Preparation method of graphene conductive ink

Abstract

The invention discloses a preparation method of graphene conductive ink. The preparation method comprises the following steps: expandable graphite pretreatment, graphene preparation and graphene conductive ink preparation. The graphene conductive ink has the advantages of excellent conductivity, mild curing conditions, good printing adaptability, light printed pattern mass, good stability, good oxidation resistance and the like, and the used solvent is harmless to human bodies.

Description

technical field [0001] The invention relates to the technical field of electronic material conduction, in particular to a preparation method of graphene conductive ink. Background technique [0002] Due to the wide application of conductive inks in transistors, sensors, antennas, RFID tags, wearable electronic products, etc., the development of printed conductive inks for electronic products has grown rapidly, because conductors are the core part of printed electronic products, so in the past few In recent years, the main focus is to provide highly conductive metal sodium nanoparticle inks, especially the use of silver nanoparticles. However, the high price of silver cannot be applied to low-cost products, and other metal nanoparticles such as copper and aluminum are much cheaper but easier. It is oxidized. In order to avoid oxidation, a sintering process must be carried out after printing. However, for heat-sensitive substrates (paper, plastic, etc.), the sintering process ...

AI Technical Summary

Problems solved by technology

[0002] Due to the wide application of conductive inks in transistors, sensors, antennas, RFID tags, wearable electronics, etc., the development of printed conductive inks for electronic products has grown rapidly, because conductors are the core part of printed electronics, so in the past few years In 2009, the main efforts were to provide highly conductive metal sodium nanoparticle inks, especially the use of silver nanoparticles. However, the high price of silver could not be applied to low-cost products. Other metal nanoparticles such as copper and aluminum are much cheaper but easy to use. It is oxidized. In order to avoid oxidation, sintering treatment must be carried out after printing. However, for heat-sensitive substrates (paper, plastic, etc.), sintering treatment cannot be applied. Conductive polymers can also be made into conductive films, but currently This technology is not stable enough both chemically and thermally. Carbon nanotubes (CNTs) have been considered as a substitute for metal nanoparticles, but the low surface conductivity caused by the extremely high junction resistance between CTNs limits its application. The printed electronics industry has long longed for low-cost, high-conductivity inks

[0003] Graphene ink, a dispersion of graphene flakes in a solvent, can be easily patterned by techniques such as spraying, screen printing, inkjet printing and doctor blade coating, and is used in antenna printing. Insufficient in accuracy is less used, inkjet printing and doctor blade coating methods are complementary, the former has high precision and cost compared to the latter, in addition, inkjet printing must be printed many times to obtain a lower surface Resistors, which are time-consuming and not economically viable for mass production, considering cost, printing accuracy and surface conductivity, screen printing is the best choice for industrial-scale production, and most graphene ink processes use Organic solvents such as NMP and DMF, but these solvents have toxicity, low concentration, and non-renewability, which prevent their large-scale application in industry. Therefore, we propose a preparation method of graphene conductive ink