Prepn. process of ZnSe/ZnS kernel/shell type quantum points

A quantum dot and water-soluble technology, which is applied in the field of nanomaterials and biological analysis and detection, can solve the problems of a large number of non-radiation recombination centers, affect the performance of quantum dots, and be easily oxidized, and achieve the effect of safe raw materials, good water solubility, and low toxicity

Inactive Publication Date: 2006-09-20
FUDAN UNIV
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  • Summary
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  • Application Information

AI Technical Summary

Benefits of technology

This technology allows for creating small particles with specific colors that are stable when dissolved or dispersed into liquids like blood. These tiny crystals emit light at different wavelengths depending on their composition but they all look similar because it's made from pure elements such as zinc selenide. They also contain other chemical substances added during synthesis which makes them more durable than traditional organic molecules.

Problems solved by technology

Technologies related to this patented technical problem addressed in the patents include developing stable aqueous solubilized quantum dye molecules that emit light efficiently at different colors due to changes caused by factors like pH value, concentration ratio, crystal shape, charge state, energy levels, and chemical bond strength between them. Additionally, there may exist multiple methods for producing these quantum dot particles without contaminants during synthesis process.

Method used

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  • Prepn. process of ZnSe/ZnS kernel/shell type quantum points
  • Prepn. process of ZnSe/ZnS kernel/shell type quantum points

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1)Na 2 SeSO 3 preparation

[0019] Take 3.94g Na 2 SO 3 and 49.4mg of Se powder, placed in a 100ml single-necked flask, added 50ml of pure water, heated to 90°C under nitrogen protection, and reacted for 35 hours to obtain Na 2 SeSO 3 solution.

[0020] (2) Preparation of ZnSe precursor solution

[0021] 17.2 mg ZnCl 2 Dissolve in 100 ml of water, add 8.6 μl of thioglycolic acid, adjust pH=6.5 with 0.5 mol / L NaOH solution, inject 2 ml of NaOH 2 SeSO 3 solution, as a ZnSe precursor solution;

[0022] (3) Program controlled microwave irradiation to prepare ZnSe quantum dots

[0023] The obtained ZnSe precursor solution is subjected to program-controlled microwave radiation to obtain ZnSe quantum dots. The program control conditions are as follows:

[0024] The first program microwave power: 50W; the first program temperature: 80°C; the first program time: 30s;

[0025] Second program microwave power: 80W; second program temperature: 90°C; second program time...

Embodiment 2

[0029] (1)Na 2 SeSO 3 preparation

[0030] Take 1.5g Na 2 SO 3 and 21.5mg of Se powder, placed in a 25ml single-necked flask, added 15ml of pure water, heated to 100°C under nitrogen protection, and reacted for 20 hours to obtain Na 2 SeSO 3 solution.

[0031] (2) Preparation of ZnSe precursor solution

[0032] 25.2 mg ZnCl 2 Dissolve in 100 ml of water, add 11.2 μl of mercaptoacetic acid, adjust pH=5.4 with 0.5 mol / L NaOH solution, inject 3 ml of NaOH 2 SeSO 3 solution, as a ZnSe precursor solution;

[0033] (3) Program controlled microwave irradiation to prepare ZnSe quantum dots

[0034] The obtained ZnSe precursor solution is subjected to program-controlled microwave radiation to obtain ZnSe quantum dots. The program control conditions are as follows:

[0035] The first program microwave power: 70W; the first program temperature: 75°C; the first program time: 60s;

[0036] Second program microwave power: 200W; second program temperature: 110°C; second program ...

Embodiment 3

[0040] (1)Na 2 SeSO 3 preparation

[0041] Take 0.6g Na 2 SO 3 and 10.5mg of Se powder, placed in a 100ml single-necked flask, added 50ml of pure water, heated to 80°C under nitrogen protection, and reacted for 35 hours to obtain Na 2 SeSO 3 solution.

[0042] (2) Preparation of ZnSe precursor solution

[0043] 36.5 mg ZnCl 2 Dissolve in 100 ml of water, add 12.7 μl of thioglycolic acid, adjust pH=7.5 with 0.5 mol / L NaOH solution, inject 5 ml of NaOH 2 SeSO 3 solution, as a ZnSe precursor solution;

[0044] (3) Program controlled microwave irradiation to prepare ZnSe quantum dots

[0045] The obtained ZnSe precursor solution is subjected to program-controlled microwave radiation to obtain ZnSe quantum dots. The program control conditions are as follows:

[0046] The first program microwave power: 35W; the first program temperature: 90°C; the first program time: 30s;

[0047] Second program microwave power: 300W; second program temperature: 100°C; second program ti...

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Abstract

This invention discloses manufacture of water-soluble ZnSe/ZnS core/shell quantum dots by photodegradation together with program-controlled microwave radiation method. The method comprises the steps of: mixing zinc salt or zinc oxide with water-soluble thioglycollic acid in water phase, adding sodium selenium sulfite or potassium selenium sulfite formed by reaction of sodium sulfite or potassium sulfite with selenium powders, reacting to obtain ZnSe precursor solution, placing the solution in a glass tube for microwave radiation, controlling the microwave radiation by program to obtain ZnSe quantum dots, performing photodegradation to obtain water-soluble ZnSe/Zns core/shell quantum dots with a high fluorescence quantum efficiency. The method is completely operated in water phase, thus has such advantages as easy operation and low toxicity. The quantum dots manufactured have such advantages as high fluorescence quantum efficiency, high stability and good water solubility, and can be used as fluorescent labels and indicators for biological inspection and analysis.

Description

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Claims

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Application Information

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Owner FUDAN UNIV
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