Method for synthesizing fluorescent carbon dots by taking tea leaves as carbon source through one-step method and application of fluorescent carbon dots

Abstract

The invention discloses a method for one-step synthesis of fluorescent carbon dots with tea leaves as a carbon source and application of the fluorescent carbon dots, and relates to the technical field of carbon dot synthesis, the technical key point is that the method specifically comprises the following steps: S1, carbon source pretreatment: Tieguanyin tea residues and green tea residues are cleaned, dried and prepared into powder; s2, carbon dot synthesis: weighing 0.3000 g of Tieguanyin tea residue powder and 0.3000 g of green tea residue powder, respectively pouring the Tieguanyin tea residue powder and the green tea residue powder into different polytetrafluoroethylene high-pressure reaction kettles, adding distilled water, and putting the polytetrafluoroethylene high-pressure reaction kettles into a constant-temperature blast drying box for a synthesis reaction. The green tea and the Tieguanyin tea are used as raw materials, the fluorescent carbon dots are synthesized through a one-step hydrothermal method, by optimizing the optimal temperature and time for preparing the carbon dots, the synthesized carbon dots have pH dependence and meanwhile show good fluorescence performance, photobleaching resistance, salt resistance and water solubility, the synthesis process is simple, consumed time is short, and the raw materials are low in price and easy to obtain; in addition, the method can be applied to research and development, preparation, fluorescence analysis and biological marking of novel fluorescent carbon nanomaterials.

Description

technical field [0001] The invention relates to the technical field of carbon dot synthesis, in particular to a method for synthesizing fluorescent carbon dots in one step using tea as a carbon source and its application. Background technique [0002] Fluorescent carbon dots (CDs), a new member of the large family of carbon nanomaterials, have attracted increasing attention due to their unique luminescent properties. After a comprehensive comparison of fluorescent carbon dots and traditional fluorescent probes, it is found that the new carbon nanomaterials have many good properties. Moreover, fluorescent carbon dots, as a luminescent material, have the function of conversion and similar functions to those of semiconductor quantum size effects. Not only that, fluorescent carbon dots also have quite special luminescent properties, its size is small, and its biocompatibility is good. The point is that its toxicity is very low, the method of synthesizing materials is simple, an...

AI Technical Summary

Problems solved by technology

In the prior art, when microwave-assisted hydrothermal method is used to synthesize carbon dots, chitosan, alginic acid, and starch are used as carbon sources to synthesize carbon dots. After the experiment, it is found that when starch is used as carbon source to synthesize carbon dots , the size of the carbon dot is the smallest and its fluorescence is the strongest. The size of the carbon dot prepared by chitosan is larger than that of the carbon dot synthesized by starch, so its fluorescence is relatively weak

[0005] Fluorescent properties, photobleaching resistance, salt resistance and water solubility of fluorescent carbon dots synthesized by methods in the prior art are unstable, and the comprehensive performance of the synthesized fluorescent carbon dots is relatively weak, and the synthesis process is cumbersome

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