Preparation method for transparent conductive metal network

Abstract

The invention discloses a preparation method for a transparent conductive metal network. The preparation method comprises the following steps: a) preparing a nanofiber network through electrospinning; b) evaporating a metal layer on the nanofiber network so as to obtain a metal-polymer network complex; and c) removing a metal in the metal-polymer network complex so as to obtain the transparent conductive metal network. The invention has the following beneficial effects: downstream tedious etching and patterning processes are avoided in preparation of a conductive film prepared from the flexible transparent metal network, demands of touch screens and display panels for patterning can be directly met, and online production can be realized.

Description

technical field [0001] The invention relates to a preparation method of a transparent conductive metal network. Background technique [0002] As a functional film with high light transmittance and low sheet resistance, transparent conductive film is widely used in touch screens, display panels, electromagnetic shielding, LED displays, electroluminescent devices, and thin-film solar cells. Especially in recent years, with the rapid development of touch products, there is a huge demand for transparent conductive films, and at the same time, many problems of traditional transparent conductive films based on indium tin oxide (ITO) have been exposed. Although the traditional ITO transparent conductive film can achieve a film resistance value of less than 10Ω / □ under the premise of 80% visible light transmittance, the resistivity is lower than 1.5×10-42·cm-1. The main problems of ITO transparent conductive films are as follows: (1) The key element indium in ITO faces a relatively...

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Problems solved by technology

[0004] At present, there have been many patent applications for transparent conductive films based on silver nanowires, but the usual processing technology is relatively complicated, and it takes several steps of transfer printing or repeated coating processes to finally achieve the required results.

Chinese patent applications 200910112924.X and 200910112925.4 disclose a method for preparing a transparent conductive film based on silver nanowires. The core idea is to increase the adhesion of silver nanowires on the substrate by adding an adhesion layer between the substrate and the nanowire conductive layer. Efforts have been made to basically solve the problem that the nanowires are easy to detach from the substrate, but the method used is relatively complicated, and the pre-prepared nanowire network needs to be transferred to the adhesion layer by transfer printing, which not only increases the difficulty of the process and Complexity, while the thickness of the silver nanowire network is difficult to control, which affects the light transmission of the final conductive film

The layering preparation process is complicated, and each layer needs to be dried after coating, which takes a long time and processing a new layer will inevitably cause damage to the existing layer, and the product yield will be greatly affected

Chinese patent application 201110444509.1 discloses another preparation method of transparent conductive film based on silver nanowires, which realizes a wide range of haze adjustment, but the polymer binders used in this patent are all insoluble resins, and the film formation is dry. Sometimes it will cause uneven crystallization and affect the light transmittance of the final film. At the same time, this method can only obtain an overall conductive initial film, which cannot meet the requirements of the touch terminal for electrode pattern design.

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