Preparation method for graphene

A graphene and graphite technology, applied in the field of graphene preparation, can solve the problems of small output and incapable of large-scale production, and achieve the effects of low cost, large industrial application potential, and increased application range

Inactive Publication Date: 2016-02-24
SHANDONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

Chinese patent (patent number: CN103910354) specifically proposes the preparation of graphene by liquid-phase ultrasonic exfoliation, but although

Method used

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  • Preparation method for graphene

Examples

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Example Embodiment

[0025] Example 1

[0026] The first step is to disperse 10g of natural graphite into 500ml of organic solvent 1-methyl-2-pyrrolidone (NMP) according to the ratio in Table 1, to obtain a graphite suspension with a concentration of 20g / l. The carbon content of natural graphite It is more than 98% graphite powder.

[0027] In the second step, the obtained graphite suspension was sheared in a colloid mill for 5 min. The colloid mill was a JM-5 emulsified asphalt tester with a pressure of 0.1 MPa, and then the sheared graphite suspension was taken out.

[0028] In the third step, the prepared graphite suspension is centrifuged, the centrifuge speed is 500 rpm, and the centrifugation time is 10 min. The supernatant is collected, and then the supernatant is vacuum filtered and dried to obtain graphene. The quality, concentration, yield and efficiency of the prepared graphene are shown in Table 2, as figure 2 The graphene monolayer structure prepared by the present invention is obvious, th...

Example Embodiment

[0029] Example 2

[0030] In the first step, according to the proportional relationship in Table 1, 30 g of natural graphite was dispersed in 500 ml of organic solvent 1-methyl-2-pyrrolidone (NMP) to obtain a graphite suspension with a concentration of 60 g / l.

[0031] The second step is the same as the second step in Example 1.

[0032] The third step is the same as the third step in Example 1. The quality, concentration, yield and efficiency of the graphene prepared are shown in Table 2.

Example Embodiment

[0033] Example 3

[0034] The first step is to disperse 1.8g of natural graphite into 600ml of water in the surfactant sodium dodecylbenzene sulfonate solution according to the ratio in Table 1, to obtain a graphite suspension with a concentration of 3g / l, of which 12 The ratio of the concentration of sodium alkylbenzene sulfonate to the concentration of initial graphite is 1 / 8.

[0035] In the second step, the obtained graphite suspension was poured into a colloid mill and mechanically sheared for 5 minutes at a pressure of 0.1 MPa, and then the graphite suspension after the shearing was taken out.

[0036] In the third step, the prepared graphite suspension is centrifuged (centrifugation speed is 1000 rpm, centrifugation time is 10 min) and the supernatant is collected, and then the supernatant is vacuum filtered, washed, and dried to obtain graphene . The quality, concentration, yield and efficiency of the graphene prepared are shown in Table 2.

[0037] Such as image 3 As shown...

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Abstract

The invention provides a preparation method for graphene. The preparation method comprises: S1, dispersing natural graphite in a solvent to obtain a graphite suspension; S2, shearing the graphite suspension in a colloid mill; and S3, carrying out centrifugal separation on the sheared graphite suspension to obtain a supernatant, and carrying out vacuum suction filtration and drying on the supernatant to obtain graphene. By using the natural graphite powders which are wide in raw material source and cutting the graphite with the colloid mill, graphite granules can be effectively stripped through a physical action of a severe shear force, a frictional force, high-frequency vibration and high-speed vortex, so that the production efficiency is greatly improved and the graphene can be industrially prepared in batches. Meanwhile, the prepared graphene is few in defect, high in yield, low in cost, good in dispersity and high in quality, and the application range of the graphene is greatly expanded.

Description

technical field [0001] The invention belongs to the technical field of graphene preparation, and relates to a preparation method of graphene. Background technique [0002] Graphene (graphene) is the basic structural unit of natural graphite. It is a single-layer sheet structure composed of carbon atoms arranged in a honeycomb order. The thickness is only 0.335nm. The best material. Graphene has a two-dimensional hexagonal lattice structure formed by a single layer of carbon atoms closely arranged, with a specific surface area of ​​2600m 2 / g. Graphene has excellent electrical conductivity and physical and mechanical properties, the lateral (in-plane) electrical conductivity is as high as 106S / m, and the carrier mobility is as high as 15000cm 2 / (V·S), the ultimate strength can reach 130GPa, the tensile modulus is 1.01TPa, and the thermal conductivity is good, the thermal conductivity is 5000W / (m·K). Therefore, graphene has broad application prospects in polymer composite...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 刘欣马勇何海峰赵丽芬管勇徐志翠万振高王乐英
Owner SHANDONG UNIV OF SCI & TECH
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