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Preparation method of water-soluble CdTe quantum dot

A quantum dot, water-soluble technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of cumbersome operation, limited greening and flexibility, harsh organic phase synthesis conditions, etc., to achieve high quantum yield, easy to implement , a small number of effects

Inactive Publication Date: 2012-08-15
EAST CHINA NORMAL UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, hydrogen telluride (H 2 Te) or sodium telluride hydride (NaHTe) as the tellurium source, the preparation process needs to be distributed, and the operation is more cumbersome
[0003] After investigating the existing literature, it was found that Shen et al published a paper titled "Size-and shape-controlled synthesis of CdTe and PbTe nanocrystals using tellurium dioxide as the tellurium precursor "("Synthesis of CdTe and PbTe nanoparticles with controllable shape and size using tellurium dioxide as tellurium source"), although the use of tellurium dioxide as tellurium source has improved the operation and performance of quantum dots, but The synthesis conditions of the organic phase are still relatively harsh, which limits the greenness and flexibility of the operation of the method

Method used

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  • Preparation method of water-soluble CdTe quantum dot
  • Preparation method of water-soluble CdTe quantum dot
  • Preparation method of water-soluble CdTe quantum dot

Examples

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Embodiment 1

[0039] (1) Dilute 1.24 ml of 80.7 mmol / L cadmium dichloride to 88.76 ml with distilled water at room temperature, and add 21.34 ul of MPA;

[0040] (2) Add 8.0 mg TeO to the solution in step (1) 2 , and then use sodium hydroxide to adjust the pH of the solution to 11.5;

[0041] (3) Nitrogen was passed to the solution of step (2) for 5 to 30 minutes, under stirring, 5.8 mg of sodium borohydride was added, and then 5 milliliters of distilled water was added to make sodium borohydride completely enter the solution;

[0042] (4) Heating the solution in step 3 to 100° C.; taking samples at regular intervals to monitor the progress of the reaction;

[0043] (5) Centrifuge the solution obtained in step (4) at a speed of 8000 rpm, remove the supernatant and disperse the precipitate in the acetone solution, centrifuge for 2 to 4 times, and finally dissolve the precipitate in water. Water-soluble CdTe quantum dots were obtained.

[0044] The molar ratio of raw materials in this exam...

Embodiment 2

[0047] The consumption of preparation step and cadmium dichloride is identical with embodiment 1, and raw material molar ratio is CdCl 2 :MPA:TeO 2 =1:1.3:0.5.

[0048] image 3 , Figure 4It is the fluorescence spectrogram and the ultraviolet-visible light absorption spectrogram of the water-soluble CdTe quantum dot obtained in Example 2.

Embodiment 3

[0050] The consumption of preparation steps and cadmium dichloride is identical with embodiment 1, and raw material molar ratio is CdCl 2 :MPA:TeO 2 =1:1.3:0.2.

[0051] Figure 5 , Image 6 It is the fluorescence spectrogram and the ultraviolet-visible light absorption spectrogram of the water-soluble CdTe quantum dot obtained in Example 3.

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Abstract

The invention discloses a preparation method of a water-soluble CdTe quantum dot, which includes: using cadmium salt as a cadmium source, tellurium dioxide as a tellurium source and sulfhydryl compound as stabilizer, and performing one-step preparation in a water phase system to directly synthetize high-fluorescence and water-soluble CdTe quantum dot. The preparation method has simple steps, used reagents are few, cost is low and the method is easy to implement. The whole production process meets the green and chemical requirements and is safe and environment-friendly. The prepared CdTe quantum dot has high quantum yield and high stability.

Description

technical field [0001] The invention relates to a preparation method of an inorganic semiconductor nanometer material, in particular to a preparation method of a water-soluble CdTe quantum dot. Background technique [0002] Quantum dots are a new type of inorganic semiconductor nanomaterials, which have aroused widespread interest in the academic community due to their excellent optical properties. Quantum dots have excellent luminescent properties, such as size-tunable fluorescence emission, narrow and symmetrical emission spectrum, wide and continuous absorption spectrum, and excellent photostability, which make him show great potential in biomarkers and bioimaging. potential. CdTe quantum dots are currently the most researched and most widely used group II-IV quantum dots. Because of their great application prospects in biomarkers and imaging, how to easily synthesize CdTe quantum dots has always been the direction that researchers are working hard. . At present, quant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88
Inventor 彭晖曹健罗春花李波王依婷
Owner EAST CHINA NORMAL UNIV
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