A kind of fluorescent carbon nanoparticle and its preparation method and application

Abstract

The invention provides fluorescent carbon nanoparticles as well as a preparation method and an application thereof. A solution containing fluorescent carbon nanoparticles can be obtained by use of steps that paper is burnt, the ash obtained is ground into a powder, the powder is dispersed in an alkaline solution, next, a heating reaction is carried out, and then filtering and dialysis are carried out. The preparation method is high in quantum yield which can be 30%; the fluorescent carbon nanoparticles obtained have a grain size ranging from 2 to 4 nanometers, and are homogeneous in size and good in dispersibility; lots of oxygen-containing groups are carried on the surfaces of the fluorescent carbon nanoparticles so that the fluorescent carbon nanoparticles are applicable to the fields of biochemical detection and sensing.

Description

technical field [0001] The invention belongs to the field of nanoparticle preparation, and particularly relates to a fluorescent carbon nanoparticle and a preparation method and application thereof. Background technique [0002] Quantum dots play an important role in biomarkers and detection due to their excellent light resistance and spectral tunability. However, due to the highly toxic elements such as cadmium, selenium, and lead contained in quantum dots, the harm to the environment limits their practical application. Carbon nanoparticles (referred to as carbon dots or carbon quantum dots) are one of the most popular carbon nanomaterials after fullerenes, carbon nanotubes and graphene. This nanomaterial not only has excellent fluorescence properties such as strong fluorescence stability, resistance to photobleaching, no light flickering, and adjustable emission wavelength, but also has the advantages of low toxicity, small molecular weight and particle size, and easy to ...

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Problems solved by technology

However, these methods more or less have the following shortcomings: expensive instruments and consumables, complicated process operations, difficulties in sample pretreatment and subsequent separation, etc.

For example, the Chinese invention patent application with the application number 201110049051.X and titled "A Preparation Method for Carbon Quantum Dots" discloses a method for preparing fluorescent carbon quantum dots using plant stems as raw materials, although the preparation method Raw materials are cheap and easy to obtain, but the process steps are cumbersome, requiring high equipment requirements and professional operating techniques, which takes a long time and is not conducive to large-scale production

[0005] The Chinese invention patent application with the application number 201210264411.2 and titled "Preparation Method of Photoluminescent Carbon Quantum Dots" discloses a method for the preparation of fluorescent carbon quantum dots using soybean dregs after extracting soybean milk as raw materials, although the process of this method It is relatively simple, but requires a lot of pretreatment of raw materials. In addition, the particle size uniformity of the carbon quantum dots prepared in the examples is poor, and the particle size range is wide, about 3 to 12nm

[0006] The Chinese invention patent application with the application number 201310219900.0 and titled "Preparation Method of Fluorescent Carbon Quantum Dots" discloses a method for the preparation of fluorescent carbon quantum dots using plant leaves as raw materials, although the preparation process of this method is simple and the particle size is relatively uniform , but the dispersibility is very poor, and the prepared carbon dots are easy to agglomerate together, which is not conducive to subsequent bioimaging applications

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