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Method for fast preparing soluble near infrared CdTe quantum dots covered with mercaptan in aqueous phase

A near-infrared and quantum dot technology, which is applied in the field of water-soluble CdTe quantum dots, can solve the problems of taking a long time and achieve the effects of low production cost, low toxicity and simple reaction conditions

Inactive Publication Date: 2011-06-08
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, due to the influence of the boiling point of the solvent water in the aqueous phase synthesis, it is difficult for the reaction system to obtain enough energy to make the CdTe quantum dots form a hexagonal zinc sulfide crystal with a narrower energy band from the cubic zinc blende structure. type (wurtzite structure) transformation; therefore, the synthesis of near-infrared CdTe quantum dots in the aqueous phase by conventional methods often takes a long time or doping them with other heavy metal ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (a) In a closed reaction vessel with a syringe needle, add 49mg (0.9mmol) KBH 4 , 38mg (0.3mmol) of Te powder and 3mL of deionized water were reacted at room temperature for 20 minutes under magnetic stirring to obtain a colorless and transparent liquid, namely fresh anaerobic KHTe aqueous solution;

[0028] (b) CdCl 2 and the preparation of L-cysteine ​​aqueous solution: add 34ml deionized water and 1mL (0.4mol L -1 )CdCl 2 Aqueous solution, use 1mol L -1 Aqueous NaOH solution to adjust the pH to 10.0;

[0029] (c) 50mL three-neck flask is added to the prepared step (b) containing CdCl 2 and an aqueous solution of L-cysteine, under argon protection, stirred for 30 minutes;

[0030] (d) get the fresh anaerobic KHTe aqueous solution 0.5mL that prepares in (a) step and join in (c) step;

[0031] (e) The mixed solution in (d) step is heated to 100 DEG C, reflux reaction 60~90 minutes;

[0032] (f) Take 5mL of the CdTe solution prepared in step (e) as the observed fl...

Embodiment 2

[0034] (a) In a closed reaction vessel with a syringe needle, add 16mg (0.3mmol) KBH 4 , 12.7mg (0.1mmol) of Te powder and 1mL of deionized water were reacted at room temperature for 10 minutes under magnetic stirring to obtain a colorless and transparent liquid, namely fresh anaerobic KHTe aqueous solution;

[0035] (b) CdCl 2 and glutathione (GSH) aqueous solution: add 34mL deionized water and 1mL (0.4mol L -1 )CdCl 2 Aqueous solution, use 1mol L -1 Aqueous NaOH solution to adjust the pH to 10.0;

[0036] (c) 100mL three-neck flask is added to the prepared step (b) containing CdCl 2 and glutathione aqueous solution, argon protection, stirred for 20 minutes;

[0037] (d) 1 mL of fresh anaerobic KHTe aqueous solution prepared in (a) step is all added in (c) step;

[0038] (e) The mixed solution in step (d) was heated to 100° C., and refluxed for 30 minutes;

[0039] (f) Take 5mL of the CdTe solution prepared in step (e) as a sample for observing fluorescence.

Embodiment 3

[0041] (a) In a closed reaction vessel with a syringe needle, add 49mg (0.9mmol) KBH 4 , 38mg (0.3mmol) of Te powder and 3mL of deionized water were reacted at room temperature for 20 minutes under magnetic stirring to obtain a colorless and transparent liquid, namely fresh anaerobic KHTe aqueous solution;

[0042] (b) CdCl2 Preparation of aqueous solution of mercaptopropionic acid and mercaptopropionic acid: add 34ml deionized water and 1mL (0.4mol L -1 )CdCl 2 Aqueous solution, use 1mol L -1 Aqueous NaOH solution to adjust the pH to 10.0;

[0043] (c) 50mL three-neck flask is added to the prepared step (b) containing CdCl 2 and an aqueous solution of mercaptopropionic acid, under argon protection, stirred for 30 minutes;

[0044] (d) get the fresh anaerobic KHTe aqueous solution 0.5mL that prepares in (a) step and join in (c) step;

[0045] (e) The mixed solution in (d) step is heated to 100 DEG C, reflux reaction 60~90 minutes;

[0046] (f) Take 5mL of the CdTe soluti...

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Abstract

A method for fast preparing soluble near infrared CdTe quantum dots covered with mercaptan in aqueous phase relates to the preparation field of quantum dot. The method comprises the following steps: (a) adding NaBH4 or KBH4 and Te powder, adding deionized water to react at the room temperature under magnetic stirring and prepare NaHTe or KHTe solution; (b) preparing cadmium salt or cadmium oxide, cadmium hydroxide and cadmium sulfhydryl compound solution; (c) adding the solution obtained in the step (b) in a three-necked bottle, protecting with argon, stirring; (d) adding fresh and oxygen-free NaHTe or KHTe solution prepared in the step (a) in the three-necked bottle of the step (c); and (e) heating and refluxing to react and obtain the near infrared CdTe quantum dots. The method of the invention has simple operations, mild conditions and low cost and toxicity. The synthetized mercaptan modified CdTe quantum dots have good water-solubility and stability; and the fluorescence quantum yield is high and the emission spectrum can be adjusted in the near infrared region.

Description

【Technical field】: [0001] The invention relates to the field of preparation of quantum dots, in particular to a method for water-soluble CdTe quantum dots. 【Background technique】: [0002] Quantum dots are semiconductor nanocrystals or microcrystals, composed of II-VI, III-V or IV-VI period elements, spherical substances with a diameter of 1-12 nanometers. At present, more studies are made on type II-VI quantum dots such as CdS, CdSe, CdTe, and ZnS. These nanoparticles exhibit different properties from macroscopic substances, including high quantum emission yields, size-tunable emission spectra, and narrow spectral bands. In addition, controlling the size can tune the position of the emission spectrum. The unique properties of quantum dots are based on their own quantum effects. When the particle size reaches the nanometer level, the size effect, quantum confinement effect, macroscopic quantum tunneling effect and surface effect are caused by the size confinement, thus der...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/02
Inventor 严秀平吴伯岳王荷芳
Owner NANKAI UNIV
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