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Pulse potential preparation method for nitrogen-doped fluorescent carbon dots

A fluorescent carbon dot, nitrogen doping technology, applied in the field of carbon nanomaterials, can solve the problem of lack of new electrochemical methods

Active Publication Date: 2017-06-27
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, there is still a lack of new electrochemical methods for the preparation of fluorescent carbon dots with low potential, low cost, and simplicity.

Method used

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  • Pulse potential preparation method for nitrogen-doped fluorescent carbon dots
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  • Pulse potential preparation method for nitrogen-doped fluorescent carbon dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Use the CHI760E electrochemical workstation to control the potential, adopt a two-electrode system, the platinum plate is the working electrode and the counter electrode, and add a mixture of ethanol, o-phenylenediamine and water into a 200mL beaker as the electrolyte. The substances of these three reactants The volume ratio is 100:1:80. Set the parameters of the pulse potentiometric method and start the reaction: the high potential is 5V, the low potential is 3V, the pulse width is 5s, and the number of cycles is 720 times; after the reaction, the solution turns from colorless to yellow, and after standing for a while, take the supernatant Add hydrochloric acid to adjust the pH to be neutral, then centrifuge at 6000r / min for 5min, concentrate the supernatant by rotary evaporation, and finally use a dialysis bag with a cutoff of 3500 in deionized water to dialyze the concentrated solution for 48h to obtain nitrogen-doped fluorescent carbon point of aqueous solution.

Embodiment 2

[0021] The difference between Example 2 and Example 1 is that a mixture of ethanol, o-phenylenediamine and water is added in a 200mL beaker as the electrolyte, and the ratio of the amount of these three reactants is 90:1:70 . Set the parameters of the pulse potentiometric method and start the reaction: the high potential is 9V, the low potential is 5V, the pulse width is 5s, and the number of cycles is 720 times; after the reaction, the solution turns from colorless to yellow, and after standing for a while, take the supernatant Add hydrochloric acid to adjust the pH to be neutral, then centrifuge at 5000r / min for 10min, concentrate the supernatant by rotary evaporation, and finally use a dialysis bag with a cutoff of 1000 in deionized water to dialyze the concentrated solution for 48h to obtain nitrogen-doped fluorescent carbon point of aqueous solution.

Embodiment 3

[0023] The difference between embodiment 3 and embodiment 1 is that in the beaker of 200mL, add the mixed solution of citric acid, o-phenylenediamine and water as electrolyte, the ratio of the amount of these three reactants is 110:1: 80. Set the parameters of the pulse potentiometric method and start the reaction: the high potential is 9V, the low potential is 5V, the pulse width is 10s, and the number of cycles is 600 times; after the reaction, the solution changes from colorless to brownish-yellow. Add hydrochloric acid to the solution to adjust the pH to be neutral, then centrifuge at 6000r / min for 10min, concentrate the supernatant by rotary evaporation, and finally use a dialysis bag with a cutoff of 1000 in deionized water to dialyze the concentrated solution for 48 hours to obtain nitrogen-doped fluorescence Aqueous solution of carbon dots.

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Abstract

The invention discloses a pulse potential preparation method for nitrogen-doped fluorescent carbon dots. The pulse potential preparation method is characterized in that a combination of organic matter 1 and organic matter 2 is used as a carbon source, mixed liquid formed by ultrasonically configurating water and the combination is used as electrolyte, the organic matter 1 is one of ethanol, citric acid and ascorbic acid, the organic matter 2 is one of o-phenylenediamine, m-phenylenediamine and p-phenylenediamine, and the ratio of the amount of matter of the organic matter 1, the organic matter 2 and water is 200-50:1:120-20; a two-electrode system is adopted, a working electrode and a counter electrode both are platinum electrodes, the pulse potential method parameters are set, the electrolyte is carbonized for 1-4 hours, and a reaction solution is obtained; after the reaction solution stands still for a period of time, supernatant is taken, the pH of the supernatant is adjusted to be neutral, centrifugal treatment is conducted, rotation, evaporation and concentration are conducted, and a concentrated solution is obtained; and the concentrated solution is subjected to dialysis treatment in deionized water, and then an aqueous solution of the nitrogen-doped fluorescent carbon dots is obtained. The method is simple, the fluorescence yield of the obtained fluorescent carbon dots is high, the water solubility is good, and the stability is good.

Description

technical field [0001] The invention belongs to the technical field of carbon nanometer materials, and relates to a pulse potential preparation method of nitrogen-doped fluorescent carbon dots. Background technique [0002] Fluorescent carbon dots are a new type of carbon nanomaterials with photoluminescent properties similar to quantum dots. Since the synthesis and discovery of fluorescent carbon dots in 2004, due to its excellent luminescence, low toxicity, biocompatibility and low price, it has quickly become a star material in fluorescent materials. It can be used in chemical / biological sensing, biological imaging, photothermal diagnosis and treatment, luminescent materials for light-emitting devices, photocatalytic degradation of organic pollutants, photoelectric energy storage and other fields. It has great potential to replace toxic heavy metal quantum dots. The preparation methods of fluorescent carbon dots can be roughly divided into three methods: carbon nanodot p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C09K11/65
CPCC09K11/65C25B1/00
Inventor 苏招红宋东成魏茉丽赵艳周文新何佳兴蒋红梅
Owner HUNAN AGRICULTURAL UNIV
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