Method for preparing water-soluble nitrogen phosphorus codoped carbon quantum dot by taking glucose, strong phosphoric acid and ethanediamine as raw materials

Abstract

The invention provides a method for preparing a water-soluble nitrogen phosphorus codoped carbon quantum dot by taking glucose, strong phosphoric acid and ethanediamine as raw materials. The method comprises the following steps: S1, preparing a glucose precursor solution; S2, mixing the glucose precursor solution and strong phosphoric acid according to the volume ratio of (1-5):3 to obtain a first mixed solution; S3, heating the first mixed solution obtained in the S2 to obtain a brown solution; S4, putting the brown solution in the S3 under the ice-water bath condition, mixing the brown solution and ethanediamine according to the volume ratio of 5:(1-5) to obtain a second mixed solution, and filtering the second mixed solution to obtain filtrate; S5, dialyzing the filtrate to obtain dialyzate; and S6, evaporating the dialyzate to obtain the water-soluble nitrogen phosphorus codoped carbon quantum dot. The preparation method of the water-soluble nitrogen phosphorus codoped carbon quantum dot has the following advantages: the carbon source is rich and cheap; the preparation process is simple; the whole preparation process is pollution-free, non-toxic and environment-friendly; and large-scale preparation can be realized.

Description

technical field [0001] The invention belongs to the technical field of fluorescent material preparation, and specifically relates to a preparation method of water-soluble nitrogen-phosphorus co-doped carbon quantum dots using glucose, concentrated phosphoric acid and ethylenediamine as raw materials under mild conditions. Background technique [0002] In recent years, fluorescent carbon nanomaterials have attracted extensive research by researchers because of their good optical properties and low cytotoxicity. It has good photostability and no toxic side ions, is suitable for long-term detection and tracing experiments, and has broad application prospects in biomarkers and analysis and detection. Carbon quantum dots (CQDs) exhibit excellent properties such as hydrophilicity, low cytotoxicity, chemical and photostability, etc., which have attracted extensive attention and applications in the fields of chemistry, biomedicine, sensing and optoelectronics. [0003] There are cu...

AI Technical Summary

Problems solved by technology

This method often requires strict experimental conditions and special energy sources, the cost is high, and the obtained carbon quantum yield is relatively low

Bottom-up synthesis method, that is, direct synthesis of fluorescent carbon quantum dots by pyrolysis or carbonization of suitable precursors, methods include: combustion method, hydrothermal carbonization method, ultrasonic method, etc., but these methods are often used Non-renewable energy and requires strict post-processing, so it is not conducive to continuous and large-scale production of fluorescent carbon quantum dots

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