The Development of Nano Silver Wire

With the advent of folding mobile phones from brands such as Samsung and Huawei, the topic of flexible transparent conductive films and flexible transparent conductive materials has risen to an unprecedented level. On the road to commercialization of folding mobile phones, there is an important material that has to be mentioned, that is, "nano silver wires" with a one-dimensional structure with good bending resistance, high light transmittance, high electronic conductivity and thermal conductivity.

Why is it important?

Silver Nanowires are a one-dimensional structure with a maximum width of 100nm in the horizontal direction, no limitation in the vertical direction, and an aspect ratio of >100, which can be dispersed in different solvents such as water and ethanol. Generally speaking, the longer the length and the smaller the diameter of the silver nanowire, the higher the light transmittance and the lower the resistance.

The reason why it is considered as one of the most promising flexible transparent conductive film materials is that the traditional transparent conductive material-indium oxide has high cost and poor flexibility in application, so people began to study carbon nanotubes, Graphene, metal grids, metal nanowires and conductive polymers are used as alternative materials.

Metal silver wire itself has the characteristics of low resistivity, so it has been widely used in LED and IC packaging as an excellent conductor. When it is transformed into Nanosilver size, it not only retains the original advantages, but also has unique surface and interface effects. Its wire diameter is much smaller than the incident wavelength of visible light, and it can be densely arranged into ultra-small circuits to increase the set size. Flow area is favored by the mobile phone screen market. At the same time, the nano-size effect of nano-silver wires also endows them with excellent bending resistance, not easy to break under strain, and fully meets the design requirements of flexible devices, making them the most ideal material to replace traditional ITO.

How are nano silver wires prepared?

At present, there are many methods for preparing silver nanowires, such as stencil method, photoreduction method, seed method, hydrothermal method, microwave method, and polyol method. Among them, the template method requires a prefabricated template, and the quality and quantity of the pores determine the quality and quantity of the nanomaterials obtained; the electrochemical method pollutes the environment and has low efficiency; and the polyol method is greatly affected due to its simple operation, good reaction environment, and easy availability of raw materials. Favored by most people, it has received a lot of research.

Nano silver wire is the most potential ITO alternative. If it can solve its early constraints and give full play to its advantages to achieve full mass production, then flexible screens based on nano silver wires will also usher in unprecedented development opportunities. According to public information, the proportion of bendable and foldable soft screens is expected to reach more than 60% in 2020, so the development of nano silver wires is of great significance.

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