A kind of graphene organic silver conductive ink and preparation method thereof

Abstract

The invention discloses a graphene organic silver conductive printing ink and a preparation method thereof. The conductive printing ink comprises a conductive function unit precursor, an organic silver complexing agent, an adhesive, a solvent and auxiliaries. The preparation method comprises the following steps: (A) stirring and ultrasonically dispersing the organic silver, the solvent and the organic silver complexing agent under a lucifugal condition to obtain an organic silver complexing solution; and (B) putting the graphene, the resin adhesive, the auxiliaries and the organic silver complexing solution in the lucifugal condition and stirring and ultrasonically dispersing in an environment lower than 10 DEG C, wherein the obtained uniform mixture is the graphene organic silver conductive printing ink. The graphene organic silver conductive printing ink prepared by the method disclosed by the invention is low in solid content, good in stability, good in printing performance and wide in application.

Description

technical field [0001] The invention relates to the field of conductive ink, in particular to a graphene organic silver conductive ink and a preparation method thereof. Background technique [0002] With the rapid development of science and technology and the large-scale use of integrated circuits, microelectronic devices are becoming more and more miniaturized, and electronic circuits such as printed circuits, smart labels, flexible display devices, and sensors are also developing towards miniaturization, refinement, and diversity. There are more and more types of corresponding printing methods and substrates. Printing methods include screen printing methods, gravure printing methods, etching methods, spin coating methods, electroplating methods, chemical vapor deposition methods, inkjet printing methods, direct pen writing methods, etc.; as printed substrates, they can be divided into rigid substrates Materials, such as glass, metal, semiconductor, silicon wafer, ceramics...

AI Technical Summary

Problems solved by technology

[0005] However, when graphene is used to prepare conductive materials, there is a sheet interface resistance, and the prepared conductive ink is easy to agglomerate and has poor dispersion. The actual conductivity is far from the theoretical conductivity of graphene.

At present, the method of adding nano-silver to graphene is used to ensure its conductivity. The amount of nano-silver added in this method is generally greater than 50 wt%. The preparation of nano-silver is also cumbersome and complicated, which undoubtedly increases the production cost; Both graphene and metallic silver in conductive ink are solid, which brings difficulties to the dispersion of particles in the ink configuration and the application of certain printing methods (such as inkjet, direct writing). Therefore, a silver precursor that can be adjusted into a liquid state is provided The method to prepare graphene and silver composite type conductive ink has great practical significance

[0006] Organic silver is an organic compound of silver, which can be prepared into a liquid state through complexation, but organic silver is unstable, and the added components can easily cause its rapid decomposition and reduction. There are reports