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Method for preparing carbon quantum dots

A carbon quantum dot and quality technology, applied in the field of quantum dot preparation, can solve the problems of difficulty in obtaining raw materials, low fluorescence quantum yield of carbon quantum dots, and inability to large-scale production, and achieves the effect of simple process operation.

Inactive Publication Date: 2011-09-14
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention proposes a method for preparing carbon quantum dots in order to solve the problem that the existing carbon quantum dot preparation method cannot be mass-produced due to the difficulty in obtaining raw materials and the fluorescence quantum yield of carbon quantum dots is less.

Method used

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  • Method for preparing carbon quantum dots
  • Method for preparing carbon quantum dots
  • Method for preparing carbon quantum dots

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: a kind of preparation method of carbon quantum dot comprises the following steps: m =500 g dry poplar sawdust was heated in a tube-type electric heating furnace, the reaction temperature was 350 °C, and the volume of air introduced into the tube-type electric heating furnace per minute was V =250 L of air, making V : m =0.5, the flue gas generated by the reaction is introduced into the water tank through the flue gas outlet pipe to obtain soot; the soot obtained above is added to 2.5 mol / L nitric acid solution for reflux acid cooking, and the reaction time is 10 hours. After the reaction, the pH value of the solution was adjusted to 6~8, and then the solid product was obtained after removing water; the solid product obtained after removing the water was mixed with polyethylene glycol with a molecular weight of 200 in deionized water at a mass ratio of 3:2 and placed in a constant temperature box, the reaction temperature was maintained at 105 ° C, the re...

Embodiment 2

[0022] Embodiment 2: a kind of preparation method of carbon quantum dot comprises the following steps: m =600 g of dry pagoda tree sawdust was heated in a tubular electric heating furnace, the reaction temperature was 450 °C, and the volume of the air introduced into the tubular electric heating furnace per minute was V =3600 L of air, making V : m =6, the flue gas generated by the reaction is introduced into the water tank through the flue gas outlet pipe to obtain soot; the soot obtained above is added to 3.6 mol / L nitric acid solution for reflux acid cooking, the reaction time is 12 hours, and the After the reaction, the pH value of the solution was adjusted to 6~8, and then the solid product was obtained after removing water; the solid product obtained after removing the water was mixed with polyethylene glycol with a molecular weight of 3000 in deionized water at a mass ratio of 3:1 and placed in a constant temperature box, the reaction temperature was maintained at 135...

Embodiment 3

[0023] Embodiment 3: a kind of preparation method of carbon quantum dot comprises the following steps: m = 650 g of dried cotton stalks were put into a tubular electric heating furnace for heating, and the reaction temperature was 400 °C. V =1950 L of air, making V : m =3, the flue gas generated by the reaction is introduced into the water tank through the flue gas outlet pipe to obtain soot; the soot obtained above is added to 3 mol / L nitric acid solution for reflux acid cooking, and the reaction time is 11 hours. After the reaction, the pH value of the solution was adjusted to 6~8, and then the solid product was obtained after removing water; the solid product obtained after removing the water was mixed with polyethylene glycol with a molecular weight of 1500 in deionized water at a mass ratio of 3:1.5 and placed in a constant temperature box, the reaction temperature was maintained at 120 ° C, the reaction time was 60 hours, and then centrifuged at a centrifugal rate of 5...

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Abstract

The invention relates to the technical field of quantum dot preparation, in particular to a method for preparing carbon quantum dots, and solves the problems that mass production cannot be realized because raw materials are difficult to obtain, and the fluorescence quantum yield of the obtained carbon quantum dots is low in the conventional method for preparing the carbon quantum dots. The method for preparing the carbon quantum dots comprises the following steps of: heating dried plant stalks in a tubular electric heating furnace, introducing air through an air lead-in pipe of the tubular electric heating furnace, and leading flue gas generated by reaction in a water tank through a flue gas lead-out pipe to obtain soot; adding the obtained soot into nitric acid solution for refluxing and acid boiling, regulating the pH value of reaction solution to be between 6 and 8, and removing water to obtain a solid product; and mixing the solid product and polyethylene glycol in a mass ratio of 3:(2-1) in deionized water, and centrifuging to obtain the carbon quantum dots. The process is easy to operate and can be widely applied to the fields of biological detection, sensing, photoelectric conversion, catalysis, optical amplitude limiting and the like.

Description

technical field [0001] The invention relates to the technical field of quantum dot preparation, in particular to a method for preparing carbon quantum dots. Background technique [0002] Carbon quantum dots are another new type of carbon nanomaterials after fullerenes, carbon nanotubes and graphene. They are spherical fluorescent carbon nanoparticles with a size generally less than 10 nm and good dispersion. Quantum dots (such as CdS, CdSe and their core-shell structures) have comparable fluorescence quantum yields, and have many advantages such as non-toxicity (or low toxicity), good biocompatibility and easy surface functionalization, so in biological detection , sensing, imaging and many other fields have important applications; carbon quantum dots can also be used as electron donors or acceptors to generate photoinduced electron transfer, so that they can be used as additive components in organic semiconductor materials to make high-efficiency photoelectric conversion de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y40/00
Inventor 胡胜亮曹士锐杨金龙董英鸽刘炜王延忠
Owner ZHONGBEI UNIV
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