraying coating; and the Ag NWs-MCE film was prepared by vacuum filtration. The effect of different processes was studied in detail, and this article compared the performance of photoelectric, flexibility and surface adhesion of the three flexible conductive films. These conductive films all showed good flexibility performance. The Ag NWs-PVA film and the Ag NWs-MCE film both had excellent photoelectric performance, good surface adhesion, but these two conductive films were susceptible to environmental impact. The Ag NWs-PET film owned stable performance and good photoelectric performance, but had poor surface adhesion. However, since the preparation of the flexible cond uctive film by spray coating could be achieved at low cost, large area, and high production efficiency, it needs further improvement for the surface adhesion of the Ag NWs-PET film to achieve a broader application.