A kind of flexible, transparent conductive film and preparation method thereof

Abstract

The invention belongs to the field of materials and discloses a flexible and transparent conductive film. The conductive film includes a substrate, silver nanowires; the silver nanowires form a network structure, the conductive film also includes photonic crystals and / or conductive polymers, and the photonic crystals are in the meshes of the network structure formed by the silver nanowires. The preparation method of the conductive thin film comprises the following steps: (1) depositing photonic crystals on the substrate surface; (2) mixing soluble salts of silver, reducing agents, surfactants and solvents to obtain mixed solutions, and then Under ambient conditions, the mixed solution is coated on the surface of the photonic crystal prepared in step (1); then left to stand and washed to prepare the conductive film. The conductive thin film prepared by the invention has good flexibility, transmittance and conductivity, wherein the transmittance can exceed 97%, and the square resistance value can be lower than 20Ω / □.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a flexible and transparent conductive film and a preparation method thereof. Background technique [0002] Flexible and transparent conductive films are widely used in flexible displays, flexible touch screens, flexible OLEDs, and expandable solar cells due to their high light transmission, high conductivity, and flexibility. [0003] At present, the commercial transparent conductive film is mainly ITO (indium tin oxide) conductive film, but its disadvantages such as poor flexibility, lack of indium resources, easy diffusion of metal ions, and inability to acid and alkali greatly limit the use of ITO. Application of conductive films in flexible electronics. Common flexible electrode materials mainly include: carbon nanotubes, conductive polymers, graphene, and silver nanowires. Among them, carbon nanotubes have high flexibility, but large sheet resistance; conductive polymers have high...

AI Technical Summary

Problems solved by technology

Among them, carbon nanotubes have high flexibility, but large sheet resistance; conductive polymers have high flexibility and low cost, but their chemical stability is poor, and they have strong absorption in the blue light band; graphene has excellent conductivity and flexibility, but The process is difficult and the sheet resistance is large, which cannot meet the actual needs of electronic products; silver nanowires have attracted the attention of the market due to their super flexibility, thermal conductivity and electrical conductivity, but currently the silver used in the preparation of transparent conductive films Nanowires are easy to agglomerate, affecting electrical conductivity and light transmission

[0004] In the prior art, most of the silver nanowires are dispersed into organic solvents or inorganic solvents to form "self-sedimentation" films. Therefore, to ensure the conductivity of silver nanowire films, more silver nanowires must be clustered and aggregated. Arrangement, but this is not conducive to the light transmittance of the film. To ensure the light transmittance of the film, the distribution of silver nanowires must be "sparse", but this just greatly reduces the conductivity of the film.

In addition, there are a large number of pores in this kind of film, and the surface roughness of local areas is too large, which may easily cause large leakage current of the device, or even short circuit.

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