Boron-nitrogen co-doped carbon quantum dot as well as preparation and application thereof

A technology of carbon quantum dots and co-doping, which is applied in the direction of measuring devices, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problems of short emission wavelength and low fluorescence quantum yield, and achieve reaction Short time, excellent fluorescence characteristics, and good experimental repeatability

Active Publication Date: 2020-04-10
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of short emission wavelength and low fluorescence quantum yield of existing carbon quantum dots, and provide a boron-nitrogen co-doped carbon quantum dot

Method used

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  • Boron-nitrogen co-doped carbon quantum dot as well as preparation and application thereof
  • Boron-nitrogen co-doped carbon quantum dot as well as preparation and application thereof
  • Boron-nitrogen co-doped carbon quantum dot as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 0.27g (2.5mmol) of o-phenylenediamine and 0.15g (2.4mmol) of boric acid, add them into 10mL of ultrapure water, stir at room temperature until completely dissolved, and obtain a precursor solution.

[0036] The precursor solution was sealed in a glass tube for a microwave synthesizer, heated to 200° C. in a microwave with a working pressure of 30 bar, and cooled to room temperature after a hydrothermal reaction for 10 minutes to prepare a brown solution.

[0037] Filter the above brown solution with a 0.22 μm microporous membrane to remove large particles of impurities to obtain a light brown solution. Then put the solution in a dialysis bag with a molecular weight cut-off of 1000Da and dialyze for not less than 48 hours to remove unreacted or by-product small molecules to obtain a purified solution. During this period, the water was changed every 12 hours.

[0038] The purified solution in the dialysis bag is collected and dried to obtain a boron-nitrogen co-dop...

Embodiment 2

[0051] Weigh 0.27g (2.5mmol) of o-phenylenediamine and 0.15g (2.4mmol) of boric acid, add them into 10mL of ultrapure water, stir at room temperature until completely dissolved, and obtain a precursor solution.

[0052] The precursor solution was sealed in a glass tube for a microwave synthesizer, heated to 220° C. in a microwave with a working pressure of 30 bar, and cooled to room temperature after a hydrothermal reaction for 40 minutes to prepare a brown solution.

[0053] Filter the above brown solution with a 0.22 μm microporous membrane to remove large particles of impurities to obtain a light brown solution. Then put the solution in a dialysis bag with a molecular weight cut-off of 1000Da and dialyze for not less than 48 hours to remove unreacted or by-product small molecules to obtain a purified solution. During this period, the water was changed every 12 hours.

[0054] The purified solution in the dialysis bag is collected and dried to obtain a boron-nitrogen co-dop...

Embodiment 3

[0056] Weigh 0.27g (2.5mmol) of o-phenylenediamine and 0.23g (3.75mmol) of boric acid, add them into 10mL of ultrapure water, stir at room temperature until completely dissolved, and obtain a precursor solution.

[0057] The precursor solution was sealed in a glass tube for a microwave synthesizer, heated to 180° C. in a microwave with a working pressure of 30 bar, and cooled to room temperature after a hydrothermal reaction for 10 minutes to prepare a brown solution.

[0058] Filter the above brown solution with a 0.22 μm microporous membrane to remove large particles of impurities to obtain a light brown solution. Then put the solution in a dialysis bag with a molecular weight cut-off of 1000Da and dialyze for not less than 48 hours to remove unreacted or by-product small molecules to obtain a purified solution. During this period, the water was changed every 12 hours.

[0059] The purified solution in the dialysis bag is collected and dried to obtain a boron-nitrogen co-do...

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Abstract

The invention relates to a boron-nitrogen co-doped carbon quantum dot which is prepared by taking o-phenylenediamine as a carbon source and a nitrogen source, boric acid as a boron source doping agent, through microwave-assisted hydrothermal reaction in water and reaction product purification. The boron-nitrogen co-doped carbon quantum dot prepared by the invention has a particle size of less than10nm, can emit yellow fluorescence with a long wavelength of 560nm under excitation, has high fluorescence quantum yield, has excitation independence, low toxicity and good biocompatibility, and canbe used as a fluorescent probe in cell imaging.

Description

technical field [0001] The invention belongs to the technical field of carbon quantum dot preparation, and relates to a carbon quantum dot based on boron and nitrogen co-doping, a preparation method of the carbon quantum dot, and an application of the carbon quantum dot in cell imaging. Background technique [0002] Carbon quantum dots are carbon nanoparticles with excellent photoluminescent properties. Its shape is similar to spherical monodisperse fluorescent carbonaceous nanomaterials, and the particle size is generally less than 10nm. Carbon quantum dots not only have the advantages of adjustable emission wavelength and photobleaching resistance of traditional semiconductor quantum dots, but also have the advantages of low toxicity, good biocompatibility, good water solubility, wide source of raw materials, and easy functional modification. Labeling and drug delivery have good application prospects and development potential. [0003] However, the carbon quantum dots cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65G01N21/64B82Y20/00B82Y30/00
CPCC09K11/65B82Y20/00B82Y30/00G01N21/6428G01N21/6456
Inventor 陈琳卫迎迎王军丽杜晶磊李强刘旭光杨永珍于世平
Owner TAIYUAN UNIV OF TECH
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