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Graphene oxide and graphene oxide quantum dot solvothermal controllable preparation method and use thereof

A technology of graphene quantum dots and graphene, which is applied in the field of nanomaterial preparation, can solve the problems of difficult control of shape and size, low production efficiency of graphene quantum dots, etc.

Inactive Publication Date: 2015-09-16
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the current cumbersome process of preparing graphene oxide, low preparation efficiency of graphene quantum dots, and difficult control of shape and size, the purpose of the present invention is to obtain graphene oxide or graphene oxide quantum dots by one-step solvothermal reaction and temperature control , Precisely control the size of graphene oxide quantum dots by changing graphite and potassium permanganate

Method used

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  • Graphene oxide and graphene oxide quantum dot solvothermal controllable preparation method and use thereof
  • Graphene oxide and graphene oxide quantum dot solvothermal controllable preparation method and use thereof
  • Graphene oxide and graphene oxide quantum dot solvothermal controllable preparation method and use thereof

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Embodiment 1

[0018] Put graphite powder and potassium permanganate with a mass ratio of 1:3 into a beaker, add sulfuric acid and nitric acid with a volume ratio of 3:1, and stir for 30 minutes; transfer all the above reactants to a 25mL polytetrafluoroethylene reactor reaction in an oven at 130°C for 1.5 hours; after the reaction is complete, disperse it in 50mL deionized water for use; take a certain amount and add it to a dialysis bag with a molecular weight cut-off of 3500Da, and dialyze for 3-7 days; put the dialysis bag The solution in is freeze-dried to obtain graphene oxide powder.

Embodiment 2

[0020] Put graphite powder and potassium permanganate with a mass ratio of 1:3 into a beaker, add sulfuric acid and nitric acid with a volume ratio of 3:1, and stir for 30 minutes; transfer all the above reactants to a 25mL polytetrafluoroethylene reactor , react in an oven at 160°C for 1.5 hours; after the reaction is complete, disperse it in 50mL of deionized water for use; take a certain amount and add it to a dialysis bag with a molecular weight cut-off of 1000Da, and dialyze for 3-7 days; put the dialysis bag The solution in is freeze-dried to obtain graphene oxide quantum dot powder.

Embodiment 3

[0022] Put graphite powder and potassium permanganate with a mass ratio of 4:3 into a beaker, add sulfuric acid and nitric acid with a volume ratio of 3:1, and stir for 30 minutes; transfer all the above reactants to a 25mL polytetrafluoroethylene reactor reaction in an oven at 160°C for 1.5 hours; after the reaction is complete, disperse it in 50 mL of deionized water for use; add the dispersed product to a dialysis bag with a molecular weight cut-off of 1000 Da, and dialyze for 3-7 days; The solution in the dialysis bag is freeze-dried to obtain graphene oxide quantum dot powder.

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Abstract

The invention belongs to the technical field of nano-material preparation and concretely relates to a graphene oxide and graphene oxide quantum dot solvothermal controllable preparation method and a use thereof. The preparation method comprises that common graphite as a raw material is added with a certain amount of sulfuric acid and potassium permanganate, the mixture is stirred for some time, the mixed solution is added with nitric acid, the suspending liquid is transferred into a Teflon reactor, the mixture undergoes a solvothermal reaction, the reaction product flavescent transparent liquid is dispersed in deionized water, a certain amount of the solution is subjected to dialysis until pH is 7 so that the graphene oxide or graphene oxide quantum dot aqueous solution is obtained in a dialysis bag, and the aqueous solution is subjected to freeze drying so that graphene oxide or graphene oxide quantum dot powder is obtained. In preparation, the graphene oxide or graphene oxide quantum dot can be produced only by control of a reaction temperature and graphene oxide quantum dots with different particle sizes can be obtained by change of a ratio of graphite to potassium permanganate. The preparation method utilizes one-step solvothermal method, has simple operation and after-treatment processes, and has a short period, a low cost, no toxicity and no pollution. The produced material can be widely used in fields of photoelectric devices, anti-counterfeiting, biomolecule fluorescence labeling and bioimaging.

Description

technical field [0001] The invention relates to nanomaterial preparation technology technical background [0002] Carbon is the most abundant element on earth, and it is distributed in various forms in the natural environment. Due to its wide range of sources and low cost, carbon-based materials have become a research hotspot as soon as they appeared. Discovered in 2004, graphene has excellent electrical properties, mechanical strength and thermal stability, and its discovery has had a great impact on science and technology. Graphene oxide is considered to be the precursor of graphene prepared by chemical and thermal reduction. Graphene oxide is usually prepared by reacting a strong oxidant with graphite. There are many oxygen-containing groups on its surface, which make it have some unique properties and water solubility, and have great potential application value. However, the general preparation method of graphene oxide has many steps and takes a long time, which is no...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 黄岭刘勃彤徐水林赵宝洲谢娟谢小吉黄维
Owner NANJING UNIV OF TECH
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