Preparation method of nano-copper printing ink and copper conductive film

Abstract

The invention relates to technical field of printed electronics, and discloses a preparation method of nano-copper printing ink and a copper conductive film. The preparation method comprises the following steps of: dispersing nano-copper into ethanol containing short-chain hydroxyl carboxylic acid, ethylene glycol or a mixed solution of ethanol and ethylene glycol, coating onto the surface of a substrate; and baking at a low temperature to form a copper conductive film. In the dispersing process of nano-copper, the short-chain hydroxyl carboxylic acid can react with oxidized nano-copper to generate an organic copper salt, and the organic copper salt and residual hydroxyl carboxylic acid are coated on the surface of nano-copper for preventing the nano-copper from being further oxidized; and in a baking process, the generated organic copper salt can be reduced into copper, the hydroxyl carboxylic acid is used for preventing nano-copper from being oxidized, and residual short-chain hydroxyl carboxylic acid has relatively-low boiling point and low decomposing temperature and is very easy to remove in the baking process, so that the problem of easiness in oxidizing of nano-copper in treatment processes such as dispersing, printing, baking and the like is solved effectively.

Description

technical field [0001] The invention relates to the technical field of printed electronics, in particular to a preparation method of using short-chain hydroxycarboxylic acid as a reducing agent and a dispersant to stably print nano-copper ink for electronics and a method for making a copper conductive film with the nano-copper ink. Background technique [0002] In recent years, printed electronics technology has attracted great attention in the application of radio frequency identification tags, wearable electronics, organic light-emitting diodes and organic solar materials. The traditional printed circuit industry uses photolithography. However, this method involves many steps, such as etching, metal deposition and electroplating. These processes are accompanied by the generation of large amounts of toxic chemical waste. Therefore, many researchers have begun to pay attention to the direct inkjet printing technology, because this method does not require additional etching a...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of nano-copper ink and copper conductive film, so that the preparation process of nano-copper ink and the problem that nano-copper ink is easily oxidized in the process of making copper conductive film through post-processing steps such as printing and roasting be resolved

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