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Preparation method of water-soluble Mn-doped CdxMn1-xTe quantum dot

A water-soluble, quantum dot technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of poor fluorescence stability of CdTe quantum dots, limited application of CdTe quantum dots, and high toxicity of CdTe quantum dots, and achieves a fluorescence emission wavelength that can be The effect of adjustment, low cost and low toxicity

Inactive Publication Date: 2013-04-24
GUANGXI TEACHERS EDUCATION UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reported CdTe quantum dots prepared in aqueous solution mainly use thioglycolic acid as a modifier. The performance of thioglycolic acid is unstable and volatile, which makes the fluorescence stability and biocompatibility of CdTe quantum dots poor.
In addition, Cd is a toxic heavy metal element, which makes CdTe quantum dots more toxic, which limits the application of CdTe quantum dots in the fields of biochemical analysis and biomedicine.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A water-soluble Mn-doped Cd x mn 1-x The preparation method of Te quantum dot, its step is as follows:

[0020] 1. Preparation of sodium telluride hydride NaHTe solution

[0021] 0.2mmol Te powder and 0.4mmol NaBH 4 Put it into a two-necked flask, add 5mL of distilled water, protect it with nitrogen, and stir and react at 70°C for 0.5h to obtain a sodium telluride hydride NaHTe solution for later use;

[0022] 2. Mn-doped Cd x mn 1-x Preparation of Te quantum dots

[0023] 0.02mmol CdCl 2 , 0.002mmol MnCl 2 Dissolve 0.02mmol N-acetyl-L-cysteine ​​in 40mL distilled water, adjust the pH value to 8.0 with 1mol / L NaOH solution, add 50μL sodium telluride hydride NaHTe solution prepared in step 1, protect with nitrogen, at 80°C Heating to reflux for 10 min, 40 mL of water-soluble Mn-doped Cd with adjustable fluorescence emission wavelength and high fluorescence quantum yield can be obtained x mn 1-x Te quantum dot solution.

Embodiment 2

[0025] A water-soluble Mn-doped Cd x mn 1-x The preparation method of Te quantum dot, its step is as follows:

[0026] 1. Preparation of potassium hydride telluride KHTe solution

[0027] 0.4mmol Te powder and 1.2mmol KBH 4 Put it into a two-necked flask, add 4mL of distilled water, protect it with nitrogen, and stir and react at 90°C for 2h to obtain a potassium telluride hydride KHTe solution for later use;

[0028] 2. Mn-doped Cd x mn 1-x Preparation of Te quantum dots

[0029] 0.4mmol CdBr 2 , 0.1mmol MnI 2 Dissolve 0.8mmol N-acetyl-L-cysteine ​​in 20mL distilled water, adjust the pH value to 10.0 with 1mol / L NaOH solution, add 2mL of potassium hydride telluride KHTe solution prepared in step 1, protect with nitrogen, at 90° C heated to reflux for 60min, 22mL of water-soluble Mn-doped Cd with adjustable fluorescence emission wavelength and high fluorescence quantum yield can be obtained x mn 1-x Te quantum dot solution.

Embodiment 3

[0031] A water-soluble Mn-doped Cd x mn 1-x The preparation method of Te quantum dot, its step is as follows:

[0032] 1. Preparation of sodium telluride hydride NaHTe solution

[0033] 1.12mmol Te powder and 5.60mmol NaBH 4 Put it into a two-necked flask, add 8mL of distilled water, protect it with nitrogen, stir and react at 100°C for 10h, and obtain a sodium telluride hydride NaHTe solution for later use;

[0034] 2. Mn-doped Cd x mn 1-x Preparation of Te quantum dots

[0035] 1.4mmol CdI 2 , 0.7mmol MnSO 4 Dissolve 4.2mmol of N-acetyl-L-cysteine ​​in 70mL of distilled water, adjust the pH value to 12.0 with 1mol / L NaOH solution, add 8mL of the sodium hydride telluride NaHTe solution prepared in step 1, protect with nitrogen, at 100° C is heated to reflux for 100min, and 78mL of water-soluble Mn-doped Cd with adjustable fluorescence emission wavelength and high fluorescence quantum yield can be obtained. x mn 1-x Te quantum dot solution.

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Abstract

The invention discloses a preparation method of a water-soluble Mu-doped CdxMn1-xTe quantum dot. The preparation method comprises the operating step of: filling NaHTe or KHTe solution which is prepared in advance into a mixed solution of cadmium salts, manganese salts and water-soluble N-acetyl-L-cysteine which is prepared in advance under nitrogen protection so as to obtain a water-soluble Mn-doped CdxMn1-xTe quantum dot with an adjustable fluorescence emission wavelength and a high fluorescence quantum yield. The preparation method is carried out in an aqueous solution, and has the advantages of being easy to obtain the raw materials, simple, convenient and safe to operate, green and environment-friendly, and the like. The prepared water-soluble Mn-doped CdxMn1-xTe quantum dot has the advantages of excellent fluorescence properties, good water solubility, excellent fluorescence property, good biocompatibility, low toxicity and the like, and can be used as a novel fluorescent nanoemter probe to be widely applied to the fields of biochemical analysis and biomedicine.

Description

technical field [0001] The invention belongs to the technical field of biochemical analysis and detection technology and preparation of nanomaterials, in particular to a water-soluble Mn-doped Cd x mn 1-x Preparation method of Te quantum dots. Background technique [0002] Quantum dots are inorganic semiconductor nanocrystals with a diameter between 2 and 10 nm and composed of II-VI or III-V elements. In view of the wide application of quantum dots in biochemical analysis and biomedicine, the synthesis of high-quality, multifunctional fluorescent quantum dots has gradually attracted great attention. So far, a variety of quantum dots with excellent fluorescence properties have been prepared by organic phase synthesis methods, but such quantum dots have poor water solubility and biocompatibility, which greatly limits their applications in the fields of biochemical analysis and biomedicine. Therefore, the development of a new preparation method for directly synthesizing quan...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 黄珊肖琦苏炜盛家荣黄燕敏甘春芳崔建国
Owner GUANGXI TEACHERS EDUCATION UNIV
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