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High-quality graphene dispersion method and film preparation method

A film preparation and graphene technology, applied in the field of graphene, can solve problems such as difficult to remove, impact, dispersant residue, etc., and achieve excellent electrical and thermal properties

Active Publication Date: 2015-03-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using this dispersion to prepare graphene, such as graphene film, etc., it will usually cause the residue of the dispersant after the liquid phase is formed and it is difficult to remove, which will adversely affect the final performance, especially the electrical and thermal properties.

Method used

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  • High-quality graphene dispersion method and film preparation method
  • High-quality graphene dispersion method and film preparation method

Examples

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Effect test

Embodiment 1

[0044] Add 2g of graphene powder prepared by intercalation exfoliation method into 100g of 0.2wt% allylamine aqueous solution (pH=3), and ultrasonically disperse for 30 minutes to obtain a uniform graphene dispersion. In the present embodiment, the concentration of graphene dispersion liquid is 2wt%, as attached figure 1 As shown, the stable dispersion time of the dispersion is greater than 180 days. Use the above dispersion to prepare a graphene film on the surface of aluminum foil by scraping method. After the film is formed, it is dried at 120°C for 10 hours to remove allylamine and obtain a graphene film attached to the surface of aluminum foil. figure 2 shown. The typical surface micromorphology of graphene film is shown in the attached image 3 As shown, it is shown as a dense film formed by overlapping graphene sheets, and the thickness of the graphene film in this embodiment is 1 μm.

Embodiment 2

[0046] Add 1g of graphene powder prepared by intercalation exfoliation method into 100g of 0.5wt% diallylamine ethanol solution (pH=3), and ultrasonically disperse for 30 minutes to obtain a uniform graphene dispersion. In this embodiment, the concentration of the graphene dispersion is 1 wt%, and the stable dispersion time of the dispersion is greater than 180 days. Use the above dispersion to prepare a graphene film on the surface of the polypropylene film by roll coating. After the film is formed, it is dried at 100°C for 5 hours to completely remove diallylamine and obtain graphene attached to the surface of the polypropylene film. film, if attached Figure 4 shown. Surface morphology and attachment of graphene films image 3 Similarly, the thickness of the graphene film in this embodiment is 3 μm.

Embodiment 3

[0048] Add 2g of graphene powder prepared by the intercalation exfoliation method to 100g of diethylenetriamine aqueous solution (pH=3) with a concentration of 1wt%, and disperse at a speed of 20,000 rpm for 30 minutes under high-speed shear to obtain a uniform Graphene slurry. In this embodiment, the concentration of the graphene slurry is 2wt%, and the stable dispersion time of the slurry is greater than 180 days. Using the above dispersion, a graphene film was prepared on the surface of a polyvinylidene fluoride (PVDF) filter membrane by continuous suction filtration to form a film. After film formation, it was dried at 120°C for 10 hours to completely remove diethylenetriamine. And after drying, the graphene film can be separated from the PVDF filter membrane to obtain an independent graphene film, as attached Figure 5 As shown, the thickness of the graphene film in this embodiment is 25 μm.

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Abstract

The invention relates to the field of graphene, particularly a high-quality graphene dispersion method and a method for preparing a film from a corresponding graphene dispersion solution or slurry. Graphene powder or aggregation-state slurry is added into a micromolecule amine compound solution to carry out dispersion treatment, so that the three amine micromolecule compounds are utilized to implement dispersion of the graphene; and in the dispersion solution, the molecules of the compounds are combined with the graphene under the pai-pai interaction, the amino group protonation is utilized to electrically charge the graphene, and the electrostatic repulsion action is utilized to prevent aggregation, thereby implementing the stable dispersion of the graphene. The dispersion solution or slurry can be subjected to spray coating, roller coating, scratch coating or any other conventional coating preparation method to obtain a graphene film on the substrate surface. The method can implement high-concentration efficient dispersion on high-quality graphene with the carbon / oxygen atom ratio of greater than 20 in multiple solvents; and after the film is formed and dried, no solvent or dispersant residue exists.

Description

technical field [0001] The invention relates to the field of graphene, in particular to a method for dispersing high-quality graphene, and a method for preparing a film by using the corresponding graphene dispersion or slurry. Background technique [0002] Graphene (Graphene) has attracted much attention as a new type of carbon material. It is a sp 2 Composed of hybrid carbon atoms, a two-dimensional crystal material with a thickness of only a single atomic layer has excellent properties such as high light transmission and electrical conductivity, high specific surface area, high strength and flexibility, and is expected to be used in high-performance nanoelectronic devices. , photoelectric devices, gas sensors, composite materials, field emission materials and energy storage and other fields have been widely used. High-quality graphene refers to a large sheet area (lateral dimension > 1 micron), complete crystal structure, less defects (Raman spectrum shows that the D p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184
Inventor 裴嵩峰黄坤李峰周光敏闻雷宋仁升任文才成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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