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Method for aqueous phase synthesizing stable GSH-CdTeSe alloy quantum dots

A technology of quantum dots and alloys, which is applied in the field of GSH-CdTeSe alloy quantum dots, can solve the problems of harsh preparation conditions, high reagent costs, and reduced stability, and achieve the effects of safe and simple operation, high quantum yield, and mild conditions

Inactive Publication Date: 2008-10-08
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of harsh preparation conditions, complex reaction steps, high reagent cost, high toxicity, cumbersome aqueous phase transfer steps, and quantum yield of the quantum dot aqueous solution obtained in the existing organic synthesis method of quantum dots. , the problem that the stability is greatly reduced; at the same time, it solves the problem that the synthesized quantum dots are easily oxidized and unstable in the buffer solution in the existing aqueous phase synthesis method, and provides a CdTeSe alloy quantum dot coated with glutathione in the aqueous phase synthesis Dot method, the obtained quantum dots have high quantum yield and good stability in the buffer solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First, the preparation of potassium tellurium hydride solution:

[0020] Add 48mg potassium borohydride, 38.3mg (3×10 -4 mol) Te powder and 2 mL of water were reacted at room temperature (25° C.) for 60 minutes under magnetic stirring to obtain a colorless and transparent liquid, that is, a fresh, oxygen-free potassium tellurium hydride aqueous solution, which is ready for use.

[0021] Second, the preparation of potassium selenium hydride solution:

[0022] Add 20mg potassium borohydride, 14.5mg (1.5×10 -4 mol) Se powder and 1.5 mL of water are reacted at room temperature (25° C.) for 10 minutes under magnetic stirring to prepare a colorless and transparent liquid, that is, a fresh and oxygen-free potassium selenium hydride aqueous solution for use.

[0023] Third, the preparation of cadmium chloride and glutathione solution (GSH):

[0024] Take 3mL 0.1mol L -1 CdCl 2 The aqueous solution is put into a beaker, add 55mL of water and 0.00036mol of stabilizer glutathione, use...

Embodiment 2

[0028] First, the preparation of potassium tellurium hydride solution:

[0029] Add 48mg potassium borohydride, 38.3mg (3×10 -4 mol) Te powder and 4 mL of water were reacted at room temperature (25° C.) for 90 minutes under magnetic stirring to obtain a colorless and transparent liquid, namely, a fresh, oxygen-free potassium tellurium hydride aqueous solution, which was used for later use.

[0030] Second, the preparation of potassium selenium hydride solution:

[0031] Add 20mg potassium borohydride, 14.5mg (1.5×10 -4 mol) Se powder and 3 mL of water were reacted at room temperature (25° C.) for 30 minutes under magnetic stirring to prepare a colorless and transparent liquid, that is, a fresh, oxygen-free potassium selenium hydride aqueous solution, which is ready for use.

[0032] Third, the preparation of cadmium chloride and glutathione solution (GSH):

[0033] Take 3mL 0.1mol L -1 CdCl 2 The aqueous solution is put into a beaker, add 55mL of water and 0.00036mol of stabilizer...

Embodiment 3

[0037] First, the preparation of sodium tellurium hydride solution:

[0038] In the reaction vessel with a vent hole, add 28mg sodium borohydride, 38.3mg (3×10 -4 mol) Te powder and 4 mL of water were reacted at room temperature (25° C.) for 90 minutes under magnetic stirring to prepare a colorless and transparent liquid, that is, a fresh, oxygen-free sodium tellurium hydride aqueous solution, which was used for later use.

[0039] Second, the preparation of sodium selenium hydride solution:

[0040] In a reaction vessel with a vent hole, add 14mg sodium borohydride, 14.5mg (1.5×10 -4 mol) Se powder and 3 mL of water were reacted at room temperature (25° C.) for 30 minutes under magnetic stirring to obtain a colorless and transparent liquid, that is, a fresh and oxygen-free aqueous sodium selenium hydride solution, which was then used.

[0041] Third, the preparation of cadmium chloride and glutathione solution (GSH):

[0042] Take 3mL 0.1mol L -1 CdCl 2 The aqueous solution is in...

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Abstract

Disclosed is the method of synthesizing stable GSH-CdTeSe alloy quantum dot in water phase. Biological small molecular glutathione (GSH) is used as stabilizer and complexing agent in water solution; inorganic salt CdCl2 is added to the solution; tellurium potassium hydride (sodium) solution and selenium potassium hydride (sodium) solution prepared by the reaction of potassium borohydride (sodium) and tellurium powder or selenium powder are injected to the solution under the protection of inert gas; and then the heating reflux is processed to generate the soluble GSH-CdTeSe alloy quantum dot; the GSH-CdTeSe alloy quantum dots with different particle diameter and adjustable spectrum through the control of the reflux time and the composition. The preparation method has the advantages of convenient operation, low cost and strong operability. The obtained soluble GSH-CdTeSe alloy quantum dot is purified and dried, and then is dissolved in Tris-HCl buffer solution (pH=7.4); the synthesizing method of the GSH-CdTeSe alloy quantum dot has high dot production rate and high stability.

Description

【Technical Field】: [0001] The invention relates to a method for preparing stable GSH-CdTeSe alloy quantum dots in an aqueous phase, and belongs to the technical field of nanomaterial preparation. 【Background technique】: [0002] Quantum dots, also known as semiconductor nanocrystals, are mainly composed of II-VI elements or III-V elements. Because its physical size is smaller than the Bohr radius of excitons, it leads to a quantum confinement effect, which makes quantum dots have unique optical and electrical properties, such as size quantum effect, dielectric confinement effect, and derived quantum Point unique luminous characteristics. Compared with organic fluorescent dyes, the fluorescent properties of quantum dots have many advantages: wide excitation spectrum, narrow and symmetrical emission peak, adjustable spectrum, high quantum yield, good light stability, etc. For quantum dots with an alloy structure, not only can the fluorescence emission wavelength be adjusted by chan...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 严秀平陈英军李妍
Owner NANKAI UNIV
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