Method for preparing fluorescent carbon quantum dots

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 expensive raw materials, low fluorescence quantum yield of products, complicated operations, etc., and achieves the effects of low cost, simple preparation method and QY improvement.

Inactive Publication Date: 2018-01-26
NANKAI UNIV
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  • Abstract
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Problems solved by technology

[0003] Most current methods for synthesizing CQDs have certain limitations or defects, such as expensive raw materials, complicated operations, and low fluorescence quantum yield (QY) of products, etc.

Method used

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  • Method for preparing fluorescent carbon quantum dots

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preparation example Construction

[0025] Such as figure 1 Shown, the preparation method of the fluorescent carbon quantum dot of one embodiment, comprises the steps:

[0026] Step S110: Mix citric acid, glutathione and water to form a mixed solution.

[0027] In a preferred embodiment of the present invention, the present invention mixes citric acid and glutathione and dissolves them in pure water, and then stirs them to disperse them evenly to form a mixed solution.

[0028] Further, the mass ratio of citric acid, glutathione and pure water is 10:1:200.

[0029] Step S120: distilling the mixed solution to obtain a distillate;

[0030] In some preferred embodiments, in the step of distilling the mixed solution of the present invention, the way of distillation is microwave distillation.

[0031] Specifically, put the mixed solution of citric acid and glutathione into an Erlenmeyer flask, and connect the Erlenmeyer flask to a condenser tube, then put it into a microwave oven for heating, and carry out microwa...

Embodiment 1

[0041] Pour 20ml of ultrapure water into the beaker, then add 1g of citric acid (C6H8O7, analytically pure) and 0.1g of glutathione (C10H17N3O6S, analytically pure), stir well to make it evenly dispersed;

[0042] Put the prepared mixed solution of citric acid and glutathione into the Erlenmeyer flask, connect it to the condenser tube, put it into a household microwave oven, and heat it for 10 minutes. After the heating is completed, wait for the mixed solution to cool to room temperature to obtain liquid;

[0043] Put the distillate in an oil bath at 200°C, take it out after heating for 10 minutes, and obtain a solution containing fluorescent N / S-CQDs;

[0044] Put the obtained fluorescent N / S-CQDs into a 2000D dialysis bag and dialyze once every 2h for a total of 4 times to obtain the desired fluorescent N / S-CQDs with a QY of 76.5%.

Embodiment 2

[0046] Based on the supplemented information, I will make supplements.

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Abstract

The invention provides a method for preparing fluorescent carbon quantum dots. The method comprises the following steps: distilling a mixed solution formed by citric acid, glutathione and water at XXto X DEG C to obtain a distillate, carrying out a heat insulation reaction on the distillate at XX to XX DEG C to obtain a solution containing fluorescent N / S-CQDs, and dialyzing the fluorescent N / S-CQDs solution to obtain the fluorescent carbon quantum dots. The method for preparing the fluorescent carbon quantum dots has the advantages of simplicity, low cost, and easiness in operation; and thesynthesized N / S-CQDs have greatly improved QY, and have very strong photo-bleaching resistance, and the pH and the salinity have small influences on the fluorescence intensity of the N / S-CQDs, so thepreparation method is of great significance to the application of the fluorescent N / S-CQDs in an actual environment.

Description

technical field [0001] The invention relates to the technical field of biological detection, in particular to a preparation method of fluorescent carbon quantum dots. Background technique [0002] CQDs, also known as carbon nanocrystals and carbon nanodots, are fluorescent nanomaterials with approximately spherical shapes, and their particle sizes are about 1-100nm. CQDs have many excellent optical properties, and some CQDs have fluorescence upconversion properties, and can use near-infrared light as a light source, which is convenient for the study of fluorescence in vivo imaging. The photobleaching resistance of fluorescent CQDs is also better than that of traditional organic fluorescent dyes, making them of high application value in the fields of biolabeling and imaging. [0003] Most of the current methods for synthesizing CQDs have certain limitations or defects, such as expensive raw materials, complicated operation, and low fluorescence quantum yield (QY) of the prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y30/00
Inventor 刘伟伟周朗峰张磊乔蒙孙陆林列陈平
Owner NANKAI UNIV
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