Aqueous phase synthesis for high quality cadmium selenide quantum dots in temperature controlled microwave reactor

A technology of cadmium selenide and quantum dots, applied in chemical instruments and methods, binary selenium/tellurium compounds, cadmium compounds, etc., to achieve the effects of mild conditions, simple operation and high fluorescence quantum yield

Inactive Publication Date: 2005-01-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new method for synthesizing cadmium selenide quantum dots in the water phase for the defects of the current water phase and organic phase synthesis methods, which has the advantages of simple synthesis steps, fast synthesis speed, mild synthesis conditions, and good water solubility of the product , adjustable emission spectrum, and high quantum yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1). Preparation of sodium selenium hydride

[0016] Put 0.8 g of sodium borohydride solid and 0.8 g of selenium powder into a small flask, and add 10 ml of water. After reacting at 25 degrees Celsius for 2 hours, the solution was taken out and set aside.

[0017] (2). Synthesis of CdSe quantum dots in water phase by microwave heating

[0018] Using water as a solvent, mix 20 mmol / L cadmium chloride and 20 mmol / L mercaptopropionic acid in an equal volume ratio, and adjust the pH value to 11. Then inject a sodium selenide solution to a concentration of 1 mmol / L, and stir at 25 degrees Celsius for 5 minutes to obtain a CdSe precursor solution. The solution is placed in a closed polytetrafluoroethylene tank, and heated in a temperature-controllable microwave reactor according to the following conditions to obtain CdSe fluorescent quantum dots.

[0019] The microwave heating conditions are:

[0020] Microwave oscillation frequency: 2450MHZ

[0021] Microwave power: 400...

Embodiment 2

[0025] (1). Preparation of potassium selenide

[0026] Put 0.9 gram of sodium borohydride solid and 0.9 gram of selenium powder into a small flask, and add 20 milliliters of water. After reacting at 25 degrees Celsius for 2 hours, the solution was taken out and set aside.

[0027] (2). Synthesis of CdSe quantum dots in water phase by microwave heating

[0028] Using water as a solvent, mix 8 mmol / L cadmium chloride and 12 mmol / L mercaptopropionic acid in an equal volume ratio, and adjust the pH value to 7. Potassium selenide was then injected to a concentration of 0.4 mmol / L and stirred for 10 minutes to obtain a CdSe precursor solution. The solution is placed in a closed polytetrafluoroethylene tank, and heated in a temperature-controllable microwave reactor according to the following conditions to obtain CdSe fluorescent quantum dots.

[0029] The microwave heating conditions are:

[0030] Microwave oscillation frequency: 2450MHZ

[0031] Microwave power: 600W

[0032]...

Embodiment 3

[0035] (1). The preparation of sodium selenium hydride is the same as in Example 1.

[0036] (2). Synthesis of CdSe quantum dots in water phase by microwave heating

[0037] Using water as a solvent, mix 1.2 mmol / L cadmium chloride and 1 mmol / L mercaptopropionic acid in an equal volume ratio, and adjust the pH value to 9. Then sodium selenide was injected to a concentration of 0.2 mmol / L, and stirred at 25° C. for 5 minutes to obtain a CdSe precursor solution. The solution is placed in a closed polytetrafluoroethylene tank, and heated in a temperature-controllable microwave reactor according to the following conditions to obtain CdSe fluorescent quantum dots.

[0038] The microwave heating conditions are:

[0039] Microwave oscillation frequency: 2450MHZ

[0040] Microwave power: 600W,

[0041] Heating time: 0.5 hours

[0042] Heating temperature: 180 degrees Celsius.

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Abstract

The invention discloses an aqueous phase synthesis for high quality cadmium selenide quantum dots in temperature controlled microwave reactor by using water as solvent, mixing cadmium salt or cadmium oxide with water-soluble mercapto compounds, reacting sodium borohydride or potassium borohydride with selenium powder, obtaining cadmium selenide precursor solution, placing the solution in air-tight polytetrafluoroethylene tank, reacting in temperature controlled microwave reactor, thus rapidly synthesizing cadmium selenide fluorescent light quantum dots.

Description

technical field [0001] The invention relates to a temperature-controlled microwave aqueous phase synthesis method of high-quality cadmium selenide (CdSe) quantum dots. The water phase prepares CdSe quantum dots through a temperature-controllable microwave heating method, and belongs to the field of nanometer material preparation technology and biological analysis and detection technology. Background technique [0002] CdSe quantum dots, also known as CdSe nanocrystals, are a kind of luminescent material with excellent performance. Compared with organic fluorescent dyes, it has unique photoluminescent properties, such as wide excitation wavelength range, narrow emission wavelength range, large Stocks shift, high quantum yield, long fluorescence lifetime, and is not easy to photolysis or Drifting and other characteristics. It has broad application prospects in the preparation of optoelectronic devices and the field of life sciences. At present, people have connected CdSe qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04C01G11/00C09K11/54C09K11/88
Inventor 任吉存钱惠锋李良
Owner SHANGHAI JIAO TONG UNIV
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