Method for preparing multicolor fluorescent carbon dot by solvent-free technology, and multicolor fluorescent carbon dot prepared therethrough

Abstract

The invention discloses a method for preparing a multicolor fluorescent carbon dot by a solvent-free technology, and the multicolor fluorescent carbon dot prepared therethrough. The method comprises the following steps: proportionally mixing different aniline derivatives with inorganic metal salts, grinding the obtained mixture to form a powder, transferring the mixed powder into a reaction kettlelining, carrying out a heat preservation reaction at 140-200 DEG C for 5-10 h, naturally cooling the obtained reaction product to room temperature after the reaction is finished, and washing and drying the reaction product to obtain the blue, green and red fluorescent carbon dot. The preparation method has the advantages of no additional addition of a reaction solvent, great reduction of the reaction pressure in a kettle, great improvement of the experiment safety, reduction of the material synthesis cost, simplicity and fastness in preparation and purification processes, obtaining of the product only by deionized water washing and drying, large-scale production and high yield.

Description

technical field [0001] The invention relates to the technical field of preparation of fluorescent carbon dots, in particular to a method for preparing multicolor fluorescent carbon dots by a solventless method and the prepared multicolor fluorescent carbon dots. Background technique [0002] As a new type of luminescent material, carbon dots have aroused great interest once discovered. Carbon dots are spherical fluorescent carbon nanoparticles with a size less than 10nm dispersed, including carbon nanodots, graphene quantum dots and polymer dots. The carbon sources required for the preparation of carbon dots are widely available and cheap. Compared with traditional fluorescent dyes and quantum dots, carbon dots not only have excellent fluorescence properties, but also have good water solubility and photobleaching resistance, and have low toxicity and good biocompatibility. It shows broad application prospects in the fields of chemical sensing, optoelectronic devices, biolo...

AI Technical Summary

Problems solved by technology

Since the luminescent center of carbon dots is still uncertain, the preparation method of multicolor carbon dots is relatively complicated, so there are certain difficulties in the preparation of long wavelength and multicolor fluorescent carbon dots, which limits the application of carbon dots in the fields of biological imaging and optoelectronic devices. application

[0004] At present, most of the synthesis methods of carbon dots are solvothermal synthesis. Because the reaction process is uncontrollable and the synthesis of carbon dots is not uniform, it usually needs further separation and purification, which has many limitations.

For example, the synthesis efficiency of carbon dots is low and the pressure required in the kettle is high, the price is expensive, the operation is dangerous, and it cannot be prepared on a large scale

Moreover, the preparation method of multicolor carbon dots is complex and the purification process is extremely cumbersome, the synthesis efficiency is low, the experimental conditions are relatively harsh, and the product collection is difficult, so the synthesis of three primary color carbon dots is still quite challenging.

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