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A kind of carbon quantum dot and its preparation method and application

A technology of carbon quantum dots and ions, applied in the field of carbon quantum dots and their preparation, can solve the problems of poor structural stability of carbon quantum dots, cumbersome pretreatment, low quantum efficiency, etc., and achieves high sensitivity, increased quantum efficiency, and convenient operation. Effect

Active Publication Date: 2021-04-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In particular, more research is needed to explain the luminescence of carbon quantum dots with different structures, and the carbon quantum dots prepared by passivation such as ammonia water and ethylenediamine have the problem of agglomeration leading to weakened fluorescence due to the small passivation groups on the surface. Possibility, carbon quantum dots have poor structural stability and low quantum efficiency
[0003] There are many traditional iron ion analysis methods, such as atomic absorption spectrometry, inductive coupling, etc. These analysis methods usually require sophisticated and expensive instruments, and the pretreatment is cumbersome, which limits the practical application of this analysis method. The detection of Fe by dots has been reported, but this kind of research is limited to the detection of trace ferric ions by the fluorescence quenching of carbon quantum dots, and the detection of trace ferrous ions based on the fluorescence quenching method of carbon quantum dots has not been reported yet.

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  • A kind of carbon quantum dot and its preparation method and application
  • A kind of carbon quantum dot and its preparation method and application
  • A kind of carbon quantum dot and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) Preparation of carbon quantum dot solution: Weigh 5g of citric acid and 5g of tris(2-hydroxyethyl)amine, add them to the beaker stirred by the magnetic rotor at 300r / min speed, add 250ml of water and stir for 40min, then place Under ultrasonic dispersion (ultrasonic power is 20KHz, ultrasonic temperature is 30°C), after ultrasonic dispersion treatment for 30min, put the solution into the reaction kettle with nitrogen protection, react in the reaction furnace at 120°C for 4h, take out the solution and cool it for fluorescence test.

[0038] By transmission electron microscopy detection of the carbon quantum dots, as figure 1 As shown, the size range of carbon quantum dots is 1-10nm; figure 2 (a) and (b) are respectively the absorption and emission spectrograms of carbon quantum dots. It can be seen that the carbon quantum dots prepared by the present invention have the ability to absorb ultraviolet light at 200-400nm in the ultraviolet region and emit light at 400-7...

Embodiment 2

[0042](1) Preparation of carbon quantum dot solution: Weigh 5g of citric acid and 10g of tris(2-hydroxyethyl)amine, join in the beaker under the magnetic rotor stirring of 300r / min rotating speed, add water 250ml and stir for 40min, then place Under ultrasonic dispersion (ultrasonic power is 20KHz, ultrasonic temperature is 30°C), after ultrasonic dispersion treatment for 30min, put the solution into the reaction kettle with nitrogen protection, react in the reaction furnace at 120°C for 4h, take out the solution and cool it for fluorescence test.

[0043] (2) Application of carbon quantum dots in the detection of ferrous ions: take 10mL of carbon quantum dot solution and cooperate with 0.05g of glucose peroxidase (50U / g) to form a mixed solution, and add it dropwise to 20mL of ferrous ion solution (concentration of ferrous ions is 0.5umol / L, pH is 6), select 420nm as the optimal excitation wavelength of carbon quantum dots, there is no fluorescence quenching phenomenon; then d...

Embodiment 3

[0045] (1) Preparation of carbon quantum dot solution: Weigh 5g of citric acid and 15g of tris(2-hydroxyethyl)amine, join in the beaker under the magnetic rotor stirring of 300r / min rotating speed, add water 250ml and stir for 40min, then place Under ultrasonic dispersion (ultrasonic power is 20KHz, ultrasonic temperature is 30°C), after ultrasonic dispersion treatment for 30min, put the solution into the reaction kettle with nitrogen protection, react in the reaction furnace at 120°C for 4h, take out the solution and cool it for fluorescence test.

[0046] (2) Application of carbon quantum dots in the detection of ferrous ions: take 10mL of carbon quantum dot solution and cooperate with 0.025g of glucose peroxidase (50U / g) to form a mixed solution, and add it dropwise to 20mL of ferrous ion solution (concentration of ferrous ions is 0.5umol / L, pH is 6), select 420nm as the optimal excitation wavelength of carbon quantum dots, there is no fluorescence quenching phenomenon; then...

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Abstract

The invention discloses a carbon quantum dot and its preparation method and application, which are characterized in that: after mixing a carbon source and a nitrogen source, put it into deionized water and stir it fully; put the stirred mixed solution into an ultrasonic device Ultrasonic dispersion treatment; take the solution after ultrasonic dispersion, place it in a reactor under nitrogen protection for reaction, take out the solution and cool it, and obtain a carbon quantum dot solution; wherein, the carbon source is citric acid; the nitrogen source is three (2-hydroxyethyl)amine. The prepared carbon quantum dots complex with hydrogen peroxide to form a highly active oxidized ligand compound under the action of peroxidase, which can change the ferrous ion to trivalent, thereby quenching the fluorescence of carbon quantum dots, and can realize the The detection of iron ions lays a theoretical foundation for later applications.

Description

technical field [0001] The invention belongs to the technical field of functional nanometer powder preparation, and specifically designs a carbon quantum dot and its preparation method and application. Background technique [0002] Carbon quantum dots generally refer to a nano-carbon with a size less than 10nm, a quasi-spherical structure, and stable luminescence. It has the advantages of good water solubility, stable fluorescence performance, excellent biocompatibility, and easy functionalization. It has potential application value in ion detection, optical device preparation, biological imaging and tracking, photocatalyst and other fields. The emission of carbon quantum dots has high stability and no photobleaching, which overcomes the disadvantages of unstable luminescence and easy photobleaching of organic dyes. Carbon quantum dots are prepared based on the mechanism of organic synthesis, so the reaction scale can be controlled from the reaction conditions, so as to rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/65G01N21/643G01N2021/6432
Inventor 余媛葛明桥
Owner JIANGNAN UNIV