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Boron-nitrogen co-doped sulfur quantum dots as well as preparation method and application thereof

A sulfur quantum and co-doping technology, which is applied in the field of nanomaterials, can solve the problems of low quantum yield of products, long time-consuming sulfur quantum dots, cumbersome operation steps, etc., and achieve stable fluorescence, good fluorescence characteristics, and good dispersion.

Active Publication Date: 2021-10-22
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on the defects existing in the prior art, the first object of the present invention is to provide a method for preparing boron-nitrogen co-doped sulfur quantum dots. The technical preparation of sulfur quantum dots takes a long time, the operation steps are cumbersome, the product quantum yield is low, and the wavelength is short; the second purpose of the present invention is to provide the sulfur quantum dots prepared by the preparation method, and the obtained sulfur quantum dots have fluorescence Excellent performance; the third purpose of the present invention is to provide the application of the sulfur quantum dots as light-emitting materials in the fields of biological imaging, ion detection, fluorescent probes, photodynamic therapy, photothermal therapy, functional devices, photoelectric materials and photocatalytic materials

Method used

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  • Boron-nitrogen co-doped sulfur quantum dots as well as preparation method and application thereof
  • Boron-nitrogen co-doped sulfur quantum dots as well as preparation method and application thereof
  • Boron-nitrogen co-doped sulfur quantum dots as well as preparation method and application thereof

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Embodiment 1

[0045] This embodiment provides a method for preparing boron-nitrogen co-doped sulfur quantum dots, comprising the following steps:

[0046] (1) At room temperature, put 10 mg of sublimed sulfur powder, 10 mg of boric acid, and 90 wt % formamide solution (10.27 mg of formamide) in a clean beaker, and ultrasonically treat it for 10 min to uniformly disperse it to obtain a dispersion.

[0047] (2) Put the uniformly dispersed dispersion liquid in a polytetrafluoroethylene autoclave for solvothermal reaction, the temperature of the heating reaction is 180° C., and the reaction time is 10 h; after the reaction is completed, it is naturally cooled to room temperature.

[0048] (3) Centrifuge the naturally cooled sample, the speed of the centrifuge is 10000r / min, the centrifugation time is 10min, and the obtained centrifuge supernatant is filtered three times through a 0.45μm microporous membrane or placed in a dialysis bag of 1000Da for 120h. . The filtrate or dialysate is placed i...

Embodiment 2

[0059] In this example, the surface modification treatment is carried out on the boron-nitrogen co-doped sulfur quantum dots prepared in Example 1. The specific method is:

[0060] Take 3 mg of boron-nitrogen co-doped sulfur quantum dots obtained in Example 1, add 1.5 mL of hydrogen peroxide solution with a concentration of 30%, stir at room temperature, and perform centrifugal purification and concentration after the surface modification time is 3 h.

[0061] Figure 4 It is the fluorescence spectrum of the boron-nitrogen co-doped sulfur quantum dot surface modification treatment in Example 1 of the present invention.

[0062] Depend on Figure 4 Compared figure 1 It can be seen that the fluorescence intensity of the boron-nitrogen co-doped sulfur quantum dots modified by hydrogen peroxide is enhanced, the position of the absorption peak is changed, and the position of the maximum emission peak is blue-shifted by about 40nm.

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Abstract

The invention provides boron-nitrogen co-doped sulfur quantum dots as well as a preparation method and application thereof. The preparation method comprises the steps: adding a sulfur source and boric acid into a nitrogen source dispersion system, and carrying out ultrasonic treatment to obtain a dispersion liquid; transferring the dispersion liquid into a reaction kettle for solvothermal reaction; and after the reaction is finished, naturally cooling to room temperature, carrying out centrifugal purification treatment, and drying to obtain the sulfur quantum dots. The sulfur quantum dots prepared by the method are relatively long in wavelength, high in yield, rich in surface functional groups, relatively small in size, relatively uniform in particle size distribution, good in dispersity, good in biocompatibility and excellent in fluorescence property, and can be widely applied to the fields of cell imaging, ion detection and the like.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and relates to a boron-nitrogen co-doped sulfur quantum dot and a preparation method and application thereof. Background technique [0002] Sulfur is one of the most abundant elements on Earth and has been mined for thousands of years for a variety of purposes. Sulfur quantum dots are a kind of spherical fluorescent sulfur nanoparticles dispersed in nanometer scale. Sulfur quantum dots prepared from sulfur powder exhibit good electrochemical and chemiluminescent properties such as strong fluorescence intensity, anti-photobleaching / flickering, and low toxicity. They can be widely used in various fields as luminescent, conductive, and thermally conductive materials. [0003] However, currently limited by production technology and means, the research is relatively unfocused. Therefore, cheap, easy-to-obtain, safe and environmentally friendly raw materials for production, simple and qui...

Claims

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Application Information

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IPC IPC(8): C09K11/63B82Y20/00B82Y30/00B82Y40/00G01N21/64H01L33/50
CPCC09K11/63B82Y20/00B82Y30/00B82Y40/00H01L33/504G01N21/643G01N21/6428
Inventor 王春霞黄国勇魏紫彤
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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