Preparation method of highly dispersed graphene oxide quantum dots

A graphene quantum dot, highly dispersed technology, applied in the field of nanomaterials, can solve the problems of expensive raw materials, unfavorable mass production, high price, etc., and achieve the effects of green production process, strong monodispersity, and convenient operation.

Pending Publication Date: 2017-02-22
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the graphene quantum dots prepared by the etching method usually have a size larger than 20nm and are expensive and do not use mass production. Although the preparation of graphene quantum dots by hydrothermal or electrochemical methods is simple, the raw materials used are graphite, carbon nano tube, carbon fiber, fullerene, etc., the price of raw materials is relatively expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing highly dispersed graphene oxide quantum dots, wherein:

[0030] (1) Take coal powder and add it to the oxidizing acid solution, configure it according to the ratio of coal powder:oxidizing acid is 5g:90ml, and keep stirring at 100°C for 24h to obtain mixed solution A;

[0031] (2) The mixed solution prepared in step (1) was rotary evaporated at 60°C and -0.1MPa vacuum conditions to obtain a residual solid;

[0032] (3) Add deionized water to the residual solid prepared in step (2), configure according to the residual solid: deionized water ratio of 5g: 500ml, and mix evenly to obtain a mixed solution B;

[0033] (4) To the mixed solution prepared in step (3), adding an appropriate amount of activated carbon alkaline waste liquid with a pH of 10 for neutralization, until the pH of the solution reaches 7, to obtain a mixed solution C;

[0034] (5) The mixed solution prepared in step (4) is first filtered with a hollow fiber filter with a molecular ...

Embodiment 2

[0037] A kind of preparation method of highly dispersed graphene oxide quantum dots, same as implementation case 1, wherein:

[0038] The pulverized coal described in step (1) is bituminous coal, the oxidizing acid is nitric acid, the solution A is configured according to the ratio of pulverized coal: oxidizing acid is 10g: 150ml, and the stirring temperature is 100°C. Stirring time is 12h;

[0039] The temperature of the rotary evaporation described in step (2) is 60 DEG C;

[0040] The solution B in step (3) is configured according to the ratio of residual solids: deionized water of 10 g: 750 ml.

[0041] The activated carbon alkaline waste liquid pH value described in step (4) is 11;

[0042] The membrane of the hollow fiber filter described in step (5) is polyethersulfone membrane, and membrane area is 200cm 2 , the film length is 30cm, and the fiber inner diameter is 0.05mm;

[0043] The freeze-drying temperature described in step (6) is -80° C., and the vacuum degree...

Embodiment 3

[0045] A kind of preparation method of highly dispersed graphene oxide quantum dots, same as implementation case 1, wherein:

[0046] The pulverized coal described in the step (1) is coking coal, the oxidizing acid is concentrated sulfuric acid, the solution A is configured according to the ratio of pulverized coal: oxidizing acid is 15g: 250ml, and the stirring temperature is 150 ℃, the stirring time is 18h;

[0047] The temperature of the rotary evaporation described in step (2) is 80 DEG C;

[0048] The solution B in step (3) is configured according to the ratio of residual solids: deionized water of 15g: 1000ml.

[0049] The activated carbon alkaline waste liquid pH value described in step (4) is 12;

[0050] The membrane of the hollow fiber filter described in step (5) is polyethersulfone membrane, and membrane area is 300cm 2 , the film length is 50cm, and the inner diameter of the fiber is 0.5mm;

[0051] The freeze-drying temperature described in step (6) is -50° C...

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Abstract

The invention provides a preparation method of highly dispersed graphene oxide quantum dots. According to the technical scheme of the invention, one or more components, selected from coking coal, bituminous coal, brown coal, peat and anthracite, is / are adopted as raw materials. The raw materials are subjected to oxidation, separation and lyophilization to obtain light-yellow graphene oxide quantum dots. The preparation method is low in production cost, simple in process, green and environment-friendly. Obtained graphene oxide quantum dots are controllable in size, good in fluorescence effect, excellent in monodispersity and good in water solubility. The prepared highly dispersed graphene oxide quantum dots have a very large application prospect in the fields of photoelectric materials, device preparation, biological images, display screens, drug carriers, solar cells, anti-counterfeiting coatings, novel semiconductor devices and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a preparation method of highly dispersed graphene oxide quantum dots. Background technique [0002] In 2004, physicists at the University of Manchester successfully separated graphene from graphite. Because graphene has excellent electrical, thermal, mechanical and optical properties and has a wide range of applications in the field of nanotechnology, it has attracted widespread attention in the academic community. However, graphene is a semiconductor with zero energy bandgap, and graphene without energy bandgap cannot observe fluorescence properties, which limits its application in the field of electronics and optoelectronics, but the size of graphene is limited to below 10nm, and the use of quantum The opening of the energy band gap by the local effect and the edge effect will endow this small-sized graphene (that is, graphene quantum dots) with new physical p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198
CPCC01B2204/04C01B2204/32C01P2004/64
Inventor 李新禄张艳艳黄艳春粟泽龙赵昱颉赵奚誉王荣华
Owner CHONGQING UNIV
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