Preparation method of monolayer graphene

A technology of single-layer graphene and graphene, applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of human body and environmental harm, severe toxicity, etc., and achieve good stability, good biocompatibility, effective Conducive to the effect of environmental protection

Active Publication Date: 2011-02-16
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the commonly used reducing agents such as hydrazine hydrate are highly toxic and can cause harm to the human body and the environment.

Method used

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  • Preparation method of monolayer graphene
  • Preparation method of monolayer graphene
  • Preparation method of monolayer graphene

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preparation example Construction

[0025] Graphene oxide is prepared by processes known to those skilled in the art. According to a preferred embodiment of the present invention, the graphene oxide solid is prepared by referring to N.I.Kovtyukhova, P.J.Ollivier, B.R.Martin, Chemistry of materials 1999, 11,771. The specific process includes: adding natural graphite powder to concentrated sulfuric acid containing potassium persulfate and phosphorus pentoxide for pre-oxidation; dispersing the pre-oxidized product in cold concentrated sulfuric acid, adding potassium permanganate and a certain amount of hydrogen peroxide The solution is processed to obtain a graphene oxide solid.

[0026] In a preferred embodiment of the present invention, the preparation steps of the graphene oxide solid include:

[0027] 30 grams of natural graphite powder were added into the concentrated sulfuric acid (45 milliliters) containing potassium persulfate (15 grams) and phosphorus pentoxide (15 grams), and reacted at 80° C. for 6 hour...

Embodiment 1

[0029] Disperse 20 mg of the above graphene oxide solid and 40 mg of polyvinylpyrrolidone in 20 ml of dimethylformamide, mix the two solutions evenly, and react at 160°C for 1 hour, cool to room temperature, filter with suction, and filter the cake Washing with a large amount of deionized water, the black product obtained is the graphene protected by polyvinylpyrrolidone, which can be dissolved in deionized water again to form a monolayer of graphene solution protected by polyvinylpyrrolidone.

Embodiment 2

[0031] Disperse 80 mg of the above-mentioned graphene oxide solid and 400 mg of polyvinylpyrrolidone in 20 ml of dimethylformamide, mix the two solutions evenly, and react at 140°C for 2 hours, cool to room temperature, suction filter, and filter cake Washing with a large amount of deionized water, the black product obtained is the graphene protected by polyvinylpyrrolidone, which can be dissolved in deionized water again to form a monolayer of graphene solution protected by polyvinylpyrrolidone.

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Abstract

The invention provides a preparation method of monolayer grapheme, in which graphene oxide solid is taken as an initial raw material. The preparation method comprises the following steps of respectively dispersing graphene oxide and a polymeric surfactant into dimethylformamide; uniformly blending the two solutions to react for 1 to 2 hours at the temperature of 140 to 160 DEG C; cooling to room temperature; filtering to obtain the graphene oxide solid; and dispersing the graphene oxide solid into water to form the monolayer graphene protected by polymers. In the preparation of the monolayer grapheme according to the method of the invention, a common toxic and harmful reducing agent in the prior art is omitted; the thermal reduction of the graphene oxide is carried out; the organic solvent dimethylformamide has the assistance action in the process of reduction; and the method has the advantages of no pollution on environment, simple technique, low raw material cost and available raw materials, is beneficial to environment protection, convenient for operation and suitable for low-cost and mass production.

Description

technical field [0001] The invention relates to a preparation method of nanomaterials, in particular to a preparation method of single-layer graphene. Background technique [0002] Graphene is a new two-dimensional honeycomb carbonaceous material formed by densely packed carbon atoms. The thickness of the crystal film is only 0.335nm, which is only 1 / 200,000th that of hair. It is the basic unit for constructing other dimensional carbon materials. , which can be warped into zero-dimensional fullerenes, rolled into one-dimensional carbon nanotubes or stacked into three-dimensional graphite and diamond. The theoretical specific surface area of ​​graphene is as high as 2630m 2 / g, outstanding thermal conductivity (5000W / (m K)), excellent mechanical properties, Young's modulus up to 1100GPa, fracture strength up to 125GPa, and high-speed electron mobility at room temperature. Graphene's unique structure makes it have a series of properties such as perfect quantum tunneling effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82B3/00
Inventor 张玉杰张欢胡文兵樊春海黄庆
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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