Preparation method of suspension liquid and powder of graphene quantum dot

A technology of graphene quantum dots and suspensions, which is applied in the field of photoelectric technology and biomarkers, and can solve the problems of low yield of quantum dots, expensive price of graphene quantum dots, and uneven size distribution of quantum dots.

Active Publication Date: 2014-12-17
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process, the large size must be removed by high-speed centrifugation to obtain nano-sized quantum dots. Such a preparation process leads to a very low yiel

Method used

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  • Preparation method of suspension liquid and powder of graphene quantum dot
  • Preparation method of suspension liquid and powder of graphene quantum dot
  • Preparation method of suspension liquid and powder of graphene quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Weigh 0.5g of C60 powder, measure 10ml of concentrated sulfuric acid with a mass fraction of 98%, mix the C60 powder and concentrated sulfuric acid in a beaker, and place the beaker in an ice-water bath while stirring at a speed of 100rpm.

[0030] (2) Weigh 3g of potassium permanganate powder, and slowly add it to the mixed solution in step 1.

[0031] (3) Remove the ice-water bath and replace it with a water bath, keep the temperature of the water bath at 20 degrees, and react for 24 hours.

[0032] (4) Quickly add 50ml of pure water.

[0033] (5) The suspension obtained in step (4) was filtered, and then dialyzed for 3 days with a dialysis bag with a molecular weight cut off of 8000.

[0034] (6) Dry the suspension obtained in step (5) at room temperature to finally obtain 0.112g graphene quantum dot powder.

[0035] figure 1 Shown the suspension of the graphene quantum dot that step (5) obtains.

Embodiment 2

[0037] (1) Weigh 0.5g of C60 powder, measure 25ml of concentrated sulfuric acid with a mass fraction of 98%, mix the C60 powder and concentrated sulfuric acid in a beaker, and place the beaker in an ice-water bath while stirring at a speed of 300rpm.

[0038] (2) Weigh 1.75g ​​of potassium permanganate powder, and slowly add it to the mixed solution in step 1.

[0039] (3) Remove the ice-water bath and replace it with a water bath, keep the temperature of the water bath at 25 degrees, and react for 24 hours.

[0040] (4) Quickly add 75ml of pure water.

[0041] (5) The suspension obtained in step (4) was filtered, and then dialyzed for 7 days with a dialysis bag with a molecular weight cut off of 500.

[0042](6) The suspension obtained in step (5) was dried in a freeze dryer to finally obtain 0.128g graphene quantum dot powder.

[0043] image 3 Shown the optical picture of the graphene quantum dot that step (6) obtains; Figure 4 An atomic force microscope scan showing g...

Embodiment 3

[0045] 1) Weigh 0.5g of C60 powder, measure 100ml of concentrated sulfuric acid with a mass fraction of 98%, mix the C60 powder and concentrated sulfuric acid in a beaker, and place the beaker in an ice-water bath while stirring at a speed of 300rpm.

[0046] (2) Weigh 0.5g of potassium permanganate powder, and slowly add it to the mixed solution in step 1.

[0047] (3) Remove the ice-water bath and replace it with a water bath, keep the temperature of the water bath at 40 degrees, and react for 1 hour.

[0048] (4) Quickly add 200ml of pure water.

[0049] (5) The suspension obtained in step (4) was filtered, and then dialyzed for 5 days with a dialysis bag with a molecular weight cut off of 1000.

[0050] (6) The suspension obtained in step (5) was dried in a freeze dryer to finally obtain 0.108g graphene quantum dot powder.

[0051] Figure 6 The transmission electron microscope image of the graphene quantum dot obtained in step (6) is shown, and the size distribution of...

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Abstract

The invention discloses a preparation method of a suspension liquid and a powder of graphene quantum dots. The method includes following steps: preparing the suspension liquid of the graphene quantum dots in one step from fullerene in a manner of chemical oxidation cleavage, removing impurity ions from the suspension liquid, and then performing a drying process to obtain the powder of the graphene quantum dots. In the invention, problems of complex technology and high cost in preparation of the suspension liquid and the powder of the graphene quantum dots are solved. The preparation method is simple in operation, can quickly prepare the suspension liquid and the powder of the graphene quantum dots in macro scale in an amplifying manner and is high in yield. The graphene quantum dots are uniform in size distribution and are excellent in water solubility.

Description

technical field [0001] The invention belongs to the fields of optoelectronic technology and biomarkers, and in particular relates to a method for preparing quantum dots, more particularly to a method for preparing large quantities of graphene quantum dot suspensions and powders. Background technique [0002] Graphene has received extensive attention since it was discovered in 2004 due to its excellent electrical, thermal, mechanical, and optical properties. But graphene is a zero-bandgap material, which limits its application in the fields of semiconductor devices and optoelectronic devices. Graphene quantum dots reduce the size to the nanometer scale and use the quantum localization effect to open the band gap, thereby making the transition and recombination of electrons possible, and expanding the application of graphene in the field of optoelectronics and biomarkers. [0003] The existing methods for preparing graphene quantum dots generally start from precursors such as...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 朱彦武陈冠雄
Owner UNIV OF SCI & TECH OF CHINA
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