Preparation method of carbon quantum dots with adjustable fluorescence colors

Abstract

The present invention relates to a preparation method of carbon quantum dots with adjustable fluorescence colors, and belongs to the technical field of nanometer materials. According to method, citric acid or a citrate is adopted as a carbon source, a nitrogen-containing compound is adopted as a nitridation agent, hydrogen peroxide is adopted as an oxidant, a hydrothermal synthesis method is adopted to obtain an aqueous solution of carbon quantum dots emitting blue or green fluorescence under ultraviolet light excitation, reaction conditions are easily controlled, and the method is suitable for scale production. The prepared carbon quantum dots have advantages of adjustable fluorescence color, high yield, high quantum efficiency, good result reproducibility and the like, wherein the product can be directly used for tumor cell labeling and live cell imaging labeling. According to the present invention, only the one reactant is required, the raw materials are easily-available and non-toxic, the production process does not require special protection, the reaction condition is easily controlled, and the obtained carbon quantum dots have advantages of high yield, high quantum efficiency, good result reproducibility and the like; and the method has characteristics of high yield, simple preparation process, low cost, easy scale production and the like.

Description

technical field [0001] The invention relates to a preparation method of carbon quantum dots with adjustable fluorescent light and color, belonging to the technical field of nanometer materials. Background technique [0002] Quantum dot nanomaterials, especially semiconductor quantum dots, have broad application prospects in many fields, especially optoelectronic devices, biomarkers and biomedicine due to their excellent fluorescence properties. However, because heavy metal ions such as cadmium and lead are often used in the preparation process of semiconductor quantum dot materials, it has great biological toxicity and environmental hazards, which seriously limits its application in the field of biomedicine. In recent years, carbon quantum dots have shown great application potential in the fields of optical probes, biological image probes, light-emitting diodes, and visible light active catalysis. Carbon quantum dots have many excellent fluorescent properties, such as compo...

AI Technical Summary

Problems solved by technology

However, due to the influence of preparation methods and product quality, the wide application of carbon quantum dot materials has been greatly limited.

At present, the most commonly used methods for preparing carbon quantum dots include physical methods such as high-energy radiation and laser ablation, as well as soot oxidation, carbohydrate carbonization, polymer pyrolysis, electrochemistry, microwave-assisted pyrolysis, and chemical decomposition of carbon materials. There are disadvantages such as low yield, high cost or low quantum efficiency

In addition, in the existing reports, carbon quantum dot materials are mostly blue fluorescent, although blue fluorescent carbon quantum dot materials have very important applications in the fields of optoelectronic devices, biomarkers and biomedicine, but due to a The self-absorption and autofluorescence of some biological tissues are also concentrated in the blue wavelength region, thus limiting their application in some cases.

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