A kind of preparation method and application of few-layer graphene powder

Abstract

The invention discloses a preparation method of a few-layer graphene powder: stirring and pre-dispersing deionized water and an inorganic intercalation agent, and high-speed shearing to obtain an inorganic intercalation liquid; wherein, the inorganic intercalation agent is nano gas phase dioxide Silicon, ultrafine barium sulfate, nano-calcium carbonate, nano-titanium dioxide, nano-iron oxide, nano-zirconia, nano-zinc oxide, spherical alumina, carbon black, carbon nanotubes; Alcohol is added to the inorganic intercalation solution for stirring pre-dispersion, high-speed shearing, and high-pressure peeling to obtain a nano-dispersion of few-layer graphene; then concentrated by centrifugation or press filtration, dried, and pulverized to obtain a few-layer graphene powder. In the present invention, the water-insoluble inorganic intercalation agent is selected as the intercalation agent for preparing graphene, which will not cause residue in graphene, thereby ensuring the quality of graphene. At the same time, the intercalation agent completes the intercalation and wedges between the graphene sheets It can also suppress the agglomeration of graphene.

Description

technical field [0001] The invention belongs to the field of graphene, in particular to a preparation method and application of a few-layer graphene powder. Background technique [0002] Graphene is the thinnest and hardest nanomaterial, it is almost completely transparent, absorbing only 2.3% of light. Due to the strong interatomic force, at room temperature, even if the surrounding carbon atoms collide, the electrons inside graphene are disturbed very little, and its electron mobility exceeds 15,000 cm at room temperature. 2 / V s, the speed of electrons reaches 1 / 300 of the speed of light, and carbon is higher than nanotubes or silicon crystals, while the resistivity is only about 10 -6 Ω cm, lower than copper and silver. [0003] The preparation methods of graphene mainly include chemical vapor deposition (CVD), oxidation intercalation re-reduction method (GO-RGO), liquid phase exfoliation method, mechanical exfoliation method, liquid phase mechanical exfoliation method...

AI Technical Summary

Problems solved by technology

The intercalation agent is a commonly used exfoliation aid in the liquid-phase mechanical physical exfoliation method. However, in the prior art, the inorganic intercalation agent is mostly a soluble salt or a surfactant, which mainly plays a role in adjusting the surface tension of the aqueous solution. After the graphene preparation process is completed It is easy to remain in graphene and affect the quality of graphene

For example, the patent with publication number CN105967179B authorizes a preparation method of graphene powder material. This method mainly uses graphene oxide as raw material, and uses an organic dispersant to disperse and peel graphene oxide. The organic dispersant will be adsorbed on graphene. It is difficult to separate from the medium, which has a great impact on the quality of graphene, and the use of organic dispersants has an impact on the electrical and thermal conductivity of graphene, affecting its application in conductive materials or graphene in lead-acid batteries

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