Preparation technology of water-solubility fluorescent carbon quantum dot

Abstract

The invention discloses a preparation technology of a water-solubility fluorescent carbon quantum dot. The preparation technology comprises the following steps of: adding glucose to a dried florence flask containing diethyl malonate according to a proportion of 5g / 20 milliliter, cooling to a room temperature after refluxing at 140-160 DEG C, collecting brown precipitates, and carrying out vacuum drying for 2 hours at 100-120 DEG C; and dissolving the dried precipitates in a 10ml of distilled water, carrying out high-speed centrifugal seperation (1200r / m) to remove a trace amount of precipitates, and cooling and drying the centrifuged solvent, thus obtaining a target fluorescent carbon point. The preparation technology is simple in the entire flow operation, low in cost and high in feasibility, can be used for macro-production of the water-solubility fluorescent carbon quantum dot and meets industrialization application; the particle size of the product is uniform and is mainly in the range of 2-4 nanometers; the fluorescence quantum efficiency is high and can reach 24%; added ions do not need to be removed by dialysis during after treatment as no positive ions are added in the preparation process; and the water-solubility fluorescent carbon quantum dot has good water-solubility and can be widely applied in practical application.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a preparation process of water-soluble fluorescent carbon quantum dots. Background technique [0002] At present, the preparation of fluorescent carbon quantum dots generally adopts nitric acid oxidation method, electrochemical method, laser ablation method, pyrolysis method and hydrothermal synthesis method, etc., all of which have some shortcomings, such as: [0003] Nitric acid oxidation method is used to prepare carbon dots by reflowing strong oxidizing acid with carbon nanotubes or candle ash. The fluorescence quantum efficiency is not high, and a large amount of strong acid is not conducive to mass production; [0004] Electrochemical methods and laser ablation methods require the use of electrochemical devices and laser ablation devices, which are difficult to operate in ordinary experiments; [0005] At present, carbon dots prepared by pyrolysis ...

AI Technical Summary

Problems solved by technology

[0003] Nitric acid oxidation method is used to prepare carbon dots by reflowing strong oxidizing acid with carbon nanotubes or candle ash. The fluorescence quantum efficiency is not high, and a large amount of strong acid is not conducive to large quantities Production;

[0004]Electrochemical method and laser ablation method require the use of electrochemical devices and laser ablation devices, which are difficult to operate in ordinary experiments;

[0005] At present, carbon dots prepared by pyrolysis method are mostly lipophilic and poor in water solubility;

[0006]The hydrothermal synthesis method generally requires high temperature reaction (180-200 degrees Celsius), which has potential safety hazards

[0007]In short, most of the current methods for preparing carbon dots have defects such as multi-step operations, complicated procedures, and low fluorescence quantum efficiency (less than 6%).