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Fluorescent carbon dot capable of realizing visible light excitation and long wavelength emitting, and preparation method and application thereof

A technology of fluorescent carbon dots and visible light, applied in fluorescence/phosphorescence, material excitation analysis, chemical instruments and methods, etc., can solve the problems of low carbon dots in fluorescence quantum yield, short emission wavelength, background fluorescence penetration, etc., to achieve The synthesis method is simple and effective, the reaction conditions are mild and controllable, and the raw materials are easy to obtain

Inactive Publication Date: 2020-05-01
LIAONING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although there have been many literature reports on the preparation method and application research of fluorescent carbon dots, the existing preparation methods still have low fluorescence quantum yield, most of the obtained carbon dots need to be excited by ultraviolet light, and the emission wavelength is short, so that It is prone to problems such as background fluorescence and poor penetration in biomedical applications, which limit its application

Method used

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  • Fluorescent carbon dot capable of realizing visible light excitation and long wavelength emitting, and preparation method and application thereof
  • Fluorescent carbon dot capable of realizing visible light excitation and long wavelength emitting, and preparation method and application thereof
  • Fluorescent carbon dot capable of realizing visible light excitation and long wavelength emitting, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation method

[0031] At room temperature, add 100mg of quercetin and 400mg of glycine to 10mL of absolute ethanol, then put the resulting mixture into a reaction kettle lined with polytetrafluoroethylene, heat at 180°C for 7 hours, and cool to room temperature naturally Finally, add 1.5g PEI600, then put it back into the reaction kettle, heat at 160°C for 12 hours, naturally cool to room temperature, filter, centrifuge, and dialyze the supernatant to obtain fluorescent carbon dots, which are recorded as fluorescent carbon dots-1 .

[0032] The fluorescent carbon dot solution prepared in this example uses rhodamine B as a standard substance, and the measured fluorescence quantum yield is 32%.

[0033] The excitation wavelength is 470nm and the emission wavelength is 552nm.

[0034] (2) Results

[0035] 1, figure 1 Transmission electron micrographs of fluorescent carbon dots prepared for this example. Depend on figure 1 It can be found that the prepared f...

Embodiment 2

[0042] At room temperature, add 100mg of quercetin and 400mg of glycine to 10mL of absolute ethanol, then put the resulting mixture into a reaction kettle lined with polytetrafluoroethylene, heat at 180°C for 7 hours, and cool to room temperature naturally , add 1.5g of urea, then put it back into the reaction kettle, heat at 160°C for 12h, cool to room temperature naturally, filter, centrifuge, and dialyze the supernatant to obtain fluorescent carbon dots, which are recorded as fluorescent carbon dots-2.

[0043] The fluorescent carbon dot solution prepared in this example uses rhodamine B as a standard substance, and the measured fluorescence quantum yield is <6%.

[0044] The optimal excitation wavelength is 470nm and the emission wavelength is 560nm.

[0045] It can be seen that by adding urea as a passivating agent, the maximum excitation and emission wavelength of the obtained carbon dots is not much different from that of fluorescent carbon dots-1, but the fluorescence ...

Embodiment 3

[0047] At room temperature, add 100mg of quercetin and 400mg of glycine to 10mL of absolute ethanol, then put the resulting mixture into a reaction kettle lined with polytetrafluoroethylene, heat at 180°C for 7 hours, and cool to room temperature naturally Finally, add 1.5g of PEG, then put it back into the reaction kettle, heat at 160°C for 12h, naturally cool to room temperature, filter, centrifuge, and finally dialyze the supernatant to obtain fluorescent carbon dots, which are recorded as fluorescent carbon dots-3 .

[0048] The fluorescent carbon dot solution prepared in this example uses rhodamine B as a standard substance, and the measured fluorescence quantum yield is 23%.

[0049] The optimum excitation wavelength is 370nm and the emission wavelength is 458nm. Compared with fluorescent carbon dot-1, both excitation and emission wavelengths are blue-shifted, so fluorescent carbon dot-1 has excellent fluorescence performance.

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Abstract

The invention relates to a fluorescent carbon dot capable of realizing visible light excitation and long wavelength emitting, and a preparation method and application thereof. According to a technicalscheme in the invention, the method comprises the following steps of: putting quercetin and glycine in an ethanol system into a stainless steel reaction kettle lined with polytetrafluoroethylene at room temperature, carrying out heating at 180 DEG C for 7 hours, performing natural cooling to room temperature, adding a passivating agent, conducting heating at 160 DEG C for 12 hours, performing natural cooling to room temperature, and successively conducting filtering, centrifuging and dialyzing to obtain the fluorescent carbon dot. A solvothermal method is adopted, the fluorescent carbon dot is synthesized in one step, and the fluorescence property of the fluorescent carbon dot is enhanced through modification. The raw materials for preparing the carbon dot are easy to obtain, the method is simple, synthesis conditions are mild and controllable, and the obtained fluorescent carbon dot has the advantages of visible light excitation, long emission wavelength, good stability and high fluorescence quantum yield.

Description

technical field [0001] The invention relates to the technical field of carbon nanomaterials, in particular to a fluorescent carbon dot excited by visible light and emitted by long wavelengths. Background technique [0002] Carbon dots (CDs) are a new type of carbon nanoparticles with a diameter less than 10nm that have emerged in recent years. Fluorescence is the most prominent performance of carbon dots. Carbon dots have excellent fluorescence properties such as stable fluorescence, resistance to photobleaching, and no light flickering phenomenon. In addition, fluorescent carbon dots have good biocompatibility and low toxicity. They are very good fluorescent labeling and imaging materials, and have been successfully applied in cell and in vivo imaging. Fluorescent carbon dots have shown broad application prospects in the fields of cell imaging, analysis and detection, and photocatalysis. [0003] Although there have been many literature reports on the preparation method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00C01B32/15C02F1/72G01N21/64C02F1/30C02F101/30
CPCC09K11/65B82Y20/00B82Y40/00C01B32/15C02F1/725C02F1/30G01N21/6428C02F2101/308G01N2021/6497
Inventor 郭兴家王祚伟郝爱军刘清士
Owner LIAONING UNIVERSITY
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