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Graphene quantum dot and preparation method thereof

A technology of graphene quantum dots and graphite powder, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as low degree of graphitization, difficulty in separating impurities, and affecting quality, and achieve high degree of graphitization and finished products High purity and good quality effect

Active Publication Date: 2019-02-12
DONGGUAN UNIV OF TECH
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  • Summary
  • 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 dot and preparation method thereof
  • Graphene quantum dot and preparation method thereof
  • Graphene quantum dot and preparation method thereof

Examples

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Embodiment 1

[0031] Example 1: Preparation of graphene quantum dots

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

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

[0034] In step 1, the graphite powder block is an industrial grade graphite powder, and the ash content of the graphite powder block of the present embodiment is not more than 0.05, the moisture content is not more than 0.02, and the carbon content is more t...

Embodiment 2

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

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

[0042] Result analysis:

[0043] figure 1 The electron micrographs of the raw graphite powder block and boron nitride, the macroscopic view 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 clear with black particles suspended. 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 milky white color. Both GQDs and BNQDs tend to precipitate and aggregate. This is the result of a small number of hydrophilic functional gr...

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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 dots are quasi-zero-dimensional nanomaterials, and the movement of their internal electrons in all directions is limited, so the quantum confinement effect is particularly significant and has many unique properties. This may revolutionize the fields of electronics, optoelectronics and electromagnetism. It is used in solar cells, electronic devices, optical dyes, biomarkers and composite particle systems. Graphene quantum dots have important potential applications in biology, medicine, materials, new semiconductor devices and other fields. It can realize single-molecule sensors, and may also lead to ultra-small transistors or on-chip communication using semiconductor lasers to make chemical sensors, solar cells, medical imaging devices, or nanoscale circuits. [0003] For...

Claims

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Application Information

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Patent Type & Authority Applications(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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