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Sulfur quantum dot and preparation method and application thereof

A technology of sulfur quantum and sulfur powder, which is applied in the field of sulfur quantum dots and its preparation, can solve the problems of low product quantum yield, long time consumption of sulfur quantum dots, complicated operation steps, etc. The effect of the application foreground

Active Publication Date: 2020-01-31
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Description
  • Claims
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Problems solved by technology

[0005] Based on the defects in the prior art, the purpose of the present invention is to provide a preparation method and application of sulfur quantum dots. The raw materials of the preparation method are easy to obtain, the price is low, the preparation method is simple, and the threshold for research on sulfur quantum dots is lowered, which can solve the problem of The preparation of sulfur quantum dots in the prior art takes a long time, the operation steps are cumbersome, and the quantum yield of the product is low; the purpose of the present invention is also to provide the sulfur quantum dots prepared by the preparation method, and the obtained product has excellent fluorescence properties; the present invention The purpose is also 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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  • Sulfur quantum dot and preparation method and application thereof
  • Sulfur quantum dot and preparation method and application thereof
  • Sulfur quantum dot and preparation method and application thereof

Examples

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Embodiment 1

[0048] The embodiment of the present invention provides a method for preparing sulfur quantum dots, comprising the following steps:

[0049] (1) At room temperature, mix 20mg sublimated sulfur powder, 0.5mL PEG-400 and 14.5mL 10%wt H 2 o 2 Place in a clean beaker, and ultrasonically treat for about 10 minutes;

[0050] (2) Put the above-mentioned homogeneously dispersed mixed liquid in a polytetrafluoroethylene high-pressure reactor, and start the reaction time of about 18 hours, and the heating reaction at a temperature within the range of 150-220°C. After the reaction, it was naturally cooled to room temperature.

[0051] (3) Neutralize the reaction solution with an alkaline solution, perform centrifugation, and take the supernatant. In order to obtain pure sulfur quantum dots with uniform size distribution and removal of impurities such as unreacted raw materials, the centrifuged supernatant is filtered through a microporous membrane three times or placed in a dialysis b...

Embodiment 2

[0064] The sulfur quantum dots prepared in Example 1 were subjected to surface modification treatment. The specific method is:

[0065] Add 1-10 mg of sodium borohydride to 10-100 mL of the sulfur quantum dot solution under ice-bath conditions, and stir the mixture at room temperature. After 2-4 hours of surface modification, neutralization, centrifugation, purification and concentration are performed.

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Abstract

The invention provides a sulfur quantum dot as well as a preparation method and application thereof. The preparation method comprises the following steps: adding sulfur powder into a dispersion systemfor ultrasonic treatment to obtain dispersion liquid; wherein the dispersion system comprises polyethylene glycol and hydrogen peroxide; transferring the dispersion liquid into a reaction kettle forsolvothermal reaction; and after the reaction is finished, naturally cooling to room temperature and adjusting the pH value to be neutral to obtain the sulfur quantum dot. The sulfur quantum dot prepared by the method is high in yield, rich in surface functional groups, relatively small in size, relatively uniform in particle size distribution, good in water solubility, good in dispersity, good inbiocompatibility 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 sulfur quantum dot and its preparation method and application. 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 quick preparation methods, high q...

Claims

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Application Information

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IPC IPC(8): C09K11/56H01L33/50B82Y20/00B82Y40/00G01N21/64A61K41/00
CPCA61K41/0052A61K41/0057B82Y20/00B82Y40/00C09K11/56G01N21/64H01L33/502
Inventor 王春霞潘彩文魏紫彤
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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