Copper nanowire preparation method and copper nanowire composite transparent conductive thin film

Abstract

The invention discloses a copper nanowire preparation method and a copper nanowire composite transparent conductive thin film. According to the copper nanowire preparation method, initial raw materials including water, octadecylamine, metal copper salt and vitamin C are adopted to prepare a copper nanowire of which the diameter ranges from 40 to 100 nm, of which the length ranges from 40 to 150 microns and of which the surface is smooth. The copper nanowire composite transparent conductive thin film comprises an upper polymethyl methacrylate layer, a copper nanowire layer, a lower polymethyl methacrylate layer and a transparent substrate which are distributed from top to bottom sequentially; the light transmittance of the copper nanowire composite transparent conductive thin film ranges from 40% to 90%; the square resistance of the copper nanowire composite transparent conductive thin film ranges from 5 to 200 ohm / cm<2>; and the surface roughness of the copper nanowire composite transparent conductive thin film ranges from 15 to 100 nm. The copper nanowire preparation method of the invention is low in cost and simple in process, and can produce super long copper nanowires in a batched manner. According to the copper nanowire composite transparent conductive thin film of the invention, a double-layer polymethyl methacrylate structure is adopted, and therefore, adhesion between acopper nanowire grid and a substrate can be improved, the surface roughness of the copper nanowire grid can be decreased, contact area between the copper nanowires is increased, and the copper nanowires can be insulated from the air, so that the copper nanowires can be prevented from being oxidized, and the conductivity and stability of the thin film can be improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of one-dimensional nano-materials and two-dimensional nano-film materials, and in particular relates to a method for preparing copper nanowires and a composite transparent conductive film of copper nanowires. Background technique [0002] At present, copper nanowires are widely used in transparent conductive films such as high conductivity and low square resistance due to their good conductivity and low cost. Nowadays, copper nanowires are mainly prepared by physical or chemical methods, such as liquid phase reduction method, template synthesis method and wet chemical method. Among them, the template synthesis method and the wet chemical method have high cost, complicated process, and are easy to cause damage to the grown copper nanowires, so they are not suitable for large-scale production; the liquid phase reduction method is currently a relatively flexible and low-cost method that can grow ...

AI Technical Summary

Problems solved by technology

The most mature technology of graphene is to grow and prepare by chemical vapor deposition, but its cost is very high; because of the poor bonding between tubes and tubes, the square resistance of carbon nanotubes is high; the photoelectric performance of conductive polymers has not been able to reach ITO level; compared with silver, the conductivity of copper is only 6% worse than silver, but its reserves are 1000 times that of silver, and the unit price is only 1% of silver

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