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Preparation method of fluorescent carbon quantum dot

A carbon quantum dot and fluorescence technology, which is applied in the field of preparation of fluorescent carbon quantum dots, can solve the problems of complex preparation process and narrow tunable range of emission wavelength of fluorescent carbon quantum dots, and achieves simple synthesis process, small change in luminous intensity, and high productivity. high efficiency and luminous efficiency

Inactive Publication Date: 2018-08-10
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing fluorescent carbon quantum dots, so as to solve the problem that the preparation process of the existing method is complicated, and the adjustable range of the fluorescent carbon quantum dots' emission wavelength is narrow.

Method used

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  • Preparation method of fluorescent carbon quantum dot
  • Preparation method of fluorescent carbon quantum dot
  • Preparation method of fluorescent carbon quantum dot

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Mix 25 mL of chromatographic grade absolute ethanol with a purity of 99.8% and 25 mL of ultrapure water in a 100 mL beaker, add 2 g of sorbose, heat and stir to dissolve the sorbose. Then the mouth of the beaker was sealed and further ultrasonically mixed for 20 min.

[0029] (2) Place the ultrasonically mixed solution in a 100mL brown polytetrafluoroethylene liner, seal it in a corresponding high-pressure reactor, and heat it in a high-temperature drying oven for hydrothermal reaction. The reaction temperature is 180°C, and the time is 4h.

[0030] (3) Filter the reaction solution after pyrolysis and carbonization through a 0.22um polytetrafluoroethylene filter, then place it in the dialysis bag of WM1000, and dialyze it in ultrapure water for 2 days to obtain an aqueous solution of carbon quantum dots.

[0031] (4) Vacuum drying the aqueous solution of carbon quantum dots to obtain target carbon quantum dots.

[0032] Characterization of the above-mentioned carb...

Embodiment 2

[0034] (1) Mix 17 mL of chromatographic grade absolute ethanol with a purity of 99.8% and 33 mL of ultrapure water in a 100 mL beaker, add 2 g of sorbose, heat and stir to dissolve the sorbose. Then the mouth of the beaker was sealed and further ultrasonically mixed for 20 min.

[0035] (2) Place the ultrasonically mixed solution in a 100mL brown polytetrafluoroethylene liner, seal it in a corresponding high-pressure reactor, and heat it in a high-temperature drying oven for hydrothermal reaction. The reaction temperature is 180°C, and the time is 4h.

[0036] (3) Filter the reaction solution after pyrolysis and carbonization through a 0.22um polytetrafluoroethylene filter, then place it in the dialysis bag of WM1000, and dialyze it in ultrapure water for 2 days to obtain an aqueous solution of carbon quantum dots.

[0037] (4) Vacuum drying the aqueous solution of carbon quantum dots to obtain target carbon quantum dots.

[0038] The related properties of the obtained carbo...

Embodiment 3

[0040] (1) Mix 12.5 mL of chromatographic grade absolute ethanol with a purity of 99.8% and 37.5 mL of ultrapure water into a 100 mL beaker, add 2 g of sorbose, heat and stir to dissolve the sorbose. Then the mouth of the beaker was sealed and further ultrasonically mixed for 20 min.

[0041] (2) Place the ultrasonically mixed solution in a 100mL brown polytetrafluoroethylene liner, seal it in a corresponding high-pressure reactor, and heat it in a high-temperature drying oven for hydrothermal reaction. The reaction temperature is 180°C, and the time is 4h.

[0042] (3) Filter the reaction solution after pyrolysis and carbonization through a 0.22um polytetrafluoroethylene filter, then place it in the dialysis bag of WM1000, and dialyze it in ultrapure water for 2 days to obtain an aqueous solution of carbon quantum dots.

[0043] (4) Vacuum drying the aqueous solution of carbon quantum dots to obtain target carbon quantum dots.

[0044] The related properties of the obtained...

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Abstract

The invention provides a preparation method of a fluorescent carbon quantum dot. The method comprises the following steps: a, taking sorbose as a carbon source, adding the sorbose into a mixed solution of ethanol and water, and fully carrying out mixing, wherein the ratio of the sorbose to the mixed solution of ethanol and water is (0.5-4g):50mL, and the volume ratio of the ethanol to the water is1:(1-3); b, putting the mixed liquor obtained in the step a into a reaction kettle, carrying out a hydrothermal reaction for 2-8 hours at a temperature of 170-200 DEG C, carrying out cooling to roomtemperature after the reaction is finished to obtain a reaction liquid; c, filtering the reaction liquid, and placing the filtered reaction liquid in a dialysis bag for dialysis for 1-3 days to obtaina water solution of the target carbon quantum dot; and d, carrying out vacuum drying on the water solution of the carbon quantum dot to obtain the target carbon quantum dot. According to the preparation method, the sorbose is taken as a carbon source, so that the preparation method has the advantages of simple synthesis process, easy control of conditions and the like, and the prepared carbon quantum dot has good fluorescence stability and wide adjustable range of light-emitting wavelength.

Description

technical field [0001] The invention relates to the field of nanomaterial science, in particular to a method for preparing fluorescent carbon quantum dots. Background technique [0002] Carbon quantum dots (CQD) are fluorescent carbon particle crystals with a size below 10nm and monodispersity. They are nano-sized particles with quantum size effects, small size effects, and surface effects. As a new type of semiconductor nanomaterial, compared with traditional inorganic semiconductor quantum dots, it has the advantages of strong photochemical stability, adjustable emission wavelength range, strong biocompatibility, and low cytotoxicity. , biosensing, and light-emitting devices have a wide range of applications. [0003] At present, there are many preparation methods of carbon quantum dots that people have studied. According to the different carbon sources, there are mainly the following two types: [0004] One is a preparation method using glucose, fructose, etc. as carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 李旭郑堃韦志仁陈铭鋆关丽滕枫
Owner HEBEI UNIVERSITY
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