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Preparation method and application of graphene quantum dots and device or apparatus containing graphene quantum dots

A technology of graphene quantum dots and flake graphite, which is applied in the field of preparation of graphene quantum dots, can solve the problems of adding a large amount of reagents and spending several days, achieve less reagent consumption, shorten reaction time, and reduce operation difficulty and danger sexual effect

Active Publication Date: 2019-06-28
TONGREN UNIV
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  • Description
  • Claims
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Problems solved by technology

However, the disadvantage of the hydrothermal method is that the method is based on the raw material GO and its reduction products, which not only requires the oxidation of a large amount of graphite powder to obtain GO, but also requires a series of complex redox reactions, and the reduction The process also typically requires the addition of large quantities of reagents and takes days

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  • Preparation method and application of graphene quantum dots and device or apparatus containing graphene quantum dots

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[0029] The preparation method provided by the present invention uses flake graphite as raw material to prepare graphene quantum dots. In the prior art, the preparation of graphene quantum dots mostly uses graphene oxide as a raw material (for details, see CN102807209A, etc.), and there are also related projects that use fullerene (for details, see CN104211050A) and coal (for details, see CN103803540A) as raw materials. Prepare to try. However, there are few related studies on the preparation of graphene quantum dots from flake graphite, a layered graphite, as a raw material. Therefore, the proposal of the present invention can not only solve the problems of many reaction steps, long reaction time, and high reagent consumption in the preparation of graphene quantum dots by the traditional hydrothermal method, but also a new attempt and exploration for the preparation of graphene quantum dots. .

[0030] Specifically, the preparation method of the present invention comprises t...

Embodiment 1

[0066] (1) Take 1.2g flake graphite and put it into a 500ml beaker, add 50ml concentrated sulfuric acid, and stir magnetically at room temperature for 30min.

[0067] (2) Place the beaker in a bucket with ice cubes inside, place it on a magnetic stirrer, keep stirring in an ice bath, add 1.5g of sodium nitrate; add potassium permanganate in 5 times, add once every 10 minutes, each time Add 1.2g (control the reaction temperature not to exceed 3°C); keep stirring in an ice bath, and react for 2 hours.

[0068] (3) Take out the beaker, place it in a heat-collecting water bath, and react with stirring for 24 hours under the condition of a water bath at 35°C.

[0069] (4) Keep the ice bath state, add 70ml of distilled water to the beaker (slowly dropwise, keep the temperature of the reactant not exceeding 50°C), after the dilution is completed, place the beaker again in the heat-collecting water bath, under the condition of 85°C water bath , and stirred for 15 minutes.

[0070] (...

Embodiment 2

[0074] (1) Put 2g of graphite flakes into a 500ml beaker, add 50ml of concentrated sulfuric acid, and stir magnetically at room temperature for 30min.

[0075] (2) Place the beaker in a bucket with ice cubes, place it on a magnetic stirrer, keep stirring in an ice bath, add 2g of sodium nitrate, add 1.5g of potassium permanganate in 5 times every 10 minutes; keep stirring in an ice bath , reacted for 2 hours.

[0076] (3) Take out the beaker, place it in a heat-collecting water bath, and react with stirring for 24 hours under the condition of a water bath at 35°C.

[0077] (4) Keeping in the ice bath state, add 70ml of distilled water to the beaker. After the dilution is completed, place the beaker in a heat-collecting water bath again, and stir and react for 15 minutes under the condition of a water bath at 85°C.

[0078] (5) Take out the beaker, add 50ml of distilled water to it again for dilution, and finally add 30% hydrogen peroxide solution dropwise in the beaker until ...

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Abstract

The invention provides a preparation method and application of graphene quantum dots and a device or apparatus containing the graphene quantum dots. The preparation method comprises the steps that after flake graphite reacts with concentrated sulfuric acid, nitrate and potassium permanganate are added to continue the reaction, hydrogen peroxide is added after water is added into a reaction systemfor dilution, and obtained precipitate as the graphene quantum dots. Compared with a traditional hydrothermal method, the required reaction time of the preparation method is greatly shortened, a high-temperature reaction is not needed, and the operation difficulty and risk of the reaction are reduced; meanwhile, the dosage of reagents required by the preparation method is small, post-treatment steps are simple and convenient, and the method is suitable for large-scale production of the graphene quantum dots.

Description

technical field [0001] The invention relates to the field of carbon-based materials, in particular to a preparation method and application of graphene quantum dots and devices or devices containing them. Background technique [0002] As the latest member of the graphene family, zero-dimensional graphene quantum dots (Graphene quantum dots, GQDs) not only have the excellent properties of ordinary graphene materials, but also have stronger quantum confinement effects and Boundary effects, and can exhibit a series of new characteristics. Graphene quantum dots have broader application prospects in the fields of solar photovoltaic devices, biomedicine, light-emitting diodes, and sensors. [0003] GQDs have gradually become the focus of scientists in various fields in recent years, but their development is still in its infancy, and the synthesis process has only begun to be studied in depth in the past two or three years. The synthesis methods of GQDs mainly include hydrothermal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/196
Inventor 张仁辉彭松冷森林
Owner TONGREN UNIV
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