Preparation method for monophosphate-adjuvant water-soluble fluorescent carbon quantum dot solid powder

Abstract

The invention discloses a preparation method for monophosphate-adjuvant water-soluble fluorescent carbon quantum dot solid powder, which belongs to the technical field of nanometre materials. The preparation method comprises the following steps of: by taking soluble phosphate solution as an adjuvant, taking saccharides, amino acids and some low-molecular-weight organic matters containing hydroxyl and carboxyl as reaction precursors and adopting a microwave heating means, directly preparing solid carbon quantum dot powder in one step; and adding an appropriate amount of ethanol aqueous solution to precipitate and removing most of salts, then performing further purification by virtue of strong-base anion exchange resin and strong-acid cation exchange resin sequentially, centrifuging and then performing rotary evaporation on the supernatant, so as to obtain the purified carbon quantum dot solid powder. The carbon quantum dots prepared by the preparation method disclosed by the invention are good in solubility in water, and solid powder samples can be stored for a long time; meanwhile, the obtained carbon quantum dots further are also excellent in water solubility and fluorescence characteristic. The whole preparation process is simple to operate, requirements on equipment are low, and raw materials are low in cost, wide and easily available; the preparation method is an environment-friendly preparation method for carbon quantum dots.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing a single phosphate-assisted water-soluble fluorescent carbon quantum dot solid powder. Background technique [0002] In recent years, carbon-based nanomaterials have attracted extensive attention due to their potential applications in electronics, biology, and other fields. The emerging zero-dimensional carbon quantum dots have good water solubility and photoluminescence properties, low toxicity, adjustable emission wavelength and excitation wavelength, and easy surface modification. They are widely used in biological detection, labeling, sensors, catalysis, drug carriers, optics and many other fields are all favored. [0003] In 2006, Sun et al. based on laser ablation technology (Sun, Y.P.; Zhou, B.; Lin, Y.; Wang, W.; Fernando, K.A.S.; Pathak, P.; Meziani, M.J.; Harruff, B.A.; Wang, X. ;Wang,H.;Luo,P.G.;Yang,H.;Kose,M.E.;Chen,B....

AI Technical Summary

Problems solved by technology

However, almost all of the obtained carbon quantum dots exist in the solution state, not only the effective yield is very low, but also the addition of passivating agent increases the difficulty of separation and purification in the post-treatment process, making it difficult to achieve large-scale production and application

Therefore, the facile and economical batch preparation of highly fluorescent carbon quantum dots is still a great challenge.

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