A kind of method for preparing graphene quantum dots from carbohydrate precursors at low temperature

A graphene quantum dot and precursor technology, applied in the field of materials, can solve the problems of harsh reaction conditions, high cost, environmental pollution, etc., and achieve the effect of large-scale preparation

Active Publication Date: 2021-01-22
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method of graphene quantum dots usually requires harsh reaction conditions, which will pollute the environment, and the cost is high

Method used

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  • A kind of method for preparing graphene quantum dots from carbohydrate precursors at low temperature
  • A kind of method for preparing graphene quantum dots from carbohydrate precursors at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Add 15 grams of glucose to 150 ml of commercially available 30% concentrated ammonia water, completely dissolve it, and react under heating at 80°C for 6 hours to obtain a mother solution of graphene quantum dots containing nitrogen atoms.

[0019] (2) Filter the graphene quantum dot mother liquor obtained in (1) with a 0.22-micron microporous membrane, add the lower liquid into a dialysis bag with a molecular weight cut-off of 3500, and dialyze for 3 days to obtain an aqueous solution of graphene quantum dots.

[0020] (3) Quenching the graphene quantum dot aqueous solution obtained in (2) with liquid nitrogen, and freeze-drying in a freeze dryer to obtain graphene quantum dot powder.

Embodiment 2

[0022] (1) Add 15 grams of glucose into 150 milliliters of 1 mol / liter sodium hydroxide aqueous solution, dissolve completely, and react under heating at 70°C for 4 hours to obtain graphene quantum dot mother liquor.

[0023] (2) Filter the graphene quantum dot mother liquor obtained in (1) with a 0.22-micron microporous membrane, add the lower liquid into a dialysis bag with a molecular weight cut-off of 3500, and dialyze for 3 days to obtain an aqueous solution of graphene quantum dots.

[0024] (3) Spray drying the graphene quantum dot aqueous solution obtained in (2) to obtain graphene quantum dot powder.

Embodiment 3

[0026] (1) Add 15 grams of glucose into 150 milliliters of 1 mol / liter potassium hydroxide aqueous solution, dissolve completely, and react under heating at 70°C for 4 hours to obtain graphene quantum dot mother liquor.

[0027] (2) Filter the graphene quantum dot mother liquor obtained in (1) with a 0.22-micron microporous membrane, add the lower liquid into a dialysis bag with a molecular weight cut-off of 3500, and dialyze for 3 days to obtain an aqueous solution of graphene quantum dots.

[0028] (3) Spray drying the graphene quantum dots obtained in (2) to obtain graphene quantum dot powder.

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Abstract

The invention provides a method for preparing graphene quantum dots from a sugar precursor at a low temperature, namely, a method for preparing the water-soluble graphene quantum dots with heteroatoms and adjustable fluorescence properties. According to the method, sugar is taken as a raw material, and the method is performed in an alkaline solution at a lower temperature. The method comprises the following specific steps: adding the sugar precursor to the alkaline solution for reaction for a certain time under the condition of heating, and obtaining a graphene quantum dot aqueous solution through dialysis and filtration treatment; obtaining graphene quantum dot bodies after drying. The method has the advantage that price of the raw materials is low, reaction conditions are mild, reaction under high pressure is not needed, a reaction liquid can be used repeatedly, and environmental pollution is avoided. Most of the obtained graphene quantum dots are of a single atomic layer structure and have variable fluorescence properties. The prepared graphene quantum dots can be applied to the fields of biological imaging, dyeing, photocatalysis, photoelectric devices and the like. Besides, prepared graphene quanta can also be composited with other materials for preparing a multifunctional composite material.

Description

technical field [0001] The invention belongs to the field of material technology, and relates to a method for preparing graphene quantum dots from sugar precursors at low temperature, specifically, the sugar precursors are reacted at low temperature in an alkaline solution for a period of time to obtain graphene quantum dot mother liquor; Dialyzing and filtering to remove impurities to obtain graphene quantum dot aqueous solution; drying the obtained solution to obtain graphene quantum dot powder. Background technique [0002] Since its discovery, graphene has attracted widespread attention due to its excellent comprehensive properties. However, the perfect graphene is a zero-bandgap material, so it is difficult to fluoresce, which limits the application of graphene in the fields of biology, photocatalysis, and optoelectronic materials. In order to expand the application fields of graphene, it is an important research area to make graphene emit variable fluorescence by tuni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65C01B32/184B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C01B2204/20C01P2004/64C01P2006/60C09K11/65
Inventor 卢红斌张佳佳陈宇菲潘运梅林珊
Owner FUDAN UNIV
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