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Wavelength adjustable carbon quantum dots, preparation method and applications thereof

A technology of carbon quantum dots and wavelengths, applied in the field of carbon quantum dots and its preparation, can solve problems such as the inability to realize four-color marking, and achieve the effects of cost reduction, low toxicity, and convenient operation

Active Publication Date: 2016-01-13
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the reported carbon dots can achieve multi-color labeling by changing the excitation wavelength, but they have not been able to achieve blue, green, yellow and red four-color labeling under single wavelength excitation.

Method used

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  • Wavelength adjustable carbon quantum dots, preparation method and applications thereof
  • Wavelength adjustable carbon quantum dots, preparation method and applications thereof
  • Wavelength adjustable carbon quantum dots, preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Preparation of mixed solutions containing various fluorescent carbon dots

[0027] First measure 5 ml of ethanol into a 50 ml centrifuge tube, then weigh 0.2 g of urea and 0.2 g of unoxidized p-phenylenediamine into the centrifuge tube quickly, shake until completely dissolved, and form a reddish-brown solution . Then add 45 ml of deionized water, mix evenly, transfer the mixture into an autoclave (150 ml), and seal it for storage. After preheating the high temperature oven to 160 degrees Celsius, put the reaction kettle into the oven for 10 hours. After the reaction is completed, turn off the oven, open the ovens, and cool to room temperature naturally;

[0028] (2) Purification of mixed solutions containing various fluorescent carbon dots

[0029]Rotate the mixture obtained in step (1) (water bath, 65 degrees Celsius) until 3-5 ml of liquid remain, add 6-8 grams of silica gel (100-200 mesh), stir evenly, rotate again to dryness, and save . At the same time, us...

Embodiment 2

[0032] The preparation method is the same as in Example 1, but the reaction temperature is changed to 180 ° C, and other conditions remain unchanged. The emission wavelengths of the four finally obtained fluorescent carbon dots are 434, 512, 564, and 609 nanometers. The quantum yields are: 33, 12, 18, 6%, respectively.

Embodiment 3

[0034] The preparation method is the same as in Example 1, but the reaction temperature is changed to 140 degrees Celsius, and other conditions remain unchanged. The emission wavelengths of the four fluorescent carbon dots finally obtained are 452, 525, 571, and 630 nanometers. The quantum yields are: 11, 8, 5, and 2%, respectively. From the results, temperature has a significant effect on both the emission wavelength and quantum yield, especially the quantum yield, which may be because temperature plays a key role in the formation of carbon dots.

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Abstract

The present invention belongs to the technical field of nanometer materials, and particularly relates to wavelength adjustable carbon quantum dots, a preparation method and applications thereof. According to the present invention, the one-pot method (reaction kettle) is used to synthesize, the method has characteristics of simpleness, green environmental protection and low raw material prices, the reaction temperature is 140-200 DEG C, and the great industrial production prospects are provided; according to the synthesized carbon quantum dots, the inner core has a graphitized crystal lattice structure, the outer shell is a layer of amorphous carbon and contains a lot of hydrophilic functional groups, and the carbon quantum dots has good solubility and good stability in a polar solvent, and has diameter distribution of 1.5-4 nm; the fluorescence redshift of the carbon quantum dots is generated by the change of the surface functional groups; and the wavelength adjustable carbon quantum dots adopted as the novel light-emitting material has characteristics of low production cost, low biological toxicity, high light emitting efficiency, good stability, and good application prospects in optoelectronic devices and biotechnology.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a carbon quantum dot and its preparation method and application. Background technique [0002] In recent years, fluorescent semiconductor quantum dots such as CdSe, ZnS, and CdSe-related core-shell nanoparticles have attracted widespread interest due to their unique optical properties and huge biomedical application prospects. Its luminescent mechanism is due to the transition of excitons between the valence and conduction bands. Semiconductor quantum dots have been used many times in fluorescence imaging experiments, and have been successfully applied in tumor vasculature, tumor-specific diaphragm antigens, and labeled lymph nodes. However, such quantum dots all contain heavy metal Cd, which is quite toxic even when used in extremely low concentrations, thus bringing huge health and environmental hazards to humans, thus limiting the application prospects...

Claims

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Application Information

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IPC IPC(8): C01B31/02C09K11/65
Inventor 熊焕明丁辉
Owner FUDAN UNIV
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