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Preparation method of vertically oriented graphene-based material

A graphene-based, vertically oriented technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of harsh conditions and high equipment requirements, achieve enhanced electrical properties, simple preparation process and experimental equipment, and facilitate large-scale The effect of mass production

Active Publication Date: 2017-08-15
SHANGHAI UNIV OF ENG SCI
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  • Abstract
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Problems solved by technology

This method requires high equipment and harsh conditions

Method used

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  • Preparation method of vertically oriented graphene-based material

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Effect test

Embodiment 1

[0020] 60 mg of graphene oxide (GO) was dissolved in 30 mL of deionized water to form a 2 mg / mL GO solution. Take a 1ml sample of the prepared 2mg / ml graphene oxide solution, and use a sand core suction filter device to prepare a graphene oxide film with an area of ​​1*1cm 2 , a graphene oxide film with a mass of 2 mg. The film was quickly frozen in liquid nitrogen, and then dried in a freeze dryer for 12 hours to obtain a vertically oriented graphene oxide material.

[0021] Morphological characterization of graphene oxide materials, the results are as follows figure 1 shown. The resistance measured by the four-probe method is shown in Table 1.

Embodiment 2

[0023] 60 mg of graphene was dissolved in 30 mL of deionized water to form a GO solution with a concentration of 2 mg / mL. Take a 1ml sample of the prepared 2mg / ml graphene solution, and use a sand core suction filter device to prepare a graphene film with an area of ​​1*1cm 2 , a graphene film with a mass of 2 mg. The film was quickly frozen in dry ice, and then dried in a freeze dryer for 12 hours to obtain a vertically oriented graphene material.

Embodiment 3

[0025] A homogeneous solution of CRGO with a concentration of 2 mg / mL was prepared by dispersing chemically reduced graphene oxide (CRGO) in ultrapure water. Take a 1ml sample of the prepared 2mg / ml CRGO solution, and use a sand core suction filter device to prepare a CRGO film with an area of ​​1*1cm 2 , a film of CRGO with a mass of 2 mg. Put the film into liquid nitrogen for rapid freezing, take it out and dry it in a freeze dryer for 12 hours to obtain a vertically oriented chemically reduced graphene oxide material. The resistance measured by the four-probe method is shown in Table 1.

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Abstract

The invention relates to a preparation method of a vertically oriented graphene-based material. The preparation method comprises following steps: 1, a graphene-based raw material is dispersed in a solvent so as to obtain a graphene-based dispersion liquid; 2, the graphene-based dispersion liquid obtained in step 1 is filtered so as to obtain a graphene-based thin film; and 3, the graphene-based thin film is subjected to rapid freezing and drying so as to obtain the vertically oriented graphene-based material. Compared with the prior art, the preparation method possesses following advantages: the preparation method is capable of controlling vertical orientation of graphene-based derivatives such as oxidized graphene, graphene, and graphene compounds, the electrical conductivity of the obtained graphene-based material is improved obviously, the preparation method and equipment are simple, and large-scale production is convenient to realize.

Description

technical field [0001] The invention relates to a method for controlling the orientation of the surface structure of a graphene-based material, in particular to a preparation method for a vertically oriented graphene-based material. Background technique [0002] Since graphene was first reported by British scientist Geim in 2004, graphene's large specific surface area, excellent electrical, mechanical, electrochemical and other properties have quickly become a research hotspot at home and abroad. Its field emission transistors, chemical / biological sensors, and energy storage etc. also show potential applications. However, graphene tends to agglomerate and accumulate due to the π-π interaction, resulting in reduced specific surface area, increased resistance, and greatly reduced performance, thereby limiting its application. In order to avoid agglomeration and improve its performance, scientists achieved it by changing the morphology of graphene. By forming graphene and its...

Claims

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Application Information

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IPC IPC(8): C01B32/198C01B32/194C01B33/12C08J5/18C08K3/04C08L29/04
CPCC01B33/12C01B2204/22C01P2004/80C01P2006/40C08J5/18C08J2329/04C08K3/04C08L29/04C08L2203/16
Inventor 张艳王玲张婧李坤陈壮
Owner SHANGHAI UNIV OF ENG SCI
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