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Graphene quantum dots and preparation method thereof

A graphene quantum dot, graphite powder technology, applied in graphene, chemical instruments and methods, nano-carbon and other directions, can solve the problems of difficult separation of impurities, low degree of graphitization, affecting quality, etc., and achieve high purity and graphitization of finished products. High-level, good-quality results

Active Publication Date: 2020-08-28
DONGGUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the bottom-up synthesis, the products often have problems such as low degree of graphitization and difficult separation of impurities. However, in the top-down method, most of them need to use graphene as the material and undergo various cutting treatments, so the cost is high. Products often contain a large number of oxygen-containing photophores and defects, which will seriously affect the quality when used in electronic devices

Method used

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  • Graphene quantum dots and preparation method thereof
  • Graphene quantum dots and preparation method thereof
  • Graphene quantum dots and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: the preparation of graphene quantum dot

[0032] The preparation method of graphene quantum dots comprises the following steps: ① take graphite powder block and mechanically mix with molten salt catalyst; ② take the mixed material in step ①, preheat and keep it warm; ③ take the mixed material in step ② after heat preservation and directly heat up and heat preservation; ④ cooling the mixture in step ③ to room temperature, soaking in water to obtain the suspension; ⑤ taking the suspension in step ④, and obtaining the graphene quantum dot product through centrifugal filtration.

[0033] In step ①, the mass ratio of graphite powder block to molten salt catalyst is 1:2 to 1:8, preferably 1:5 in this embodiment.

[0034] In step ①, the graphite powder is industrial grade graphite powder. The ash content of the graphite powder in this embodiment is not more than 0.05, the moisture is not higher than 0.02, the carbon content is more than 99%, and the mesh is 500-1...

Embodiment 2

[0040] Embodiment 2: Preparation of boron nitride quantum dots

[0041] The preparation method of boron nitride quantum dots, the raw material is hexagonal boron nitride, and the rest are the same as in embodiment 1.

[0042] Result analysis:

[0043] figure 1 It is the electron micrograph of the raw material graphite powder block and boron nitride, the macroscopic picture of the product solution and the schematic diagram of the reaction.

[0044] Depend on figure 1 It can be seen that the schematic preparation process of graphene quantum dots and boron nitride quantum dots. Diluted GQDS (5 mg / ml) was transparent with black particles in suspension. The low water solubility and metallic luster indicate that it has less hydrophilic functional groups, which is completely different from the previously reported carbon quantum dots (CQDS). BNQDs (5mg / ml) showed a milky white color. Both GQDs and BNQDs tend to precipitate and aggregate. This is the result of the small number o...

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Abstract

The invention relates to the field of graphene quantum dots, and particularly relates to a graphene quantum dot and a preparation method thereof. The preparation method of the graphene quantum dot comprises the following steps: (1), taking a graphite powder block to mechanically mix with a molten salt catalyst; (2), taking a mixed material in the step (1) to carry out preheating treatment and heatpreservation; (3), taking the mixed material subjected to the heat preservation in the step (2) to directly heat up and carry out the heat preservation; (4), cooling the mixed material in the step (3) to the room temperature, and then carrying out water immersion treatment to obtain suspension liquid; and (5), taking suspension liquid in the step (4), and carrying out centrifugal filtration to obtain a graphene quantum dot product. The preparation method of the graphene quantum dot, which is provided by the invention, has the advantages of low manufacturing cost, high graphitization degree, and good finished-product quality, and is applicable to large-scale production.

Description

technical field [0001] The invention relates to the field of graphene quantum dots, in particular to a graphene quantum dot and a preparation method thereof. Background technique [0002] Graphene quantum dot (Graphene quantum dot) is a quasi-zero-dimensional nanomaterial, and the movement of electrons in it is restricted in all directions, so the quantum confinement effect is particularly significant and has many unique properties. This could revolutionize the fields of electronics, optoelectronics and electromagnetism. It is used in solar cells, electronic devices, optical dyes, biomarkers and composite particle systems, etc. Graphene quantum dots have important potential applications in the fields of biology, medicine, materials, and new semiconductor devices. It can realize single-molecule sensors, and it may also lead to ultra-small transistors or on-chip communication using semiconductor lasers to make chemical sensors, solar cells, medical imaging devices, or nanosc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B32/184C01B2204/30C01B2204/32
Inventor 孙成华尹意淳徐勇军
Owner DONGGUAN UNIV OF TECH
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