Method for preparing water-soluble fluorescent carbon dots

Abstract

The invention relates to a method for preparing water-soluble fluorescent carbon dots. The method comprises the following steps: by adopting a citric acid as a carbon source, urea as a passivator and a dopant and deionized water as solvents aiming at the conditions that the fluorescent carbon dots are high in accuracy and difficult to synthesize, preparing a carbon dot water solution by adopting a hydrothermal synthesis method; and preparing the carbon dots by the following processes of preparing the solution, air-tight reaction, filtering, dialyzing, freezing and drying, and grinding. The technology is advanced in process, rapid and efficient, accurate and specific in data, and good in product shape; the product is green powder particles; and the diameters of the particles are smaller than or equal to 5.5nm; the product is high in purity which can be up to 99%, and good in water-solubility which can be up to 99.5%. The method is an ideal method for preparing the fluorescent carbon dots. The product can be applied to the fields such as ion detection, bioimaging, photoelectric devices and composite materials.

Description

technical field [0001] The invention relates to a method for preparing water-soluble fluorescent carbon dots, which belongs to the technical field of preparation and application of organic carbon material carbon dots. Background technique [0002] Fluorescent carbon materials have unique advantages, such as: high light absorption rate, chemical stability, biocompatibility and low cytotoxicity; these materials mainly include: carbon dots, nanodiamonds, carbon nanotubes, fullerenes and fluorescent Graphene; fluorescent carbon materials have been applied in many aspects, such as: biological imaging, medical diagnosis, catalyst, photovoltaic device; carbon dots have broad application prospects due to early discovery and controllable parameters. [0003] Carbon dots are fluorescent carbon materials with a size less than 10nm. They were first discovered in 2004 when preparing electrophoretic purified single-walled carbon nanotubes. In 2006, they were successfully prepared for the ...

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Problems solved by technology

[0004] The synthesis methods of carbon dots are usually divided into two categories, one is the carbon source cracking method, and the other is the organic matter carbonization method; the carbon source cracking method is a method of changing from large to small, and the large carbon structure is cracked by chemical or physical methods. become carbon dots; the carbonization of organic matter is a method of changing from small to large, forming carbon dots by carbonizing the molecular precursors of small molecules or polymers; hydrothermal synthesis can also prepare carbon dots, but these synthesis methods are still in the research stage. The preparation process There are still many disadvantages and deficiencies in

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