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Preparation of copper ion-doped carbon quantum dots, obtained carbon quantum dots and application

A technology of carbon quantum dots and copper ions is applied in the fields of preparation and obtained carbon quantum dots and applications, and can solve the problems of limiting the application of carbon quantum dots and low quantum yield of carbon quantum dots.

Active Publication Date: 2018-06-15
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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Problems solved by technology

[0004] However, in the existing preparation methods, there is generally the problem of low quantum yield of carbon quantum dots, which limits the application of carbon quantum dots to a certain extent.

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  • Preparation of copper ion-doped carbon quantum dots, obtained carbon quantum dots and application
  • Preparation of copper ion-doped carbon quantum dots, obtained carbon quantum dots and application
  • Preparation of copper ion-doped carbon quantum dots, obtained carbon quantum dots and application

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preparation example Construction

[0044] A first aspect of the present invention provides a method for preparing copper ion-doped carbon quantum dots, the method comprising the following steps:

[0045] Step 1. Add carbon source, nitrogen source and copper source into an organic solvent to form a precursor solution.

[0046] According to a preferred embodiment of the present invention, in step 1, the carbon source is selected from organic matter containing carbon elements.

[0047] In a further preferred embodiment, in step 1, the carbon source is selected from organic matter containing -COOH and / or -COONa, such as organic matter containing -COONa.

[0048] In a further preferred embodiment, in step 1, the carbon source is selected from one or more of sodium citrate, citric acid, oxalic acid and sodium oxalate, such as sodium citrate.

[0049] Among them, the carbon source is used as the main raw material, and the carbon quantum dots are formed by the "bottom-up" method. After a lot of experiments, the inven...

Embodiment approach

[0083] According to a preferred embodiment of the present invention, the average particle size of the copper ion-doped carbon quantum dots is 2-10 nm.

[0084] In a further preferred embodiment, the average particle size of the copper ion-doped carbon quantum dots is 2-8 nm.

[0085] According to a preferred embodiment of the present invention, the fluorescence quantum yield of the copper ion-doped carbon quantum dots is above 85%.

[0086] In a further preferred embodiment, the fluorescence quantum yield of the copper ion-doped carbon quantum dots is above 90%, such as 93%.

[0087] Among them, the copper ion-doped carbon quantum dots obtained by the method of the present invention have a very high fluorescence quantum yield, reaching more than 85%, especially more than 90%, up to 93%. However, in the prior art, the fluorescence quantum yield of the carbon quantum dots is generally about 10%, and even if the fluorescence quantum yield is improved after doping with other elem...

Embodiment 1

[0105] Mix 0.5882g of sodium citrate, 0.2404g of urea, 0.2680g of copper chloride and 20mL of toluene to form a precursor solution;

[0106] The obtained precursor solution was placed in a 50mL polytetrafluoroethylene-lined stainless steel autoclave, sealed and reacted at a temperature of 200°C for 12 hours, and the synthesized product was naturally cooled;

[0107] The product is separated by a cylindrical membrane separation filter and dried in vacuum at -50° C. to obtain copper ion-doped carbon quantum dot powder.

[0108] The obtained copper ion-doped carbon quantum dot powder was dispersed again with toluene, and the fluorescence quantum yield was measured to be 87.7%.

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Abstract

The invention discloses preparation of copper ion-doped carbon quantum dots, obtained carbon quantum dots and application. A carbon source, a nitrogen source, and a copper source are dispersed in an organic solvent, and a solvothermal reaction is performed to obtain the copper ion-doped carbon quantum dots. The preparation method is simple, complex functional groups are not required to be introduced for an organic reaction, a simple mixing and heating reaction is performed, and the preparation method is suitable for industrial application; in addition, the obtained copper ion-doped carbon quantum dots have a very high fluorescence quantum yield, which is up to 93%; meanwhile, the copper ion-doped carbon quantum dots have good fluorescence performance in the organic solvent, but the fluorescence intensity is obviously quenched after addition of a small amount of water, so that the copper ion-doped carbon quantum dots can be applied to detection of the water content of the organic solvent and the detection limit can reach 0.01%.

Description

technical field [0001] The invention relates to the field of nano fluorescent materials, in particular to carbon quantum dots, in particular to the preparation of copper ion-doped carbon quantum dots, the obtained carbon quantum dots and their applications. Background technique [0002] With the rapid development of nanotechnology, new nanofluorescent materials are widely used in cell labeling, cell imaging, medical diagnosis, analysis and detection, etc. due to their advantages such as simple preparation, photobleaching resistance, high sensitivity, and wide dynamic range. New nano-fluorescent materials mainly include two categories: semiconductor quantum dots and carbon quantum dots. Among them, carbon quantum dots have similar fluorescence properties to semiconductor quantum dots, and also have low toxicity and good biocompatibility that semiconductor quantum dots do not have. advantages, it has received extensive attention. [0003] Carbon quantum dots refer to spherica...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01N21/64B82Y20/00B82Y30/00
CPCB82Y20/00B82Y30/00C09K11/65G01N21/6428G01N2021/6432
Inventor 王锐魏建斐袁野李海阔
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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