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Low-cost graphene quantum dot preparation method

A low-cost technology of graphene quantum dots, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of serious pollution and production costs, and achieve good monodispersity, environmental friendliness, and non-toxic effects

Inactive Publication Date: 2018-07-20
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, this preparation method must use graphene oxide as a raw material for production, and the preparation of graphene oxide must go through the action of strong oxidizing acids such as nitric acid or sulfuric acid, resulting in serious pollution and high preparation costs.

Method used

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  • Low-cost graphene quantum dot preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Take by weighing 0.2g coal tar pitch (it should be noted that it must be coal tar pitch, and other pitches are invalid) at room temperature and put it into a 200ml flask, add 200ml mass concentration of 15% hydrogen peroxide solution, then put the flask Put it into a 500w ultrasonic cleaner for 2h to obtain a dispersion of coal tar pitch; transfer it to a 500ml round bottom flask, reflux for 2h under heating with a heating mantle (liquid temperature is 110°C), cool to room temperature, and obtain GQDs -1 crude product; filter the obtained crude product with a 0.22 μm microporous membrane to obtain a GQDs-1 aqueous solution, which is freeze-dried to obtain a brown solid GQDs-1.

[0050] The coal tar pitch that above-mentioned method uses is preferably the coal tar pitch that boiling point is more than 360 ℃; SEM ( figure 2 a) shows that the coal tar pitch used exhibits irregular size and shape, ranging from 1 μm to 20 μm in diameter; TEM ( figure 2 b) shows that the c...

Embodiment 2

[0054] Weigh 0.2g of coal tar pitch at room temperature and put it into a 200ml flask, add 200ml of hydrogen peroxide solution with a mass concentration of 30%, then put the flask into a 500w ultrasonic cleaner for 2 hours to obtain a dispersion of coal tar pitch It is transferred to a 500ml round-bottomed flask, refluxed for 2h (liquid temperature is 110° C.) under the heating of a heating mantle, and cooled to room temperature to obtain the crude product of GQDs-2; Filtration was performed to obtain an aqueous solution of GQDs-2, which was freeze-dried to obtain GQDs-2 as a pale yellow solid.

[0055] The above-mentioned GQDs-2 aqueous solution is transparent and colorless under natural light irradiation, and is blue under ultraviolet light; TEM ( Figure 9 a) and size distribution histogram ( Figure 9 b) shows that the as-prepared GQDs-2 are monodisperse with uniform size and shape, and its diameter is 2.3±0.7nm; HRTEM( Figure 9 c) shows that the as-prepared GQDs-2 is h...

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Abstract

The invention discloses a low-cost graphene quantum dot preparation method, which comprises the following steps of S1, weighing a first preset quantity of carbon-containing raw materials; putting thematerials into a reaction container; S2, weighing a second preset quantity of oxidizing agents; adding the oxidizing agents into the reaction container; S3, performing ultrasonic dispersion treatmenton the mixed solution in the reaction container; S4, heating the mixed solution in the reaction container at the preset temperature; S5, cooling products after the reaction. The steps in the preparation process are simple; the slashing reagent / reaction conditions and post treatment purification procedures are not needed; the yield is as high as 80 percent or higher; the expansion to mass production in an environment-friendly mode can be realized. The prepared graphene quantum dots can be stably dispersed into water; the characteristics of single dispersion, stable structure, few impurities andthe like are realized.

Description

technical field [0001] The invention belongs to the technical field of graphene material preparation, in particular to a method for hydrothermally preparing coal tar pitch-based graphene quantum dots. Background technique [0002] Since Geim and Novoselov et al. used adhesive tape to exfoliate atomically thin graphene from graphite blocks in 2004, graphene has attracted increasing attention due to its unique properties. However, graphene is a zero-bandgap material, and the possibility of observing its light emission is almost impossible, which hinders its application in optoelectronics. As the latest member of the graphene family, graphene quantum dots (GQDs), as a new type of quantum dots, have emerged and aroused great research interest. Due to their remarkable quantum confinement effect, GQDs possess many novel chemical / physical properties. In addition, GQDs also show low cytotoxicity, excellent solubility, chemical inertness, stable photoluminescence, and better surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184B82Y40/00
CPCB82Y40/00C01B2204/30C01B2204/32
Inventor 刘全润张敬杰邢宝林黄光许张传祥马名杰赵会会李海鹏贺贺
Owner HENAN POLYTECHNIC UNIV
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