Nitrogen and sulfur co-doped carbon quantum dot as well as preparation method and application thereof

A technology of nitrogen-sulfur co-doping and carbon quantum dots, applied in chemical instruments and methods, measuring devices, nanotechnology for materials and surface science, etc., can solve complex sample preparation and processing processes, expensive large-scale instruments and equipment, Unable to achieve rapid detection and other problems, to achieve the effect of simple and easy-to-control preparation method, significant reproducibility and stability, and uniform size

Inactive Publication Date: 2021-12-10
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods are sensitive and reliable, there are also some shortcomings: (1) expensive large-scale equipment is required; (2) the sample preparation and processing process is relatively complicated; (3) the selectivity is poor; (4) rapid on-site detection cannot be realized Wait

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  • Nitrogen and sulfur co-doped carbon quantum dot as well as preparation method and application thereof
  • Nitrogen and sulfur co-doped carbon quantum dot as well as preparation method and application thereof
  • Nitrogen and sulfur co-doped carbon quantum dot as well as preparation method and application thereof

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preparation example Construction

[0044] A preparation method of nitrogen-sulfur co-doped carbon quantum dots, the method comprising the following steps:

[0045] (1) Ammonium citrate and sodium thiosulfate are added to water, and ultrasonically mixed to obtain a mixed solution; the mass ratio of ammonium citrate to sodium thiosulfate is (0.45-0.75):(0.30-0.50).

[0046] (2) Put the mixed solution in a reaction kettle, and react at a constant temperature; the temperature of the constant temperature reaction is 140-180° C., and the time is 4-6 hours.

[0047] (3) After the reaction is over, the reaction solution is naturally cooled to room temperature, and the reaction solution is poured into a dialysis bag for dialysis to obtain a pure aqueous solution of nitrogen-sulfur co-doped carbon quantum dots, which is then freeze-dried to obtain nitrogen-sulfur co-doped carbon quantum dots. Quantum dots, the size distribution of the carbon quantum dots is 1.5-5.0nm, and the surface is rich in -NH 2 , -OH and -SH funct...

Embodiment 1

[0053] A preparation method of nitrogen-sulfur co-doped carbon quantum dots, the method comprising the following steps:

[0054] (1) Dissolve 0.60 g of ammonium citrate and 0.40 g of sodium thiosulfate in 25 mL of deionized water, and ultrasonicate for 5 minutes to obtain a mixed solution;

[0055] (2) Place the mixed solution described in step (1) in a high-pressure reactor, and react at 160° C. for 5 hours;

[0056] (3) After the reaction in step (2) ends, the reaction solution is naturally cooled to room temperature, and the reaction solution is poured into a dialysis bag with a molecular weight cut-off of 100 Da, and dialyzed for 24 hours to obtain an aqueous solution of pure nitrogen-sulfur co-doped carbon quantum dots, Nitrogen-sulfur co-doped carbon quantum dots were obtained after freeze-drying.

[0057] Depend on figure 1 It can be seen that the nitrogen-sulfur co-doped carbon quantum dots have good dispersion and narrow size distribution, with an average size of ab...

Embodiment 2

[0059] A preparation method of nitrogen-sulfur co-doped carbon quantum dots, the method comprising the following steps:

[0060] (1) Dissolve 0.45g of ammonium citrate and 0.30g of sodium thiosulfate in 25mL of deionized water, and ultrasonicate for 5min to obtain a mixed solution;

[0061] (2) Place the mixed solution described in step (1) in a high-pressure reactor, and react at 180° C. for 4 hours;

[0062] (3) After the reaction in step (2) ends, the reaction solution is naturally cooled to room temperature, and the reaction solution is poured into a dialysis bag with a molecular weight cut-off of 100 Da, and dialyzed for 24 hours to obtain an aqueous solution of pure nitrogen-sulfur co-doped carbon quantum dots, Nitrogen-sulfur co-doped carbon quantum dots were obtained after freeze-drying.

[0063] The nitrogen-sulfur co-doped carbon quantum dots have a size distribution of 1.5-5.0nm and abundant -NH on the surface 2 , -OH, -SH and other functional groups, the maximum ...

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Abstract

The invention relates to a nitrogen-sulfur co-doped carbon quantum dot as well as a preparation method and an application thereof, and the quantum dot is synthesized by taking ammonium citrate and sodium thiosulfate as raw materials through a one-step hydrothermal method. The average size of the nitrogen-sulfur co-doped carbon quantum dot is about 3.3 nm, the nitrogen-sulfur co-doped carbon quantum dot has good water solubility and optical stability, the maximum excitation wavelength is 343 nm, and the maximum emission wavelength is 435 nm. The nitrogen-sulfur co-doped carbon quantum dot prepared by the invention has relatively high fluorescence quantum yield, can be used as a fluorescence probe for detecting silver ions, and has the advantages of good selectivity, high sensitivity, low detection limit, strong anti-interference capability and the like. The preparation method of the quantum dot is simple and is low in cost, can be put into industrial production, and has a wide application prospect in the aspect of biological and environmental sample detection.

Description

technical field [0001] The invention relates to the technical field of metal ion detection, in particular to a nitrogen-sulfur co-doped carbon quantum dot and its preparation method and application. Background technique [0002] In recent years, pollution caused by various heavy metal ions has become a major worldwide problem threatening human health and ecosystems. Silver (Ag), as a precious metal, is widely used in daily life such as electronics, photography, and pharmaceuticals, and is of great significance to human beings. As a result, large amounts of silver are released into the environment from industrial waste every year. [0003] In addition, the antibacterial properties of nano silver make it widely used in the medical field. However, many studies have reported that Ag + It has a strong affinity for amino and sulfhydryl groups, and can combine with amino acids, nucleic acids and other substances in the human body to form harmful complexes, causing serious harm t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00B82Y40/00G01N21/64
CPCC09K11/65B82Y20/00B82Y30/00B82Y40/00G01N21/643
Inventor 董文雅
Owner SHANGHAI INST OF TECH
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