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Sulfur quantum dot with fluorescence characteristic, preparation method and applications thereof

A technology with fluorescent properties and sulfur quantum, which is applied in the field of nanomaterials to achieve good water solubility

Active Publication Date: 2018-07-13
星紫(上海)新材料技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, so far, there has been no report on the synthesis of nano-sulfur with fluorescent properties, especially the synthesis of sulfur quantum dots with good fluorescence properties, good water solubility, good dispersion, and good stability.

Method used

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  • Sulfur quantum dot with fluorescence characteristic, preparation method and applications thereof
  • Sulfur quantum dot with fluorescence characteristic, preparation method and applications thereof
  • Sulfur quantum dot with fluorescence characteristic, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0043] Embodiment 2: A kind of preparation method of the sulfur quantum dot with fluorescence characteristic, comprises the following steps:

[0044] 1) Under normal temperature and pressure, add dispersant and water to the sulfur powder, stir and mix evenly, the molar ratio of sulfur powder to dispersant is (21-0.03):1;

[0045] 2) Heating the mixture in step 1) at a heating temperature of 6°C-150°C. While heating, add solid alkali granules or dropwise alkali solution evenly and slowly in about 1h while heating. The molar ratio of sulfur powder to alkali is (1- 0.003): 1 range; with the difference of heating time, the solution color gradually becomes lighter from deep red orange to light yellow.

[0046] 3) Heating and stirring under reflux for 15h-150h.

[0047] 4) Perform purification methods such as centrifugation or dialysis on the product of step 3 to obtain the sulfur quantum dot sol.

Embodiment 3-22

[0049]

Embodiment 23

[0050] Embodiment 23: A preparation method of sulfur quantum dots with fluorescent properties, comprising the following steps: 1) placing the mixed solution of sulfur powder, dispersant, water and solid alkali particles or alkali solution in the polytetrafluoroethylene liner In the reaction kettle, the molar ratio of sulfur powder to dispersant is 5.5:1; the molar ratio of sulfur powder to alkali is 0.44:1; 2) the reaction kettle is heated at 180°C for two hours; 3) the product of step 2) Purification is carried out to obtain the sulfur quantum dot sol.

[0051] like figure 2As shown, the fluorescence diagrams of the nano-sulfur quantum dots prepared in Example 5 at 380nm, 400nm, and 420nm excitation wavelengths; the inner inserts are photos under the corresponding fluorescent lamp and ultraviolet lamp. It can be seen that the maximum fluorescence emission peak of the synthesized sulfur quantum dots is at 500nm at excitation wavelengths of 380nm, 400nm and 420nm. Sulfur qua...

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Abstract

The invention relates to a sulfur quantum dot with fluorescence characteristic, a preparation method and applications thereof, wherein the sulfur quantum dot has a spherical structure, and sequentially comprises a core, an adsorption layer and a coating layer from inside to outside, the core is a sulfur nanometer core, the adsorption layer is a variety of sulfur ions, the coating layer is formed by a dispersing agent, and the particle size is 2-25 nm. In the prior art, the existing sulfur quantum dots are not fluorescent. According to the present invention, the nanometer sulfur sol prepared through the method has advantages of good water solubility, good fluorescence and good stability.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a structure, a preparation method and a control method of sulfur quantum dots with fluorescence characteristics. The nanometer sulfur quantum dots have strong fluorescence, good stability and can be dissolved in water. Background technique [0002] At present, due to the excellent properties of nanomaterials, which have attracted considerable attention, the fluorescent semiconductor quantum dots of nanomaterials generate various exciting application prospects, especially their applications in biology and medicine. However, the search for superior nanomaterials with similar optical properties continues, since the known toxicity and potential environmental hazards of many materials have largely restricted the development of these materials when used in vitro and in vivo. Currently, quantum-sized silicon, gold nanoclusters, and carbon nanodot-based studies attract exte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/56B82Y20/00B82Y30/00G01N21/64
CPCB82Y20/00B82Y30/00C09K11/025C09K11/56G01N21/6428
Inventor 申丽华刘圣楠
Owner 星紫(上海)新材料技术开发有限公司
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