A carbon quantum dot preparing method

Abstract

A carbon quantum dot preparing method is disclosed. The method includes cleaning a carbon-containing precursor in an ultrasonic cleaner, drying the carbon-containing precursor to obtain a dried product, adding the dried product to an autoclave, adding a NaOH solution, sealing the autoclave, putting the autoclave to a drying oven, performing a hydrothermal reaction, taking the autoclave out after the autoclave is cooled, filtering a liquid mixture in the autoclave with double layers of filter paper to obtain a filtrate, centrifuging and filtering the filtrate to obtain a supernatant liquid, adding the supernatant liquid into a dialysis bag, performing dialysis, putting the dialyzate in the dialysis bag to a freeze-drying oven, and freeze-drying the dialyzate to obtain solid carbon quantum dots. According to the method, waste paper, waste cloth or waste cotton which are wide in source, economical and environment friendly are adopted as the carbon-containing precursor, and the quantum dots prepared by a hydrothermal process and through steps of filtration, centrifugation, dialysis, and the like are high in yield, uniform in structure and good in dispersibility.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a preparation method of carbon quantum dots. Background technique [0002] As a new type of fluorescent carbon nanomaterial, carbon quantum dots are composed of sp2 hybridized carbon atoms on the surface and sp3 carbon atoms inside. The surface of the carbon quantum dots obtained in the experiment has a large number of functional groups such as hydroxyl and carboxyl groups. The existence of these functional groups makes the content of carbon in the carbon quantum dots relatively low, while the content of oxygen is relatively high. Compared with traditional semiconductor quantum dots (such as CdSe, CdTe, CdS, GaAs and InAs, etc.), carbon quantum dots are non-toxic and environmentally friendly, have good water solubility, low preparation cost, good physical and chemical stability, and are easy to chemically modify their surface. Modification, and more impor...

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Problems solved by technology

At present, the carbon-containing precursors of carbon quantum dots prepared by hydrothermal method include glucose, citric acid, amino acid, nucleic acid, ascorbic acid, etc. These reagents are expensive and not suitable for wide application; there are also organic substances mainly including seeds, bananas, and watermelon slices. etc. are carbon-containing precursors, but the obtained carbon quantum dots have many impurities and the yield of carbon quantum dots is not high, and they are not suitable for wide application

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