Preparation method of graphene

Abstract

The invention discloses a preparation method of graphene. Specifically, graphite oxide prepared by existing technology is dispersed in a green reducing agent, and oxygen on the graphite oxide is removed through an unbalance reaction in hot water, so that the graphite oxide is reduced into graphene. The graphene prepared by the method provided by the invention has low oxygen content and high conductivity; the method has advantages of simple operation, low cost and high efficiency, and really realizes graphene preparation in kilogram level; no reducing agent severely harmful to the environment or strongly toxic is used; therefore, the method causes no environmental pollution, greatly simplifies the growth process, suits industrial production, and has potential application value in the fields based on graphene.

Description

technical field

[0001] The invention belongs to the technical field of chemical synthesis, in particular to a method for preparing graphene, in particular to a method for preparing kilogram-level graphene powder. Background technique

[0002] In 2004, Graphene, discovered by Professor Geim of the University of Manchester, is a new carbonaceous material that consists of a single layer of carbon atoms tightly packed into a two-dimensional honeycomb structure. Theoretical research found that graphene has a thickness of 200,000 cm 2 / Vs carrier mobility. The movement speed of electrons in graphene reaches 1 / 300 of the speed of light, and its conductivity can be compared with that of metal copper. In addition, graphene has large catalytic properties due to its large specific surface area, and is widely used in the fields of energy and catalysis, such as lithium-ion batteries, supercapacitors, etc.

[0003] The preparation methods of graphene that have been studied so far mainl...

Examples

Embodiment 1

[0020] Embodiment one, adopt water to prepare graphene as green reducing agent reduction graphite oxide, its specific steps are as follows:

[0021] Put 0.5g of graphite oxide in 40ml of water and ultrasonically disperse; put the above-mentioned mixture of graphite oxide and water in a 50ml hydrothermal reaction kettle, and keep it at 180 degrees for 12 hours; after natural cooling, the water after hydrothermal reaction And graphene mixture is filtered to obtain graphene.

[0022] The graphene obtained by this embodiment has a ratio of oxygen atoms to carbon atoms of 10%, and a ratio of Raman D peak intensity to G peak intensity of 0.8, showing that graphite oxide has been well reduced.

Embodiment 2

[0023] Embodiment two, adopt ethanol as green reducing agent to reduce graphite oxide to prepare graphene, and its specific steps are as follows:

[0024] Put 1g of graphite oxide in 40ml of ethanol and ultrasonically disperse; put the above-mentioned mixture of graphite oxide and ethanol in a 100ml hydrothermal reaction kettle, and keep it at 100 degrees for 12 hours; after natural cooling, the ethanol after hydrothermal reaction And graphene mixture is filtered to obtain graphene.

[0025] The graphene obtained by this embodiment has a ratio of oxygen atoms to carbon atoms of 8%, and a ratio of Raman D peak intensity to G peak intensity of 0.7, showing that graphite oxide has been well reduced.

Embodiment 3

[0026] Embodiment three, adopt acetic acid to prepare graphene as green reducing agent reduction graphite oxide, its specific steps are as follows:

[0027] Place 0.3g of graphite oxide in 40ml of acetic acid and ultrasonically disperse; place the mixture of the above-mentioned graphite oxide and acetic acid in a 80ml hydrothermal reaction kettle, and keep it at 130 degrees for 12 hours; after natural cooling, the hydrothermal reaction The mixture of acetic acid and graphene is filtered to obtain graphene.

[0028] The graphene obtained by this embodiment has a ratio of oxygen atoms to carbon atoms of 14%, and a ratio of Raman D peak intensity to G peak intensity of 0.9, showing that graphite oxide has been well reduced.

technical field

[0001] The invention belongs to the technical field of chemical synthesis, in particular to a method for preparing graphene, in particular to a method for preparing kilogram-level graphene powder. Background technique

[0002] In 2004, Graphene, discovered by Professor Geim of the University of Manchester, is a new carbonaceous material that consists of a single layer of carbon atoms tightly packed into a two-dimensional honeycomb structure. Theoretical research found that graphene has a thickness of 200,000 cm 2 / Vs carrier mobility. The movement speed of electrons in graphene reaches 1 / 300 of the speed of light, and its conductivity can be compared with that of metal copper. In addition, graphene has large catalytic properties due to its large specific surface area, and is widely used in the fields of energy and catalysis, such as lithium-ion batteries, supercapacitors, etc.

[0003] The preparation methods of graphene that have been studied so far mainl...

Examples

Embodiment 1

[0020] Embodiment one, adopt water to prepare graphene as green reducing agent reduction graphite oxide, its specific steps are as follows:

[0021] Put 0.5g of graphite oxide in 40ml of water and ultrasonically disperse; put the above-mentioned mixture of graphite oxide and water in a 50ml hydrothermal reaction kettle, and keep it at 180 degrees for 12 hours; after natural cooling, the water after hydrothermal reaction And graphene mixture is filtered to obtain graphene.

[0022] The graphene obtained by this embodiment has a ratio of oxygen atoms to carbon atoms of 10%, and a ratio of Raman D peak intensity to G peak intensity of 0.8, showing that graphite oxide has been well reduced.

Embodiment 2

[0023] Embodiment two, adopt ethanol as green reducing agent to reduce graphite oxide to prepare graphene, and its specific steps are as follows:

[0024] Put 1g of graphite oxide in 40ml of ethanol and ultrasonically disperse; put the above-mentioned mixture of graphite oxide and ethanol in a 100ml hydrothermal reaction kettle, and keep it at 100 degrees for 12 hours; after natural cooling, the ethanol after hydrothermal reaction And graphene mixture is filtered to obtain graphene.

[0025] The graphene obtained by this embodiment has a ratio of oxygen atoms to carbon atoms of 8%, and a ratio of Raman D peak intensity to G peak intensity of 0.7, showing that graphite oxide has been well reduced.

Embodiment 3

[0026] Embodiment three, adopt acetic acid to prepare graphene as green reducing agent reduction graphite oxide, its specific steps are as follows:

[0027] Place 0.3g of graphite oxide in 40ml of acetic acid and ultrasonically disperse; place the mixture of the above-mentioned graphite oxide and acetic acid in a 80ml hydrothermal reaction kettle, and keep it at 130 degrees for 12 hours; after natural cooling, the hydrothermal reaction The mixture of acetic acid and graphene is filtered to obtain graphene.

[0028] The graphene obtained by this embodiment has a ratio of oxygen atoms to carbon atoms of 14%, and a ratio of Raman D peak intensity to G peak intensity of 0.9, showing that graphite oxide has been well reduced.