Preparation method of graphene uniform dispersion

Abstract

The invention relates to a preparation method of graphene uniform dispersion, belonging to the technical field of new nano materials. The preparation method comprises the following steps of: (1) preparing aqueous surfactant solution with the concentration of 0.2-20g / L; (2) mixing raw graphite powder with the aqueous surfactant solution according to the concentration of 1-100g / L, forming suspension and adding the suspension into a high-pressure reactor with strirring; (3) adjusting the rotating speed of the high-pressure reactor to be 50-300rpm and the temperature in the reactor to be 100-300 DEG C, carrying out heat preservation treatment on the raw graphite powder for 5-24 hours and then taking out paste; (4) carrying out 1000-2000rpm centrifugation on the paste for 15-45 minutes, and obtaining supernatant solution which is the dispersion with one-layer and multilayer graphene. The preparation method has the advantages that the aqueous surfactant solution used in the preparation process can be recycled without exhaust emission; the used materials are non-corrosive, non-toxic, non-flammable and non-explosive products; the process can not cause large damage to the protogenic conjugated structure of the graphene; and the low cost can be realized, and the graphene dispersion with excellent dispersity and stability can be prepared.

Description

Technical field [0001] The invention relates to the technical field of nano new materials, in particular to a method for preparing a graphene uniform dispersion. Background technique [0002] Since the discovery of graphene in 2004, it has been generally favored by researchers from the fields of physics and materials. Graphene is a two-dimensional honeycomb lattice structure carbonaceous material composed of a single layer of carbon atoms closely packed. Although graphene is only one layer of carbon atoms thick and is the thinnest of the known materials, it is very strong and hard. Graphene is also the most conductive material currently known. In addition, graphene has many excellent properties, such as high thermal conductivity, huge specific surface area and so on. Due to the special properties of graphene, it has broad application prospects in electronics, optics, magnetism, biomedicine, sensors, and energy storage. In order to apply graphene to the above-mentioned fields,...

AI Technical Summary

Problems solved by technology

Due to the use of strong oxidants such as oleum, nitric acid, and potassium permanganate in the oxidation stage, and the use of toxic, flammable and explosive strong reducing agents such as hydrazine hydrate, metal sodium and potassium, hydroquinone, and sodium borohydride in the reduction stage, this This method will encounter serious problems such as wastewater treatment, fire and explosion protection in the process of large-scale production, and at the same time, the complex process and high raw material prices will also make the production cost face challenges

The CVD method can prepare single-layer or low-layer graphene materials in a large area (centimeter scale), which has great application potential in device manufacturing, but the size of the graphene film is still limited by the transition metal substrate (Cu, Ni, Ru etc.), and the film transfer process is complex, how to maintain the stability of product performance will be the key to mass manufacturing of devices

Images