Rapid preparation method of carbon quantum dots

A fast technology for carbon quantum dots, which is applied in the field of rapid preparation of carbon quantum dots, can solve the problems of low fluorescence quantum yield of carbon quantum dots, lengthy post-processing process, limitation of large-scale application, etc. The effect of mild conditions and simple equipment

Active Publication Date: 2018-04-20
烟台好前程文具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these methods have problems such as high energy consumption, harsh reaction conditions, and lengthy post-treatment process, and the fluorescence quantum yield of the obtained carbon quantum dots is low, which limits their large-scale application in various fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] A kind of fast preparation method of carbon quantum dot, it comprises the steps:

[0018] First, disperse the carbon source in a certain volume of solvent, and stir until the carbon source is completely dissolved and dispersed evenly. Secondly, a certain amount of alkali source is added into the solution in which the carbon source is dissolved, and ultrasonically treated at 300W for 2-5 hours to make it evenly mixed. Next, place the mixed solution mixed with carbon source and alkali source on a flat-plate heating furnace from room temperature at a rate of 5-25°C / min to rapidly heat up the solution until the solution boils and then continue heating. After a certain period of time, the solution turns into viscous or Turn off heating when solid, cool to room temperature. Finally, disperse the solid product in a certain volume of solvent at a mass ratio of 1:1000 and ultrasonically disperse it at 300W for 2 to 5 hours to make it evenly dispersed, then place the dispersion ...

Embodiment 1

[0024] First, disperse 1.5 g of soluble starch in 10 mL of deionized water, and stir until the starch is evenly dispersed. Next, 4.5g of ethylenediamine was added to the above mixture and ultrasonically treated at 300W for 2h to make it evenly mixed. Next, place the mixed solution of starch and ethylenediamine in a flat electric furnace and rapidly raise the temperature (the heating rate is about 20°C / min) until the liquid boils and then continue heating. After about 25 minutes, the white solution turns into a brown paste and stops. After heating and cooling to room temperature, a brown solid was obtained. Finally, disperse 0.5 g of the brown solid in 500 mL of deionized water and ultrasonically treat it at 300 W for 2 h to make it evenly dispersed, then place the dispersion in a high-speed centrifuge and centrifuge at a speed of 12,000 r / min, and the supernatant contains particles. A solution of carbon quantum dots with a diameter of about 3nm.

[0025] Fluorescence spectro...

Embodiment 2

[0027] First, disperse 2 g of citric acid in 12 mL of deionized water, and stir until the citric acid is completely dissolved and dispersed evenly. Next, 8g of triethylamine was added to the above mixture and ultrasonically treated at 300W for 3h to make it evenly mixed. Next, place the mixed solution of citric acid and ethylenediamine on a flat electric furnace and rapidly raise the temperature (heating rate is about 5°C / min) until the liquid boils and then continue heating. After about 1 hour, the colorless solution turns into a dark brown paste. Heating was stopped when the solid was formed, and a dark brown solid was obtained after cooling to room temperature. Finally, disperse 0.2g of the dark brown solid in 200mL of deionized water, and ultrasonically treat it at 300W for 3 hours to make it evenly dispersed, then place the dispersion in a high-speed centrifuge and centrifuge at a speed of 12000r / min, and the supernatant contains A solution of carbon quantum dots with a ...

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Abstract

The invention provides a rapid preparation method of carbon quantum dots. The rapid preparation method comprises the following steps: dispersing a carbon source into a solvent; stirring until the carbon source is dissolved; then adding an alkaline source, and carrying out ultrasonic treatment to uniformly mix the alkali source; after heating to boil a solution, continuously heating until the solution is transformed into a sticky matter or a solid matter; then stopping heating and cooling to room temperature to obtain a solid product; dispersing the solid product into a solvent according to a mass ratio of 1 : (100 to 1000) and carrying out the ultrasonic treatment to uniformly disperse the solid product; then putting a solution in a high-speed centrifugal machine and centrifuging to obtainsupernatant, namely a solution containing the carbon quantum dots. Compared with a traditional method for preparing the carbon quantum dots, the rapid preparation method provided by the invention hasthe characteristics of simple operation method, short reaction time, moderate needed conditions and the like, and the aim of rapidly producing the high-quality carbon quantum dots in a large scale can be realized under a low energy consumption condition. The carbon quantum dots prepared by the rapid preparation method have a uniform size and the yield of fluorescent quanta is high. The method provided by the invention is suitable for large-scale industrial production of the high-quality carbon quantum dots.

Description

technical field [0001] The invention relates to a rapid preparation method of carbon quantum dots, which belongs to the technical field of fluorescent nanometer material preparation. Background technique [0002] Quantum dots are spherical nanoparticles with a size of less than 10nm. They are usually extracted from mixtures containing lead, cadmium or silicon, but these materials are generally toxic and harmful to the environment. As a new class of fluorescent nanomaterials, carbon quantum dots (CDs), similar to various semiconductor quantum dots, can emit bright light under illumination. However, compared with semiconductor quantum dots, carbon quantum dots have the characteristics of non-toxicity, good biocompatibility, good stability, good fluorescence tunability, easy functionalization and higher photobleaching resistance, so they are widely used in cell imaging. , biosensing, drug carriers, ion detection, and optoelectronic devices have received special attention from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 刘超董雨菲姚建辉刘锐张赫林阳
Owner 烟台好前程文具有限公司
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