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Green synthetic method for blue fluorescence carbon quantum dots with high fluorescence quantum yield

A technology of fluorescence quantum yield and blue fluorescence, which is applied in the field of green preparation of blue fluorescent carbon quantum dots with high fluorescence quantum yield, can solve the problems of not being able to withstand ultraviolet radiation for a long time, three wastes, complex production process, etc. Achieve good photobleaching resistance, stable product performance and good solubility

Inactive Publication Date: 2015-09-23
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these chemical doping methods can improve the fluorescence quantum yield of carbon quantum dots, the fluorescence quantum yield is still very low and cannot meet the performance requirements of actual products (the fluorescent whitening agent quantum yields currently used are mostly higher than 50% ), or the price of raw materials is too expensive, and the separation process is too complicated to be practically applied
[0006] To sum up, most of the currently widely used fluorescent whitening agents contain aromatic ring structures, which may cause harm to the human body; at the same time, due to the relatively complicated production process, there are three wastes generated during the production process, which may cause damage to the environment
Fluorescent markers (organic fluorescein), which are widely used in biology, have poor photobleaching resistance and cannot withstand long-term ultraviolet irradiation

Method used

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  • Green synthetic method for blue fluorescence carbon quantum dots with high fluorescence quantum yield
  • Green synthetic method for blue fluorescence carbon quantum dots with high fluorescence quantum yield
  • Green synthetic method for blue fluorescence carbon quantum dots with high fluorescence quantum yield

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Fully mix 1.0g citric acid and 1.2g glycine (mass ratio is 1:1.2), add into a stainless steel container, and spread out, the solid mixture is directly heated to 160°C in an oven, and after continuing to react for 45min, Let cool at room temperature.

[0036] (2) Add tetrahydrofuran solvent to the product obtained in step (1), and fully extract for 5 hours.

[0037] (3) The product of step (2) is filtered, and the filtrate is distilled to remove the organic solvent, thus obtaining blue fluorescent carbon quantum dots with high fluorescence quantum yield, and the transmission electron microscope image of the carbon quantum dots is as attached figure 1 shown. Its fluorescence emission spectrum is attached as figure 2 shown. The results of fluorescence quantum yield measurement after extraction are shown in the attached image 3 , 4 As shown, the fluorescence quantum yield increased from 20.8% ahead of extraction to 59.8%.

Embodiment 2

[0039] (1) Fully mix 1.0g citric acid and 1.5g glycine (mass ratio is 1:1.5), add to a stainless steel container, and spread out, the solid mixture is directly heated to 180°C in an oven, and after the continuous reaction for 30min, Let cool at room temperature.

[0040] (2) Add ethanol solvent to the product obtained in step (1), and fully extract for 6 hours.

[0041] (3) Same as Example 1 (3), the fluorescence quantum yield is increased from 18.0% ahead of extraction to 57.2%.

Embodiment 3

[0043] (1) Fully mix 1.2g of citric acid and 1.0g of glycine (mass ratio is 1.2:1), add to stainless steel, and spread out, the solid mixture is directly heated to 140°C in the oven, after continuous reaction for 60min, room temperature Leave to cool.

[0044] (2) Add methanol solvent to the product obtained in step (1), and fully extract for 8 hours.

[0045] (3) Same as Example 1 (3), the fluorescence quantum yield is increased from 16.5% ahead of extraction to 51.0%.

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Abstract

The invention discloses a green synthetic method for blue fluorescence carbon quantum dots with high fluorescence quantum yield, and belongs to the technical field of fine chemical engineering. The method adopts a mixture of citric acid and glycine as a raw material, the solid mixture is heated directly to a certain temperature for a certain time, so that the solid mixture is dehydrated, after cooling to indoor temperature, the mixture is extracted by a low boiling point organic solvent, and the fluorescence quantum yield of the obtained carbon quantum dots is much higher than the fluorescence quantum yield of carbon quantum dots which are not processed by the organic solvent. The adopted raw material is easy to obtain, cheap and free of poison, three wastes are not generated in the preparing process, the operation is simple and convenient, and the raw material is easy to control. Due to the fact that the higher high fluorescence quantum yield, blue fluorescence emission and good photobleaching resistance are achieved, the carbon quantum dots can serve as a fluorescent whitening agent and be applied to production of paper pulp, scouring agents and washing powder, and the carbon quantum dots can serve as fluorescence markers of biomolecules.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a green preparation technology of blue fluorescent carbon quantum dots with high fluorescent quantum yield. Background technique [0002] In recent years, people have shown great enthusiasm for the research of carbon quantum dots. Under the excitation of ultraviolet light, it can emit specific fluorescence; it is non-toxic and environmentally friendly; in addition, it can be prepared from a wide range of raw materials, graphite and a wide variety of carbohydrates and some organic small molecule compounds are the preparation of carbon quantum Dot of ingredients. According to its physical, chemical and fluorescent properties, carbon quantum dots with blue fluorescence should have potential applications in the field of fine chemicals. It can be used as a fluorescent whitening agent in the fields of textile fibers, plastics, papermaking, detergents, etc. , It is expected to ...

Claims

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Application Information

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IPC IPC(8): C09K11/65C01B31/02
Inventor 刘祥刘朋朋张厂厂刘斌胡鹏
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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