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Sulfur doped carbon quantum dot with high fluorescent quantum yield, and preparation method and application thereof

A technology of fluorescence quantum yield and carbon quantum dots, which is applied in the direction of fluorescence/phosphorescence, chemical instruments and methods, luminescent materials, etc., to achieve the effects of high yield, high luminous intensity, and fast reaction speed

Active Publication Date: 2015-01-28
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In doped carbon quantum dots, the current research mainly focuses on nitrogen-doped carbon quantum dots, while the preparation, properties and applications of carbon quantum dots doped with other heteroatoms are rarely reported.

Method used

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  • Sulfur doped carbon quantum dot with high fluorescent quantum yield, and preparation method and application thereof
  • Sulfur doped carbon quantum dot with high fluorescent quantum yield, and preparation method and application thereof
  • Sulfur doped carbon quantum dot with high fluorescent quantum yield, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (a) Take 0.735g of sodium citrate and 1.86g of sodium thiosulfate, dissolve them in 25mL of deionized water and stir for 5 minutes to obtain a precursor solution;

[0046] (b) Place the obtained precursor solution in a 50ml polytetrafluoroethylene-lined stainless steel autoclave, seal it and react at a temperature of 240°C for 3h, and cool it naturally to room temperature to obtain a suspension;

[0047] (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-doped carbon quantum dots with a high fluorescence yield.

[0048] see figure 1 , which is the transmission electron micrograph of the sulfur-doped fluorescent carbon quantum dots prepared in this example, from figure 1 The test shows that the lattice spacing is about 0.32nm, reflecting the (002) crystal plane of graphite.

[0049] see figure 2 , which is the atomic force microscopy spectrum of the sulfur-do...

Embodiment 2

[0054] (a) Take 0.735g of sodium citrate and 1.24g of sodium thiosulfate, dissolve them in 25mL of deionized water and stir for 5min to obtain a precursor solution;

[0055] (b) Place the obtained precursor solution in a 50mL polytetrafluoroethylene-lined stainless steel autoclave, seal and react at 200°C for 6h, and cool naturally to room temperature to obtain a suspension;

[0056] (c) Filtrating the suspension with a cylindrical membrane separation filter with a molecular weight cut-off of 3 kDa, collecting the filtrate, and drying to obtain sulfur-doped carbon quantum dots with a high fluorescence yield. The carbon quantum dots obtained in this example have a luminous intensity of 722a.u. under the irradiation of 350nm light.

[0057] see Figure 8 , which is the change curve of the luminous intensity of the sulfur-doped fluorescent carbon quantum dots prepared in this example after being treated with hydrogen peroxide. By adding hydrogen peroxide to change the number of...

Embodiment 3

[0060] (a) Take 0.735g of sodium citrate and 0.62g of sodium thiosulfate, dissolve them in 25mL of deionized water and stir for 5 minutes to obtain a precursor solution;

[0061] (b) Place the obtained precursor solution in a 50mL polytetrafluoroethylene-lined stainless steel autoclave, react at 140°C under sealed conditions for 6h, 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 260a.u. under the irradiation of 450nm light.

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Abstract

The invention provides a sulfur doped carbon quantum dot with high fluorescent quantum yield, and a preparation method and application thereof. The invention respectively uses sodium citrate as a carbon source and sodium thiosulfate as a sulfur source, which are dissolved in a hydrothermal reaction kettle for reaction; the obtained product is naturally cooled and isolated to obtain a solution; after drying of the solution, the sulfur doped carbon quantum dot with high fluorescent quantum yield is obtained. The method only needs one step reaction, not only has low cost and high reaction speed, but also has a few by-products and intermediate products. The obtained carbon quantum dot has the characteristic of high fluorescent quantum yield, and can be successfully applied to the detection of Fe<3+>, and also has broad application prospects in biological detection and sewage disposal.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a sulfur-doped carbon quantum dot, a preparation method and its application, in particular to a sulfur-doped carbon quantum dot with high fluorescence quantum yield, a preparation method and its application. Background technique [0002] 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 2004, Scrivens and others accidentally separated carbon quantum dots when purifying single-walled carbon nanotubes prepared by arc discharge method, opening up a new era of new fluorescent sensitive materials. [0003] Luminescent carbon quantum dots (Carbon dots, CDs) are spherical nanoparticles with a size of less than 10nm with carbon as the skeleton structure. They not only have the optical properties of traditional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65G01N21/64
Inventor 徐泉赵骏刚徐泓周红军
Owner CHINA UNIV OF PETROLEUM (BEIJING)