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Method for synthesizing water phase of Mn<2+> doped CdS fluorescent quantum dots by stable acetopyruvic acid

A technology of acetylacetonate and fluorescent quantum dots, applied in chemical instruments and methods, luminescent materials, etc., to achieve the effect of low cost and simple method

Inactive Publication Date: 2013-04-17
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no Mn that uses AA as a stabilizer, thiourea as a sulfur source, synthesized by a hydrothermal method, and whose emission fluorescence can be reversibly regulated by redox reactions. 2+ :Related Chinese patent reports on CdS quantum dots

Method used

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  • Method for synthesizing water phase of Mn&lt;2+&gt; doped CdS fluorescent quantum dots by stable acetopyruvic acid
  • Method for synthesizing water phase of Mn&lt;2+&gt; doped CdS fluorescent quantum dots by stable acetopyruvic acid
  • Method for synthesizing water phase of Mn&lt;2+&gt; doped CdS fluorescent quantum dots by stable acetopyruvic acid

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Experimental program
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Effect test

Embodiment 1

[0026] First, add 0.1 mol of acetylacetonic acid to 50 mL of double-distilled water, raise the temperature to 80°C under magnetic stirring to completely dissolve it; then, add 0.1 mol of cadmium chloride and 0.1 mol of thiourea to make them fully dissolved to form a homogeneous Next, add 0.05mol manganese acetate to fully dissolve it to form a reaction solution system; then, place this solution system at 60°C for continuous reflux reaction for 3 hours; finally, cool the reaction solution to room temperature and centrifuge at high speed , The precipitate is washed with water, and then dispersed in water using ultrasound to prepare Mn 2+ Doped CdS quantum dot aqueous solution. Add 0.05mol potassium persulfate and 0.1mol sodium borohydride to this quantum dot solution first and then to investigate the reversible fluorescence behavior induced by the oxidation-reduction reaction.

[0027] Use (high resolution) transmission electron microscope to observe the morphology and size of the ...

Embodiment 2

[0029] First, add 0.2 mol of acetylacetonic acid to 50 mL of double distilled water, and heat to 80°C under magnetic stirring to completely dissolve; then, add 0.1 mol of cadmium acetate and 0.1 mol of thiourea to make them fully dissolved to form a homogeneous Mixed solution; Next, add 0.05mol manganese chloride to fully dissolve it to form a reaction solution system; then, place the solution system at 60°C for continuous reflux reaction for 4 hours; finally, cool the reaction solution to room temperature and centrifuge at high speed , The precipitate is washed with water, and then dispersed in water using ultrasound to prepare Mn 2+ Doped CdS quantum dot aqueous solution. Add 0.05mol potassium persulfate and 0.2mol sodium borohydride to this quantum dot solution first and then to investigate the reversible fluorescence behavior induced by the oxidation-reduction reaction. The performance characterization and fluorescence properties of the prepared product are the same as in E...

Embodiment 3

[0031] First, add 0.3 mol of acetylacetonic acid to 50 mL of double-distilled water, and heat to 80°C under magnetic stirring to completely dissolve it; then, add 0.1 mol of cadmium acetate and 0.2 mol of thiourea to make them fully dissolved to form a homogeneous Mix the solution; next, add 0.1 mol of manganese chloride to fully dissolve it to form a reaction solution system; then, place the solution system at 70°C for continuous reflux reaction for 4 hours; finally, cool the reaction solution to room temperature and centrifuge at high speed , The precipitate is washed with water, and then dispersed in water using ultrasound to prepare Mn 2+ Doped CdS quantum dot aqueous solution. To this quantum dot solution, 0.1 mol potassium persulfate and 0.2 mol sodium borohydride were added first and then to investigate the reversible fluorescence behavior induced by the oxidation-reduction reaction. The performance characterization and fluorescence properties of the prepared product are...

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Abstract

The invention relates to a method for synthesizing a water phase of Mn<2+> doped CdS fluorescent quantum dots by stable acetopyruvic acid. The method comprises the following steps: (1), adding acetopyruvic acid into redistilled water and heating to the temperature of 80 DEG C with magnetically stirring to sufficiently dissolve the acetopyruvic acid so as to form homogeneous solution; (2), adding inorganic cadmium salt and thiocarbamide into aqueous solution of the acetopyruvic acid to form homogeneous reaction solution; (3), adding aqueous solution of the inorganic cadmium into the reaction solution and performing the reflux reaction on the mixed solution for hours; and (4), cooling to the room temperature, carrying out high speed centrifugation, washing precipitates with water and then dispersing the precipitates in water by ultrasound to prepare aqueous solution of the Mn<2+> doped CdS fluorescent quantum dots. Compared with the prior art, the method disclosed by the invention is simple, rapid and convenient to operate and is low in cost; and the prepared product has a fluorescent property capable of being reversibly regulated by redox reaction and can be developed into a potential fluorescence indicator, is used for biochemical analysis, living imaging of cells and tissues and fluorescent detection of redox reaction and provides a novel development direction for research in the fields of biological detection, chemical analysis and the like.

Description

Technical field [0001] The invention belongs to the technical field of fluorescent nanomaterial preparation, and specifically relates to acetylacetonate stabilized Mn 2+ Aqueous synthesis method of doped CdS fluorescent quantum dots. Background technique [0002] Manganese doped quantum dots refer to the doping of manganese ions (Mn 2+ ), in order to improve its optical, electrical and magnetic properties, it is a new type of semiconductor nanomaterial developed in recent years. The d electronic state of the manganese ion strongly interacts with the s and p electronic excited states of the nanocrystal. When the peripheral electrons are excited to transition to the nanocrystal, it can emit orange fluorescence. Compared with traditional quantum dots, manganese doped quantum dots have lower toxicity and can maintain excellent photochemical stability and luminous efficiency in light, heat and air. [0003] In view of the above special properties, manganese ion doped quantum dots have ...

Claims

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Application Information

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IPC IPC(8): C09K11/57
Inventor 万锕俊桂日军李慧丽金辉
Owner SHANGHAI JIAO TONG UNIV
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