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Rapid preparation method of inorganic compound coated aqueous phase II-VI group quantum dot composite material

A composite material and quantum dot technology, which is applied in the field of rapid preparation of inorganic-coated aqueous phase II-VI quantum dot composite materials, can solve the problems of low efficiency of quantum dot coating by sodium chloride and long synthesis time, etc. Achieve the effect of low cost, good stability and strong fluorescence emission

Active Publication Date: 2015-09-30
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the compound obtained has good optical properties, there are some deficiencies in this method, such as long synthesis time and low (<1%) coating efficiency of quantum dots by sodium chloride.

Method used

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  • Rapid preparation method of inorganic compound coated aqueous phase II-VI group quantum dot composite material
  • Rapid preparation method of inorganic compound coated aqueous phase II-VI group quantum dot composite material
  • Rapid preparation method of inorganic compound coated aqueous phase II-VI group quantum dot composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Stir and dissolve 0.04g sodium borohydride, 0.046g tellurium powder and 2ml deionized water under a nitrogen atmosphere until the solution turns light pink to obtain an anion precursor;

[0023] 2. Dissolve 0.114g of cadmium chloride in 100ml of deionized water, add 0.133g of mercaptopropionic acid, adjust the pH of the solution to 8.0 with 1M sodium hydroxide solution, and pass nitrogen gas for 30 minutes to obtain a cationic precursor;

[0024] 3. Inject 400 μl of the anion precursor solution prepared in step 1 into the cationic precursor solution prepared in step 2 under stirring, heat to 90°C and reflux, take 20 mL samples at 1, 3, 5, 7, and 10 hours of reaction, and cool to room temperature , to obtain cadmium telluride quantum dot solutions with different wavelengths.

[0025] 4. Dissolve 5g of sodium chloride in the 20ml cadmium telluride quantum dot solution prepared in step 3, quickly add 50ml of ethanol under stirring, generate a precipitate, filter, dry, a...

Embodiment 2

[0027] 1. Stir and dissolve 0.04g sodium borohydride, 0.046g tellurium powder and 2ml deionized water under a nitrogen atmosphere until the solution turns light pink to obtain an anion precursor;

[0028] 2. Dissolve 0.114g of cadmium chloride in 100ml of deionized water, add 0.092g of mercaptoacetic acid, adjust the pH of the solution to 8.0 with 1M sodium hydroxide solution, and pass nitrogen gas for 30 minutes to obtain a cationic precursor;

[0029] 3. Inject 400 μl of the anion precursor solution prepared in step 1 into the cation precursor solution prepared in step 2 under stirring, heat to 90° C. for reflux reaction for 9 hours, stop heating, and cool to room temperature to obtain a cadmium telluride quantum dot solution.

[0030] 4. Dissolve 5g of sodium sulfate in 100ml of cadmium telluride quantum dot solution prepared in step 3, quickly add 200ml of methanol under stirring, generate precipitate, filter, dry, and grind into fine powder to obtain cadmium telluride quan...

Embodiment 3

[0032] 1. Stir and dissolve 0.04g sodium borohydride, 0.046g tellurium powder and 2ml deionized water under a nitrogen atmosphere until the solution turns light pink to obtain an anion precursor;

[0033] 2. Dissolve 0.114g of cadmium chloride in 100ml of deionized water, add 0.192g of glutathione, adjust the pH of the solution to 8.0 with 1M sodium hydroxide solution, and pass nitrogen gas for 30 minutes to obtain a cationic precursor;

[0034] 3. Under stirring, inject 400 μl of the anion precursor solution prepared in step 1 into the cation precursor solution prepared in step 2, heat to 90° C. for reflux reaction for 9 hours, stop heating, and cool to room temperature to obtain a cadmium telluride quantum dot solution.

[0035] 4. Dissolve 5g of sodium carbonate in 100ml of cadmium telluride quantum dot solution prepared in step 3, quickly add 150ml of ethanol under stirring to form a precipitate, filter, dry, and grind into fine powder to obtain cadmium telluride quantum do...

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Abstract

The present invention discloses a rapid preparation method of an inorganic compound coated aqueous phase II-VI group quantum dot composite material. The rapid preparation method comprises: adopting cadmium chloride or zinc chloride as a cation source, adopting sulfur powder, tellurium powder or selenium powder as an anion source, adopting sodium borohydride as a reducing agent, adopting mercaptopropionic acid, thioglycolic acid or glutathione and other mercapto compounds as ligands, heating to a temperature of 90-100 DEG C, and refluxing for different times to obtain quantum dots with different emission wavelengths; and adding a sodium salt or potassium salt to the quantum dot solution, carrying out stirring dissolving, adding excessive methanol, ethanol, propanol or acetone and other polar organic solvents, precipitating, filtering, drying, and grinding to obtain the corresponding quantum dot / inorganic compound complex powder with characteristics of strong fluorescence emission and high stability, wherein the powder can be used in the field of solid luminescent materials. The method of the present invention has characteristics of simple operation, rapidness, high efficiency, and green environmental protection, and is suitable for mass production.

Description

1. Technical field [0001] The invention relates to a rapid preparation method of an inorganic substance-coated aqueous phase II-VI quantum dot composite material, which belongs to the technical field of nanometer materials and inorganic material composites. 2. Background technology [0002] Due to its unique quantum effect, quantum dots have excellent properties such as continuously adjustable emission wavelength, wide and continuous excitation spectrum, narrow and symmetrical emission spectrum, high fluorescence quantum yield, and good stability. They have great potential in the fields of biomarkers and photoelectric devices. huge potential. Group II-VI quantum dots such as cadmium telluride and cadmium selenide change with their size, and their emission spectrum can cover the entire visible light region and near-infrared region. High quantum yield can be achieved through surface modification. It is the most researched and applied quantum dot at present. Widest range of qu...

Claims

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Application Information

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IPC IPC(8): C09K11/88C09K11/02
Inventor 蒋阳常亚婧张忠平姚旭东米龙飞
Owner HEFEI UNIV OF TECH
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