A kind of surfactant-free graphene composite conductive ink

A graphene composite, surfactant technology, applied in inks, household appliances, applications, etc., can solve the problems of expensive metal consumables, brittleness of rGO film, poor windability, etc., to achieve high conductivity, excellent flexible conductive film, The effect of excellent printing adaptability

Active Publication Date: 2021-10-01
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional electronic devices and energy storage devices prepared by photolithography, chemical etching, chemical plating, vacuum deposition, etc. have many defects: expensive metal consumables, complicated processes, environmental pollution, etc.
This method is relatively simple and avoids toxic and harmful solvents. However, the dispersion of graphene or the addition of too much insulating surfactant will hinder the application of liquid phase exfoliation in the field of conductive inks.
The preparation of graphene conductive ink by oxidation exfoliation solves the dispersion of graphene conductive ink. GO is directly dispersed in conductive ink as a conductive precursor, and a green conductive ink with high water stability and dispersion can be obtained. However, the GO conductive ink printed Conductive films need further post-processing to obtain materials with certain conductive properties. Post-processing includes thermal reduction treatment or chemical reduction treatment and rolling treatment, and various post-processing methods will damage the reduced graphene oxide film to a certain extent.
Moreover, the rGO film prepared by GO conductive ink has high brittleness and poor windability.
At present, there are still obvious defects in the preparation methods of the two types of graphene conductive inks that are currently being studied. Therefore, if the use of high-boiling point toxic solvents and insulating surfactants can be avoided, a class of solvent-safe and environmentally friendly, surfactant-free, Graphene conductive inks with highly stable dispersion, high conductivity, and printable flexible films will promote the development of next-generation flexible electronics

Method used

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  • A kind of surfactant-free graphene composite conductive ink
  • A kind of surfactant-free graphene composite conductive ink
  • A kind of surfactant-free graphene composite conductive ink

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036](1) Accurately weigh the following raw materials by mass: 1 part of graphene oxide, 1 part of acetylene carbon black, disperse and exfoliate graphene oxide (GO) nanosheets and intercalate carbon black particles (CB) through high-frequency ultrasonic treatment Graphene oxide nanosheets to obtain a stable graphene oxide / carbon black (GO / CB) dispersion;

[0037] (2) Freeze-drying the resulting GO / CB dispersion to obtain a CB interlayer GO conductive precursor;

[0038] (3) Accurately weigh the following raw materials by mass: p-phenylenediamine (PPD) 0.5 / 5 parts, precursor material 1 part, ethylene glycol 100 parts, mix with high-frequency ultrasound for 1 min, and then keep the temperature of the obtained dispersion The CB@rGO coated structural material was obtained by water bath treatment at 80°C. The excess p-phenylenediamine and free carbon black particles are removed by filtration, water washing, and centrifugation to obtain conductive fillers with low degree of reduc...

Embodiment 2

[0043] (1) Accurately weigh the following raw materials by mass: 1 part of graphene oxide, 4 parts / 2 parts / 1 part / 0.5 part / 0.25 part of acetylene carbon black (M GO / M CB =4 / 1, 2 / 1, 1 / 1, 1 / 2, 1 / 4), through high-frequency ultrasonic treatment, disperse and exfoliate graphene oxide (GO) nanosheets and intercalate carbon black particles (CB) into graphite oxide ene nanosheets to obtain a stable graphene oxide / carbon black (GO / CB) dispersion;

[0044] (2) Freeze-drying the resulting GO / CB dispersion to obtain a CB interlayer GO conductive precursor;

[0045] (3) Accurately weigh the following raw materials by mass: 5 parts of p-phenylenediamine (PPD), precursor material (M GO / M CB =4 / 1, 2 / 1, 1 / 1, 1 / 2, 1 / 4) 1 part each, 100 parts of ethylene glycol, after mixing, high-frequency ultrasonication for 1 min, and then treat the obtained dispersion in a water bath at a constant temperature of 80°C to obtain CB @rGO wraps structural materials. Remove excess p-phenylenediamine and fr...

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Abstract

The invention discloses a surfactant-free graphene composite conductive ink, which is prepared by fully mixing and dispersing the following raw material components in parts by weight: 1-50 parts by weight of CB@rGO conductive filler, 1-15 parts by weight of binder and 200-1000 parts by weight of alcohol solvent with 1-4 carbon atoms. The present invention effectively solves the problem of the dispersion stability of the two conductive phases of graphene in the ink dispersion process and the agglomeration of graphene nanosheets by constructing a "graphene-conductive carbon black-graphene" conductive path, and reduces the cost of graphene nanomaterials. Contact resistance problems in forming conductive paths. The invention can stably disperse the composite graphene conductive ink for a long time without the addition of additional surfactants. Because there is no insulating surfactant, the annealing temperature of the film can be reduced and the printing adaptability of the ink on various substrates can be improved.

Description

technical field [0001] The invention belongs to the technical field of graphene application, in particular to a surfactant-free graphene composite conductive ink. Background technique [0002] Conductive ink is a composite material composed of conductive fillers, binders, solvents and various additives, among which the conductive filler is the key phase of the performance of conductive ink. There are countless conductive fillers evenly dispersed in the binder and ink solvent in the conductive ink. The liquid conductive ink is in an insulating state. The conductive pattern or printed film obtained after the conductive ink is printed, and the printed product obtained after annealing has a certain degree of conductivity. . Traditional electronic devices and energy storage devices prepared by photolithography, chemical etching, chemical plating, vacuum deposition, etc. have many defects: expensive metal consumables, complicated processes, environmental pollution, etc. In the 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/52
CPCC09D11/52
Inventor 陈国华邱欣斌刘飞翔赵小敏陈丹青
Owner HUAQIAO UNIVERSITY
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