Method for batch green synthesis of nitrogen and phosphorus doped fluorescent carbon dots

Abstract

The invention provides a method for batch green synthesis of nitrogen and phosphorus doped fluorescent carbon dots, wherein the method comprises the following steps: a first step, adopting a high-boiling-point polar organic solvent as a reaction medium, wherein the boiling point of the high-boiling-point polar organic solvent is greater than 180 DEG C; a second step, adopting organic small molecules as a carbon dot precursor, and adopting an auxiliary combination synthesis reagent; a third step, by a solvothermal reaction, mixing and dissolving the carbon dot precursor, phosphoric acid and the auxiliary combination synthesis reagent in the high-boiling-point polar organic solvent, controlling the reaction temperature and the reaction time, and preparing nitrogen and phosphorus doped fluorescent carbon dots; and a fourth step, purifying the mixed solution after the reaction of the third step, to obtain the high-purity fluorescent carbon dots. The water-soluble carbon dots with high fluorescence quantum yield can be further prepared in batch, and the fluorescent emission wavelength of the fluorescent carbon dots is controlled by controlling the reaction temperature and the reaction material ratio; the preparation process is green and pollution-free, has no need of special equipment, has the cost reduced, and is prone to realization of batching and scaling production.

Description

technical field [0001] The invention belongs to the multi-cross research fields of nanometer material science, electronic information, biomedical engineering, etc., and specifically relates to a key new technology for batch green synthesis of nitrogen and phosphorus doped fluorescent carbon dots. Background technique [0002] Fluorescent carbon dots are currently recognized as one of the most ideal materials to replace traditional cadmium-based quantum dots. Due to its full-band absorption of visible light, adjustable emission bands, good biosafety and biocompatibility, high chemical stability, diverse synthesis methods, and simple and easy-to-obtain raw materials, these are also diverse preparation methods for fluorescent carbon dots. Applications involve the fields of biomedicine, biosensing and detection, optoelectronic devices and catalysis. The current methods for preparing carbon dots are generally divided into two categories: "top-down" and "bottom-up". The "top-dow...

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Problems solved by technology

However, this method requires high temperature and a special microwave reactor, and the article does not involve the cost and yield of preparing carbon dots.

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