Nitrogen-doped high-luminescent carbon quantum dot and preparation method thereof

A technology of carbon quantum dots and luminescence, which is applied in the field of nanomaterials, can solve the problems of non-fluorescent carbon nanoparticles with poor fluorescence performance and carbon quantum dots, and achieve the effects of short preparation cycle, uniform size distribution and good repeatability

Active Publication Date: 2014-07-16
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0005] At present, there are many methods for the preparation of carbon quantum dots, such as high temperature and high pressure excision method, candle burning method, and electrochemical scanning method, but usually non-fluorescent carbon nanoparticles or carbon quantum dots with poor fluorescence properties are prepared.

Method used

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  • Nitrogen-doped high-luminescent carbon quantum dot and preparation method thereof

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preparation example Construction

[0041] A preparation method of nitrogen-doped highly luminescent carbon quantum dots, comprising the following steps:

[0042] (1) With the sodium citrate solution of 0.2-1.0mol / L as carbon source, then add ethylenediamine solution, dissolve and obtain precursor solution, the volume ratio of described sodium citrate solution and described ethylenediamine solution is 100 :0.5-5;

[0043] (2) Place the precursor solution obtained in step (1) in a polytetrafluoroethylene-lined stainless steel autoclave, seal it and react at 100-300°C for 3 hours or more, and cool to room temperature to obtain a suspension;

[0044] (3) using a cylindrical membrane separation filter to separate the suspension obtained in step (2);

[0045] (4) vacuum drying the separated solution obtained in step (3) to obtain the nitrogen-doped highly luminescent carbon quantum dots.

[0046] The specific implementation and results are as follows.

Embodiment 1

[0048] (a) Take 25ml of 0.5mol / L sodium citrate solution, add 300 μL of ethylenediamine, and stir thoroughly for 5 minutes to obtain a precursor solution;

[0049] (b) Place the obtained precursor solution in a 50ml polytetrafluoroethylene-lined stainless steel autoclave, seal it and react at a temperature of 180°C for 6h, and cool it naturally to room temperature to obtain a suspension;

[0050] (c) Filter the suspension with a cylindrical membrane separation filter with a molecular weight cut-off of 3 kDa, collect the filtrate, and dry to obtain a nitrogen-doped carbon quantum dot with high photoluminescence intensity. The carbon quantum dots obtained in this example have a luminous intensity of 867a.u. under the irradiation of 450nm light.

[0051] See attached figure 1 , which is the transmission electron microscope image of the nitrogen-doped fluorescent carbon quantum dots prepared in this example, from figure 1 It can be seen that the lattice spacing is about 32nm, refl...

Embodiment 2

[0056] (a) Take 25ml of 0.5mol / L sodium citrate solution, add 600 μL of ethylenediamine, and stir thoroughly for 5 minutes to obtain a precursor solution;

[0057] (b) Place the obtained precursor solution in a 50ml polytetrafluoroethylene-lined stainless steel autoclave, seal it and react at a temperature of 180°C for 6h, and cool naturally to room temperature to obtain a suspension;

[0058] (c) Filter the suspension with a cylindrical membrane separation filter with a molecular weight cut-off of 3 kDa, collect the filtrate, and dry to obtain a nitrogen-doped carbon quantum dot with high photoluminescence intensity. The carbon quantum dots obtained in this example have a luminous intensity of 852a.u. under the irradiation of 450nm light.

[0059] See attached Figure 10 , which is the change curve of the luminous intensity of the nitrogen-doped fluorescent carbon quantum dots prepared in this example after being treated with hydrogen peroxide. The purpose of adding hydroge...

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Abstract

The invention provides a nitrogen-doped high-luminescent carbon quantum dot and a preparation method thereof. The preparation method comprises the following steps: reacting by using a sodium citrate solution as a carbon source and ethanediamine as a source of N under a sealing condition, cooling an obtained product, then separating, and drying a solution obtained after separation so as to obtain the nitrogen-doped high-luminescent carbon quantum dot. The preparation method is simple in process, short in preparation period, low in manufacturing cost and good in repeatability; obtained raw materials are simple and easily available. The nitrogen-doped high-luminescent carbon quantum dot prepared by using the method is uniform in size distribution and high in luminescent density; the luminescent density of the nitrogen-doped high-luminescent carbon quantum dot is about 20 times of that of a general quantum dot, so that the application of the nitrogen-doped high-luminescent carbon quantum dot in the field of cell marking can be expanded. As the improvement of the luminescent density is caused by nitrogen doping, the nitrogen-doped high-luminescent carbon quantum dot prepared by the method has unique application when being used for detecting whether N exists in environments.

Description

technical field [0001] The invention belongs to the field of nanomaterials, in particular to a nitrogen-doped high-luminescence carbon quantum dot and a preparation method thereof Background technique [0002] Quantum dots (quantumdots, QDs), also known as nanocrystals, are composed of a limited number of atoms, and the three dimensions are all on the order of nanometers. Quantum dots are generally spherical or quasi-spherical, and are nanoparticles composed of II-VI or III-V elements with a stable diameter of 2-20nm. Quantum dots are aggregates of atoms and molecules on the nanometer scale, which can be composed of a semiconductor material, such as group II and VI elements (such as CdS, CdSe, CdTe, ZnSe, etc.) or group III and V elements (such as InP , InAs, etc.), or two or more semiconductor materials, such as CdSe / CdS, CdSe / ZnSe, CdSe / ZnS, etc. [0003] As a novel semiconductor nanomaterial, quantum dots have many unique nanoscale properties. For example, quantum dots...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y30/00B82Y40/00
Inventor 徐泉刘啸
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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