Preparation method of size controllable grapheme

A graphene and dimension technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problem that the electrical conductivity cannot be greatly improved, and achieve the effects of easy operation, low cost, and high yield

Inactive Publication Date: 2013-07-03
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In the process of preparing transparent conductive films, the electrical conductivity of the sample cannot be greatly improved due to the gap between small-sized graphene, which has become a major problem in the research field

Method used

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  • Preparation method of size controllable grapheme

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A method for preparing graphene with controllable size, the steps are as follows:

[0058] (1) Add 50ml of concentrated nitric acid to a mixed solution of 5g flake graphite and 150ml of concentrated sulfuric acid, stir at room temperature for 24 hours, wash with deionized water for 3 times, and dry at 60°C to obtain graphite intercalation compound;

[0059] (2) Rapidly expand the graphite interlayer compound obtained above for 30s at 1050°C to obtain expanded graphite;

[0060] (3) Slowly add 3g of potassium permanganate to the mixture of 0.3g of expanded graphite obtained above and 60ml of concentrated sulfuric acid, stir at 60°C for 24h, add 60ml of deionized water and 15ml of peroxide in an ice bath Hydrogen, the mixture is washed to neutrality to obtain graphene oxide;

[0061] (4), disperse the graphene oxide obtained above in water, and separate the graphene oxide by centrifugation;

[0062] ①. Centrifuge at 8000rmp and 40min at a rotating speed and time respect...

Embodiment 2

[0077] A method for preparing graphene with controllable size, the steps are as follows:

[0078] (1) Add 50ml of concentrated nitric acid to a mixed solution of 5g flake graphite and 150ml of concentrated sulfuric acid, stir at room temperature for 24 hours, wash with deionized water for 3 times, and dry at 60°C to obtain graphite intercalation compound;

[0079] (2) Rapidly expand the graphite interlayer compound for 30s at 1050°C to obtain expanded graphite;

[0080] (3) Slowly add 3g of potassium permanganate into the mixture of 0.3g of expanded graphite and 60ml of concentrated sulfuric acid, stir at 60°C for 24h, add 60ml of deionized water and 15ml of hydrogen peroxide in an ice bath, and The mixture is washed with water to neutrality to obtain graphene oxide;

[0081] (4) Disperse graphene oxide in water, and separate graphene oxide by centrifugation;

[0082] ①. Centrifuge at 8000rmp and 40min at a rotating speed and time respectively to obtain supernatant 1 and sed...

Embodiment 3

[0088] A method for preparing graphene with controllable size, the steps are as follows:

[0089] (1) Add 50ml of concentrated nitric acid to a mixed solution of 5g flake graphite and 150ml of concentrated sulfuric acid, stir at room temperature for 24 hours, wash with deionized water for 3 times, and dry at 60°C to obtain graphite intercalation compound;

[0090] (2) Rapidly expand the graphite interlayer compound for 30s at 1050°C to obtain expanded graphite;

[0091] (3) Slowly add 3g of potassium permanganate into the mixture of 0.3g of expanded graphite and 60ml of concentrated sulfuric acid, stir at 60°C for 24h, add 60ml of deionized water and 15ml of hydrogen peroxide in an ice bath, and The mixture is washed with water to neutrality to obtain graphene oxide;

[0092] (4) Disperse graphene oxide in water, and separate graphene oxide by centrifugation;

[0093] ①. Centrifuge at 8000rmp and 40min at a rotating speed and time respectively to obtain supernatant 1 and sed...

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Abstract

The invention discloses a preparation method of size controllable grapheme, which comprises the following steps: firstly adopting scale graphite as raw material, using concentrated H2SO4 and concentrated HNO3 for oxidizing scale graphite, gaining graphite interlayer chemical compound, then adopting thermal expansion technology to expand graphite interlayer chemical compound at high temperature and gaining expanded graphite, then oxidizing expanded graphite by adopting a modified Hummers method and gaining oxidized graphene, separating oxidized graphene through a high-speed repeated centrifuging method and gaining different sizes of oxidized graphene, at last depositing gained oxidized graphene in different sizes to the matrix, and gaining different sizes of graphene through a high-temperature thermal reduction or a low-temperature chemical reduction. The preparation method of size controllable grapheme, provided by the invention, has the advantages that different sizes of graphene can be gained in batch; and the maximal area can reach 20,000 square microns.

Description

technical field [0001] The invention relates to a graphene preparation technology, in particular to a size-controllable graphene preparation method, which is suitable for batch preparation of graphene with different sizes. Background technique [0002] Graphene refers to a single layer of carbon atoms tightly packed into a two-dimensional honeycomb lattice structure, which is the basic structural unit for building other carbon materials. Due to its unique electrical properties, mechanical properties and chemical stability, graphene will have a wide range of applications in the fields of transparent conductive films, composite materials, catalytic materials, energy storage materials, gas sensors and gas storage. Since 2004, when the research team of the University of Manchester first obtained stable graphene, graphene has rapidly become a hotspot in the research fields of materials science and condensed matter physics. [0003] At present, the methods for preparing graphene ...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/192
Inventor 郑庆彬师利芳杨俊和
Owner UNIV OF SHANGHAI FOR SCI & TECH
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