Composite transparent conductive film and preparation method thereof

Abstract

The invention relates to a composite transparent conductive film and a preparation method thereof. The preparation method comprises the following steps of S1, performing catalytic growth of a single-crystal-layer graphene film on the surface of a metal substrate, and obtaining a structure I; S2, plating a silver nanometer wire on the surface of the graphene film of the structure I, thereby obtaining a composite structure II; S3, uniformly plating a liquid photo-curable material on a flexible transparent substrate, thereby obtaining a composite structure III; S4, performing aligned pressing on the liquid photo-curable coating in the composite structure III and the silver nano-wire coating in the composite structure II, thereby obtaining a composite structure IV; S5, performing irradiation on the composite structure IV so that the liquid photo-curable coating is converted to solid, thereby obtaining a composite structure V; and S6, through an electrochemical stripping method, separating a metal substrate in the composite structure V, thereby obtaining a composite conductive flexible film. The preparation method has advantages of simple operation, high reliability and high suitability for large-scale production. The prepared composite transparent conductive film has advantages of excellent conductivity, high transmittance and reliable performance.

Description

technical field [0001] The invention relates to the field of preparation of transparent conductive films, in particular, to a composite conductive film and a preparation method thereof. Background technique [0002] Transparent conductive materials are important components of many electronic devices, such as touch screens, displays, electronic paper, solar cells, etc. With the advancement of science and technology, the use of flexible transparent conductive materials to manufacture rollable and foldable electronic products has become a new development trend. [0003] In the field of transparent conductive materials, the traditional indium tin oxide (ITO) is facing the problem of depletion of the corresponding raw ore; at the same time, the conductive film made of indium tin oxide will be brittle and broken when it is bent, and the surface resistance will increase. . It is difficult to adapt to the development needs of flexible electronic devices. [0004] In recent years,...

AI Technical Summary

Problems solved by technology

However, there are problems with silver nanowires: 1. The silver wires exposed on the surface are easily oxidized, and the surface resistance increases; 2. Conductive network, fine pattern, open circuit; 3. Continuous current, melting at the overlapping point

The problem with graphene is that the large-area graphene transparent conductive film prepared by chemical vapor deposition (CVD) technology has a polycrystalline structure, and the high-impedance grain boundaries between crystal domains lead to high square resistance of graphene film products.

GO is prepared from natural graphite by chemical oxidation and stripping, leaving a small amount of strong oxidizing substances, which will slowly etch silver nanowires; in addition, GO has poor conductivity, and the composite of the two is dominated by silver nanowires. , too much GO will reduce the composite conductivity and reduce the light transmittance; while the method of reducing graphene oxide is either less efficient or more toxic

The composite of silver nanowires and CVD graphene films has also been reported, but there are many problems to be solved, for example, it cannot be prepared in large batches, there are many transfer defects in CVD graphene, and the contact resistance between silver nanowires and CVD graphene is high.

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