A kind of nitrogen-doped carbon quantum dot and its preparation method and application

Abstract

The invention discloses a nitrogen-carbon-doped quantum dot as well as a preparation method and application thereof. The preparation method comprises the following steps: heating and mixing organic acid organic amine to obtain nitrogen-doped quantum dot aqueous dispersion; then adding sodium citrate and potassium tartrate; putting the mixture in a reaction kettle for reacting; sequentially carrying out pressurized reaction, extraction and freezing vacuum drying, thus obtaining a finished product. The method disclosed by the invention is simple in operation, environment-friendly and low in requirement on equipment; the prepared nitrogen-carbon-doped quantum dot has excellent luminous property, and can be widely applied to the fields of radio and television materials, bioimaging, fluorescent probes and the like.

Description

technical field [0001] The invention relates to the technical field of material science, in particular to a nitrogen-doped carbon quantum dot and its preparation method and application. Background technique [0002] Quantum dot material is a quasi-zero-dimensional nanomaterial, usually referring to a semiconductor nanocrystal whose radius is smaller than the exciton Bohr radius, and has a significant quantum confinement effect. Traditional quantum dots refer to semiconductor quantum dots, which are composed of rare earth elements II-VI and III-V group elements (such as CdS, PbS, CdSe, InAs, InP, etc.). Such quantum dots have high toxicity, high preparation cost and serious environmental pollution, which limit their wide application. In 2004, Professor Walter A. Scrivens of La Carolina State University in the United States accidentally discovered a carbon nanoparticle fluorescent material when preparing single-walled carbon nanotubes, that is, it can emit bright light when e...

AI Technical Summary

Problems solved by technology

At present, there are many methods for preparing carbon quantum dots, such as laser etching method, electrochemical method, arc discharge method, microwave method, etc., but these methods are very complicated in terms of raw materials and preparation processes, cumbersome to operate, and expensive raw materials and equipment. , the process is cumbersome, the yield is low, and the quantum yield is extremely low (<10%), and further post-processing is often required to obtain carbon quantum dots with high fluorescence yield and good luminescence performance, which also greatly limits the carbon quantum dots. large-scale preparation and wide application