Preparation method of nitrogen-sulfur co-doped carbon quantum dot

Abstract

The invention discloses a preparation method of a nitrogen-sulfur co-doped carbon quantum dot. According to the preparation method, a durian is peeled, a certain amount of durian pulp and ultrapure water are added into a hydrothermal reactor, then the hydrothermal reactor is sealed and placed in a baking oven or a muffle furnace to carry out hydrothermal reactions; after reactions, the hydrothermal reactor is taken out and cooled, and the reaction product is subjected to centrifugation, filtering, and freeze-drying to obtain the nitrogen-sulfur co-doped carbon quantum dot. The preparation method has the advantages that the raw materials are cheap and easily available, the prepared nitrogen-sulfur co-doped carbon quantum dot has a good dispersing property, the agglomeration is avoided, theproduct purity is high, no impurity exists, the size of prepared carbon quantum dots is uniform, moreover, the carbon quantum dot has an excellent water soluble property and can be stably dispersed inwater; after long time storage, the quality is not reduced, the nitrogen content is as high as 6.7%, the sulfur content is as high as 4.8%, and the preparation method is green, simple, convenient, fast, and efficient, and is suitable for large-scale preparation and industrial production.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a method for preparing nitrogen and sulfur co-doped carbon quantum dots. Background technique [0002] Carbon quantum dots, also known as carbon nanoparticles, are carbon nanospheres with a size below 10 nanometers. They are a new type of carbon nanomaterials after fullerenes, carbon nanotubes and graphene. Compared with traditional semiconductor quantum dots, carbon quantum dots not only have the advantages of stable optical properties and easy surface functionalization, but also have better water solubility, adjustable optical size, lower biological toxicity, and good biophasic properties. Capacitance and stable chemical properties make it a good substitute for traditional semiconductor quantum dots in applications such as biomarkers, bioimaging, sensors, drug / gene delivery, optoelectronic devices, and photocatalysis. [0003] At present, the preparation...

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Problems solved by technology

However, the synthesis of nitrogen and sulfur co-doped carbon quantum dots still has the following problems: First, the raw materials used are relatively expensive, and nitrogen and sulfur are synthesized by using various raw materials such as carbon source, nitrogen source, sulfur source, additives, etc. Co-doped carbon quantum dots, nitrogen source and sulfur source are generally introduced by introducing substances such as thiourea, cysteine, sulfonamide, thiocyanamide, dithiooxamide, polythiophene derivatives or ionic liquids The second is that there are many synthesis steps, which lead to a cumbersome preparation process for nitrogen and sulfur co-doped carbon quantum dots, which is not easy for large-scale production and application promotion

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