Method for large-scale preparation of high-efficiency red/near-infrared emission fluorescent carbon dot

Abstract

The invention discloses a method for large-scale preparation of high-efficiency red / near-infrared emission fluorescent carbon dots. The method comprises the following steps: o-phenylenediamine and aninorganic metal salt are ground into powder with uniform granules, the mixed powder of o-phenylenediamine and inorganic metal salt or a mixture of o-phenylenediamine and dilute hydrochloric acid is transferred to the lining of a reaction kettle, then packaged, and transferred to a drying oven, and the reaction temperature and reaction time are set, the temperature of the drying oven is cooled to room temperature after the reaction is completed, and the reaction kettle is taken out to obtain a product; and the product is washed and dried. Compared with the prior art, the method of the inventionhas the advantages of simple and convenient reaction, no purification, low cost, convenient mass production, good environmental stability, and convenient storage and transportation, and the preparedfluorescent carbon dots have excellent red fluorescence performance and four-photon fluorescence property, and realizes the fluorescence emission of the carbon dot in the near-infrared third window for the first time; and the carbon dot product can meet the fabrication requirements of various optoelectronic devices without complicated modification at the later stage.

Description

Technical field [0001] The invention belongs to the technical field of methods for preparing fluorescent carbon dots, and specifically relates to a method for large-scale preparation of high-efficiency red / near-infrared emitting fluorescent carbon dots. Background technique [0002] Nowadays, nanomaterials have gradually entered all areas of our lives. A variety of carbon-based fluorescent nanomaterials, such as carbon nanodots, fluorescent carbon nanotubes, polymer dots, graphene quantum dots and nanodiamonds, have been synthesized and applied. Carbon nanomaterials have aroused extensive research by scientists because of their huge potential in various technological applications. The excellent electronic and physicochemical properties of carbon dots have attracted great attention from researchers in recent years. [0003] As an emerging fluorescent nanomaterial, carbon dots have huge application potential in chemical sensing, bioimaging, drug delivery, photodynamic therapy, phot...

AI Technical Summary

Problems solved by technology

However, there are still large questions regarding the efficient synthesis of fluorescent carbon dots with infrared and near-infrared emission

[0004] The maximum emission wavelength of the reported red fluorescent carbon dots does not exceed 760nm, and most of the fluorescence efficiency is very low, and the fluorescence intensity is weak, which greatly limits the application of carbon dots in the field of luminescence and biological imaging.

At present, there are few reports on high-efficiency red fluorescent carbon dots. Most of the synthesized carbon dots are almost synthesized in the liquid phase environment, and need to be further purified. The process is very cumbersome and the production cost is relatively high. In order to synthesize efficient red fluorescent carbon dots The researchers used the solvothermal method to control the formation of sp2 domains or modify the surface functional groups of carbon dots to conduct experiments. The efficiency of red carbon dots synthesized by this method is often not high, the environmental stability is poor, and it is difficult to store for a long time, which is not conducive to further research. technology application

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