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Sulfur/nitrogen double-doped carbon quantum dot with high fluorescence quantum yield and preparation method and application of sulfur/nitrogen double-doped carbon quantum dot

A technology of carbon quantum dots and double doping, which is applied in the field of nanomaterials to achieve the effects of low cost, high luminous intensity, and less intermediate products

Active Publication Date: 2015-06-24
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the doped carbon quantum dots, the current research mainly focuses on carbon quantum dots doped with sulfur and nitrogen single-atom elements, while the preparation, properties and applications of carbon quantum dots doped with a single raw material are more important. rarely reported

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  • Sulfur/nitrogen double-doped carbon quantum dot with high fluorescence quantum yield and preparation method and application of sulfur/nitrogen double-doped carbon quantum dot
  • Sulfur/nitrogen double-doped carbon quantum dot with high fluorescence quantum yield and preparation method and application of sulfur/nitrogen double-doped carbon quantum dot
  • Sulfur/nitrogen double-doped carbon quantum dot with high fluorescence quantum yield and preparation method and application of sulfur/nitrogen double-doped carbon quantum dot

Examples

Experimental program
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Effect test

Embodiment 1

[0048] (a) Take 0.735g of sodium citrate and 0.48g of sulfamide, dissolve in 25mL of deionized water and stir for 5min 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 200°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 sulfur and nitrogen double-doped carbon quantum dots with high fluorescence yield.

[0051] see figure 1 , which is the transmission electron microscope image of the sulfur and nitrogen double-doped fluorescent carbon quantum dots prepared in this example, from figure 1 It can be seen that the size of carbon quantum dots is between 3nm and 9nm.

[0052] see figure 2 , which is the fluorescence emission and fluorescence excitation spec...

Embodiment 2

[0055] (a) Take 0.735g of sodium citrate and 0.24g of sulfamide, dissolve in 25mL of deionized water and stir for 5min to obtain a precursor solution;

[0056] (b) Place the obtained precursor solution in a 50mL polytetrafluoroethylene-lined stainless steel autoclave, seal it and react at 220°C for 4h, and cool it naturally to room temperature to obtain a suspension;

[0057] (c) Filtrating the suspension with a 3kDa molecular weight cut-off cylindrical membrane separation filter, collecting the filtrate, and drying to obtain sulfur and nitrogen double-doped carbon quantum dots with high fluorescence yield. The carbon quantum dots obtained in this example have a luminous intensity of 624a.u. under the irradiation of 350nm light.

[0058] see Figure 7 , which is the change curve of the luminous intensity of the sulfur and nitrogen double-doped fluorescent carbon quantum dots prepared in this example after being treated with hydrogen peroxide. The results show that the prepare...

Embodiment 3

[0060] (a) Take 0.735g of sodium citrate and 0.024g of sulfamide, dissolve in 25mL of deionized water and stir for 5min to obtain a precursor solution;

[0061] (b) Place the obtained precursor solution in a 50mL polytetrafluoroethylene-lined stainless steel autoclave, react at 180°C under sealed conditions for 8h, and naturally cool to room temperature to obtain a suspension;

[0062] (c) Filtrating the suspension with a cylindrical membrane separation filter with a molecular weight cut-off of 5kDa, collecting the filtrate, and drying to obtain a sulfur-doped carbon quantum dot with a high fluorescence yield. The carbon quantum dots obtained in this example have a luminous intensity of 830a.u. under the irradiation of 450nm light.

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Abstract

The invention provides a sulfur / nitrogen double-doped carbon quantum dot with high fluorescence quantum yield and a preparation method and ion detection application of the sulfur / nitrogen double-doped carbon quantum dot. The carbon source of the carbon quantum dot is provided from sodium citrate, and the sulfur source and the nitrogen source of the carbon quantum dot are both provided from sulfamide. The reparation method comprises the following steps: dissolving the raw materials in a hydrothermal reaction kettle for reaction, after the synthesized product is naturally cooled, separating so as to obtain a solution, and drying the solution, thereby obtaining the sulfur / nitrogen double-doped carbon quantum dot with high fluorescence quantum yield. By adopting the method, only one step of reaction is needed, a small amount of middle products and byproducts can be generated, a very small amount of raw materials is needed, the reaction speed is fast, and the method is both economic and environment-friendly. In addition, the sulfur / nitrogen double-doped carbon quantum dot has the characteristics of high fluorescence quantum yield, can be successfully applied to detection on Hg<2+>, and has wide application prospect in biological detection, sewage treatment and the like.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and relates to a sulfur-nitrogen double-doped carbon quantum dot, a preparation method and its application, in particular to a sulfur-nitrogen double-doped carbon quantum dot with high fluorescence quantum yield, a preparation method and its use. Background technique [0002] Carbon is the basis of all known life on Earth and has played a pivotal role in the development of modern technology. Carbon has a variety of electronic orbital characteristics (sp, sp2 and sp3), so it forms many substances with peculiar structures and properties, such as carbon nanotubes, fullerenes, nanodiamonds, graphene and graphene oxide. In recent years, the development of nano-carbon materials has continuously refreshed achievements. In 2004, Scrivens and others accidentally isolated carbon quantum dots when purifying single-walled carbon nanotubes prepared by arc discharge method for the first time, which once again ope...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y20/00B82Y30/00G01N21/64
Inventor 徐泉周红军周颖刘瑶
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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