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Microwave assistant method for quickly synthesizing quanta point of zinc selenide fluorescence

A fluorescent quantum dot, microwave-assisted technology, applied in chemical instruments and methods, luminescent materials, etc., to achieve the effect of mild conditions, low cost, and fast synthesis speed

Inactive Publication Date: 2005-10-26
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 address the defects of the current method for synthesizing ZnSe quantum dots, and propose a microwave-assisted synthesis method for ZnSe quantum dots, which has the advantages of fast synthesis speed, mild synthesis conditions and high quantum yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1). Preparation of sodium selenium hydride

[0015] 0.8 g of sodium borohydride (NaBH 4 ) solid and 1.32 grams of selenium powder (Se) were put into a small flask, and 20 milliliters of water were added. After reacting at 25 degrees Celsius for 8 hours, the reaction generates sodium selenium hydride, and the solution is taken out for later use.

[0016] (2).Microwave synthesis of ZnSe quantum dots

[0017] With water as solvent, 20 mmol / L zinc chloride (ZnCl 2 ) and 20 mmol / L mercaptopropionic acid (MPA) were mixed in an equal volume ratio, and the pH value was adjusted to 11. Then inject NaHSe solution to a concentration of 3 mmol / L, and stir at 25 degrees Celsius for 5 minutes to obtain a ZnSe precursor solution. The solution is placed in a closed polytetrafluoroethylene tank, and heated in a temperature-controllable and pressure-controllable microwave reactor according to the following conditions to obtain fluorescent quantum dots.

[0018] The microwave heatin...

Embodiment 2

[0024] 1). Preparation of potassium selenide

[0025] 0.8 g potassium borohydride (KBH 4 ) solid and 1.32 grams of selenium powder (Se) were put into a small flask, and 20 milliliters of water were added. After reacting at 25 degrees centigrade for 8 hours, the reaction generates potassium hydride selenide (KHSe), and the solution is taken out for later use.

[0026] (2).Microwave synthesis of ZnSe quantum dots

[0027] With water as solvent, 10 mmol / L ZnCl 2 Mix with 40 mmol / L mercaptopropionic acid in an equal volume ratio, and adjust the pH value to 8. Then, potassium selenide solution was injected to a concentration of 2 mmol / L, and stirred at 25 degrees Celsius for 5 minutes to obtain a ZnSe precursor solution. The solution is placed in a closed polytetrafluoroethylene tank, and heated in a temperature-controllable and pressure-controllable microwave reactor according to the following conditions to obtain fluorescent quantum dots.

[0028] The microwave heating condi...

Embodiment 3

[0034] (1). Sodium Selenium Hydride is prepared the same as Example 1.

[0035] (2).Microwave synthesis of ZnSe quantum dots

[0036] With water as solvent, 1.2 mmol / L ZnCl 2 Mix with 1 mmol / L mercaptopropionic acid in an equal volume ratio, and adjust the pH value to 9. Then inject sodium selenide to a concentration of 0.2 mmol / L, and stir at 25 degrees Celsius for 5 minutes to obtain a ZnSe precursor solution. The solution is placed in a closed polytetrafluoroethylene tank, and heated in a temperature-controllable and pressure-controllable microwave reactor according to the following conditions to obtain fluorescent quantum dots.

[0037] The microwave heating conditions are:

[0038] Microwave oscillation frequency: 2450MHZ

[0039] Microwave power: 600W,

[0040] Heating time: 1 hour

[0041] Heating temperature: 180 degrees Celsius.

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Abstract

The present invention relates to a method for microwave-aided quickly synthesizing zinc selenide fluorescence quantum point. Said method uses water as solvent, and adopts the following steps: mixing zinc salt or zinc oxide and water-soluble mercaptocompound, injecting soduim hydrogen selenide or potassium hydrogen selenide produced by adopting sodium borohydride or potassium borohydride and zinc powder and making them produce reaction to obtain zinc solenide ZnSe precursor solution, then placing said solution in a closed teflon tank and making reaction in a temperature-controllable and pressure-controllable microwave reactor so as to quickly synthesize ZnSe fluorescence quantum point.

Description

technical field [0001] The invention relates to a microwave-assisted method for rapidly synthesizing zinc selenide (ZnSe) fluorescent quantum dots, which uses zinc salt (or its oxide, hydroxide) and sodium selenium hydride (or potassium selenium hydride, selenium powder) as raw materials The invention relates to a technology for rapidly preparing ZnSe fluorescent quantum dots by using temperature-controllable microwave assistance, which belongs to the field of nanomaterial preparation technology and biological analysis and detection technology. Background technique [0002] Quantum dots, also known as semiconductor nanocrystals, are nanoparticles composed of group II-VI or group III-V elements, and ZnSe belongs to one of them. Compared with organic fluorescent dyes, this material has unique photoluminescent properties, such as wide excitation wavelength range, narrow emission wavelength range, large Stokes shift, high quantum yield, long fluorescence lifetime, and is not eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/54
Inventor 任吉存钱惠锋
Owner SHANGHAI JIAO TONG UNIV
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