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Quick green preparation method of cadmium telluride quantum dot

A fast technology of cadmium telluride quantum dots, applied in chemical instruments and methods, binary selenium/tellurium compounds, luminescent materials, etc., can solve problems such as increasing the production cost of quantum dots, affecting the purity of quantum dots, and using a large amount of hydrazine hydrate , to achieve cost reduction, mild reaction conditions and simple steps

Inactive Publication Date: 2014-01-29
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

However, sodium borohydride is used as a reducing agent, and soluble salts and precipitates may be generated during the synthesis of quantum dots, which will affect the purity of quantum dots.
In addition, it has been reported in the literature that hydrazine hydrate is used as a reducing agent to prepare quantum dots. This method can avoid the weakness of sodium borohydride, but the amount of hydrazine hydrate is large and has high toxicity, which will increase the industrial production cost of quantum dots. Environmental pollution and other issues

Method used

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  • Quick green preparation method of cadmium telluride quantum dot
  • Quick green preparation method of cadmium telluride quantum dot
  • Quick green preparation method of cadmium telluride quantum dot

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Embodiment 1

[0024] (1) At room temperature, weigh 0.2284g (1.0mmol) CdCl 2 2.5H 2 Dissolve O in 100ml deionized water, then add 1.5mmol thioglycolic acid and stir; use sodium hydroxide solution to adjust the acidity of the solution to pH=9;

[0025] (2) Weigh 0.0416g (0.4mmol) sodium bisulfite and add it directly into the solution of step (1), then add dropwise a sodium hydroxide solution with a concentration of 2mol / L to the solution to adjust the acidity of the solution system to pH=9 ;

[0026] (3) Weigh 0.0160g (0.1mmol) tellurium dioxide and directly add it into the three-neck bottle of the solution in step (2), seal and stir;

[0027] (4) Under the condition of magnetic stirring, reflux the solution prepared in step (3) at 85° C. for 5 minutes to obtain a water-soluble cadmium telluride quantum dot solution.

[0028] figure 1 Shown are the water-soluble cadmium telluride quantum dot solution homogeneous fluorescence spectrum and the ultraviolet-visible light absorption spectrogr...

Embodiment 2

[0030] (1) At room temperature, weigh 0.2284g (1.0mmol) CdCl 2 2.5H 2 Dissolve O in 100ml deionized water, then add 2.4mmol thioglycolic acid and stir; use sodium hydroxide solution to adjust the acidity of the solution to pH=10;

[0031] (2) Weigh 0.0416g (0.4mmol) sodium bisulfite and dissolve it directly in the solution of step (1), add dropwise a sodium hydroxide solution with a concentration of 2mol / L to the solution, and adjust the acidity of the solution to pH=10;

[0032] (3) Weigh 0.004g (0.025mmol) of tellurium dioxide and directly add it to the solution of step (2) to dissolve, seal and stir;

[0033] (4) Under the condition of magnetic stirring, the solution prepared in step (3) was refluxed at 98° C. for 20 minutes to obtain a water-soluble cadmium telluride quantum dot solution.

[0034] figure 2 Shown are the water-soluble cadmium telluride quantum dot solution homogeneous fluorescence spectrum and the ultraviolet-visible light absorption spectrogram prepare...

Embodiment 3

[0036] (1) At room temperature, weigh 0.2284g (1.0mmol) CdSO 4 Dissolve in 100ml deionized water, then add 2.4mmol thioglycolic acid, stir; use sodium hydroxide solution to adjust the acidity of the solution to pH=11;

[0037] (2) Weigh 0.0630g (0.5mmol) sodium sulfite and directly dissolve it in the solution of step (1), add dropwise a sodium hydroxide solution with a concentration of 2mol / L to the solution, and adjust the acidity of the solution to pH=11;

[0038] (3) Weigh 0.0110g (0.05mmol) of sodium tellurite and directly add it to the solution of step (2) to dissolve, seal and stir;

[0039] (4) Under the condition of magnetic stirring, the solution prepared in step (3) was refluxed at 88° C. for 60 minutes to obtain a water-soluble cadmium telluride quantum dot solution.

[0040] image 3 Shown are the water-soluble cadmium telluride quantum dot solution homogeneous fluorescence spectrum and the ultraviolet-visible light absorption spectrogram prepared in this embodim...

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Abstract

The invention belongs to the preparation of an inorganic semiconductor nanomaterial, and particularly relates to a quick green preparation method of a water-soluble cadmium telluride quantum dot. According to the method, a sulfur compound of valence +4 is used as a reducing agent, a sulfhydryl compound is used as a stabilizer, cadmium salt is used as a cadmium source, and tellurium dioxide, tellurite and tellurate are used as tellurium sources; in an air environment, the cadmium telluride quantum dot with high fluorescence and good biocompatibility is quickly prepared and directly synthesized by use of a water-phase system. Compared with the prior art, the method provided by the invention has the advantages that the raw materials are cheap, the cost is reduced, the synthesis conditions are mild, the steps are simple, and the method is green and environment-friendly and applicable to large-scale production and has a high value in practical application.

Description

technical field [0001] The invention belongs to the preparation of inorganic semiconductor nanometer materials, in particular to a fast green preparation method of water-soluble cadmium telluride quantum dots. Background technique [0002] Quantum dots, also known as semiconductor nanocrystals, are nanoparticles composed of II-IV and III-V elements, which have size-dependent electrical and optical properties, and are used in light-emitting diodes, nonlinear optics, solar cells , life sciences and other fields have a wide range of applications. Among them, cadmium telluride quantum dots have the best optical properties, such as strong and narrow emission peak, wide emission range (480nm~760nm) and so on. Therefore, cadmium telluride quantum dots are currently the most studied and widely used group II~IV quantum dots, and the preparation method of high-quality water-soluble cadmium telluride quantum dots has always been the focus of research. In 1993, Murray et al first prop...

Claims

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Application Information

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IPC IPC(8): C01B19/04C09K11/88
Inventor 曾云龙匡慧艳易平贵黄昊文唐春然唐子龙冯磊元晓云易守军王天伦
Owner HUNAN UNIV OF SCI & TECH
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