Rapid synthesis method for high-quantum-yield fluorescent carbon dots

Abstract

The invention discloses a rapid synthesis method for high-quantum-yield fluorescent carbon dots. The method comprises the following steps: (1) mixing citric acid monohydrate and ethylenediamine, and uniformly stirring to obtain a mixed solution; (2) adding the mixed solution in the step (1) into a microwave reactor for reaction, and setting the temperature as 130 DEG C; (3) cooling to obtain a brown liquid product, injecting the brown liquid product into a dialysis bag for dialysis, collecting liquid in the dialysis bag, performing rotary evaporation concentration, and freeze-drying concentrated samples to obtain the fluorescent carbon dots, wherein the molecular weight of the dialysis bag is 500Da. The operation is simple, and raw materials are easily obtained and cheap. Reaction conditions can be regulated, the quantum yield of the obtained carbon quantum dots is high, the problem that rapid large-scale production cannot be carried out by a conventional fluorescent carbon dot preparation method due to the limitation of a process and the raw materials is solved, and the problem of lower quantum yield of the carbon quantum dots is solved. The fluorescent carbon dots can be used for metal ion detection, biological marking, biological imaging and the like.

Description

technical field [0001] The invention relates to the fields of chemistry and nanometer material science, more specifically, the invention relates to a method for synthesizing fast and high-quantum-yield fluorescent carbon dots. Background technique [0002] Carbon quantum dots are the most important kind of fluorescent carbon nanomaterials, also known as carbon dots, carbon nanodots and carbon nanocrystals, which are monodisperse and nearly quasi-spherical in size below 10nm Emerging carbon nanofunctional materials. Compared with traditional semiconductor quantum dots and organic dyes, fluorescent carbon quantum dots have small particle size, good water solubility, high chemical inertness, easy functionalization, photobleaching resistance, low toxicity, and good biocompatibility. The preparation methods of quantum dots and organic dyes are cumbersome, expensive, environmentally unfriendly, and prone to photobleaching and other problems. [0003] The application of fluoresce...

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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