Method for preparing nitrogen and sulfur-doped fluorescent carbon quantum dots

A technology of carbon quantum dots and nitrogen sulfur, which is applied in the field of preparation of fluorescent carbon quantum dots, can solve the problems that limit the large-scale production and practical application of fluorescent carbon quantum dots, the cumbersome synthesis process, and the high cost of synthesis, so as to achieve easy promotion and large-scale The production and preparation process equipment is simple and the effect of low cytotoxicity

Active Publication Date: 2015-03-25
NANCHANG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] So far, many methods such as laser exfoliation of graphene, electrochemical oxidation, arc discharge method, solvent hydrothermal method, chemical oxidation method and pyrolysis method have been used for the preparation of carbon quantum dots. However, most of these methods The synthesis process is cumbersome, the raw materials are expensive and the conditions are harsh. These methods are not only uneconomical and environmentally friendly, but also due to the high cost of synthesis, to a large extent limit the large-scale production and practical application of fluorescent carbon quantum dots.

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  • Method for preparing nitrogen and sulfur-doped fluorescent carbon quantum dots
  • Method for preparing nitrogen and sulfur-doped fluorescent carbon quantum dots
  • Method for preparing nitrogen and sulfur-doped fluorescent carbon quantum dots

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Experimental program
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Effect test

Embodiment 1

[0026] (1) Put 0.6 g of citric acid and 0.2 g of L-glutathione powder into an agate mortar and grind to obtain a uniform white powder;

[0027] (2) Put the above-mentioned white powder into a microwave oven, use 700 W power, and microwave for 1.5 min to obtain a white carbon quantum dot solid;

[0028] (3) Dissolve the white solid obtained in (2) into 5 mL of water, and ultrasonically obtain a uniform carbon quantum dot solution;

[0029] (4) The solution obtained in step (3) was injected into a dialysis bag for dialysis, the molecular weight cut-off was 500 D, the dialysis time was 48 h, and the water was changed every 6 h;

[0030] (5) The dialysis product is evaporated to obtain a concentrated solution;

[0031] (6) Freeze-dry the concentrated solution at –50 °C to powder to obtain nitrogen-sulfur-doped carbon quantum dots with a yield of about 2% and a quantum yield of about 4.5%.

Embodiment 2

[0033] (1) Put 0.6 g of citric acid and 0.2 g of L-glutathione powder into an agate mortar and grind to obtain a uniform white powder;

[0034] (2) Put the above-mentioned white powder into a microwave oven, adopt 700 W power, microwave radiation for 2 min, and obtain brown carbon quantum dot solid;

[0035] (3) Dissolve the brown solid obtained in (2) into 5 mL of water, and ultrasonically obtain a uniform carbon quantum dot solution;

[0036] (4) The solution obtained in step (3) was injected into a dialysis bag for dialysis, the molecular weight cut-off was 500 D, the dialysis time was 48 h, and the water was changed every 6 h;

[0037] (5) The dialysis product is evaporated to obtain a concentrated solution;

[0038] (6) Freeze-dry the concentrated solution at –50 °C to powder to obtain nitrogen-sulfur-doped carbon quantum dots with a yield of about 12% and a quantum yield of about 50%.

Embodiment 3

[0040] (1) Put 0.6 g of citric acid and 0.2 g of L-glutathione powder into an agate mortar and grind to obtain a uniform white powder;

[0041] (2) Put the above-mentioned white powder into a microwave oven, use 700 W power, and microwave for 2.5 minutes to obtain a reddish-brown carbon quantum dot solid;

[0042] (3) Dissolve the reddish-brown solid obtained in (2) into 5 mL of water, and ultrasonically obtain a uniform carbon quantum dot solution;

[0043] (4) The solution obtained in step (3) was injected into a dialysis bag for dialysis, the molecular weight cut-off was 500 D, the dialysis time was 48 h, and the water was changed every 6 h;

[0044] (5) The dialysis product is evaporated to obtain a concentrated solution;

[0045] (6) The concentrated solution was freeze-dried at –50 °C to powder to obtain nitrogen-sulfur-doped carbon quantum dots with a yield of about 15% and a quantum yield of about 68%.

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Abstract

The invention discloses a method for preparing nitrogen and sulfur-doped fluorescent carbon quantum dots. According to the method, citric acid is taken as a carbon source, L-glutathione is taken as a nitrogen-sulfur dopant, a microwave oven is taken as a reaction platform, the carbon quantum dots with fluorescence properties are prepared in a heating manner, the residues and moisture are removed through dialysis and freeze drying, and quantum dot powder is obtained. The nitrogen and sulfur-doped carbon quantum dots are prepared by adopting the method disclosed by the invention; the method is simple in operation, low in cost, high in yield, simple in preparation process and equipment, free of a solvent, and easy to popularize and produce on a large scale, and can be rapidly finished within a short period of time; and the prepared carbon quantum dots have the advantages of good water solubility, high fluorescence properties, photobleaching resistance, adjustable emission spectrum, good biocompatibility, low cytotoxicity and the like, and have a good application prospect in the fields of bioimaging, biosensors and photo-electric devices.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a method for preparing nitrogen-sulfur-doped fluorescent carbon quantum dots. Background technique [0002] In recent years, carbon quantum dots (Carbon dots, particle size < 10 nm), as a new type of zero-dimensional nano-fluorescent material, has attracted great attention from researchers. Compared with organic dyes and traditional heavy metal semiconductor quantum dots, carbon quantum dots can be potentially used in Sensors, photocatalysis, bioimaging and solar cells. [0003] So far, many methods such as laser exfoliation of graphene, electrochemical oxidation, arc discharge method, solvent hydrothermal method, chemical oxidation method and pyrolysis method have been used for the preparation of carbon quantum dots. However, most of these methods The synthesis process is cumbersome, the raw materials are expensive, and the conditions are harsh. These methods are not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
Inventor 王勇庄欠粉倪永年
Owner NANCHANG UNIV
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