A kind of preparation method of solid carbon quantum dot

Abstract

The invention belongs to the technical field of preparation of carbon quantum dot materials, and relates to a preparation method for solid-state carbon quantum dots. The preparation method comprises the following steps: firstly, mixing an ionic liquid with nitrile substances, and putting the mixture, as an electrolytic solution, into an electrolytic tank; respectively selecting two platinum electrodes, of which the area is no smaller than 1.0 cm<2>, as an anode and a cathode, and putting the anode and the cathode into the electrolytic tank, and switching on a power supply to react, thereby obtaining a light brown solution mixed with solid-state substances; then, carrying out suction filtration on the light brown solution mixed with the solid-state substances, carrying out vacuum-drying on the solid substances obtained by suction filtration, and transferring the solid substances into a clean container vessel, thereby obtaining the solid-state carbon quantum dots. The preparation method is simple in preparation process, convenient in operation, accessible in principle, and low in cost; the prepared solid-state carbon quantum dots are good in water solubility, stable in fluorescent property, and easy to store and transport.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of preparation of carbon quantum dot materials, and relates to a bottom-up process for preparing carbon quantum dots by an electrochemical method based on non-carbon electrodes, especially a preparation method using a mixture of ionic liquid and nitriles as an electrolyte A method for solid carbon quantum dots, and applying the prepared carbon quantum dots to the field of metal ion detection. [0003] Background technique: [0004] Carbon quantum dots are a new type of carbon nanomaterials, which have many advantages such as abundant raw materials, stable properties, low toxicity, and good biocompatibility, and have great application potential in the fields of cell imaging, optoelectronics, and biochemical sensors. At present, there have been many reports on the preparation of carbon quantum dots, which are mainly divided into two categories: top-down and bottom-up. , carbon fiber, etc.) to exfoliate...

AI Technical Summary

Problems solved by technology

[0005] Compared with other methods, the electrochemical methods that have been publicly reported in the prior art have the advantages of simple devices and manufacturing processes, but the current electrochemical methods for producing carbon quantum dots are generally top-down, using carbon-containing electrodes For example, graphite rods or 3D graphene are used as anodes, and at the same time provide raw materials for the preparation of carbon quantum dots. During the production process, the anode is continuously peeled off to produce carbon quantum dots, which causes damage to the electrodes.

At present, there have been some reports on electrolytic buffers that can be used to generate quantum dots by electrochemical methods, such as mixed solutions containing ionic liquids, ethanol-doped NaOH solutions, and PBS buffers. The efficiency is high, and carbon quantum dots functionalized by ionic liquid can be obtained at the same time; there are also research reports using 3D graphene as an anode, and using a mixture of acetonitrile and ionic liquid as an electrolyte to prepare carbon quantum dots, but the synthesis cost of 3D graphene is high. Therefore, the large-scale production and application of carbon quantum dots are limited.

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