Method for synthesizing Cu doped CdxCu1-xTe quantum dot by using hydrothermal method

A technology of quantum dots and hydrothermal method, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of poor fluorescence stability of CdTe quantum dots, high toxicity of CdTe quantum dots, easy volatilization and odor, etc., and achieve fluorescence emission. The effect of adjustable wavelength, low cost and low toxicity

Inactive Publication Date: 2013-04-03
GUANGXI TEACHERS EDUCATION UNIV
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

At present, the reported hydrothermal synthesis of CdTe quantum dots mainly uses small thiol molecules such as thioglycolic acid, mercaptopropionic acid, and mercaptoethylamine as modifiers. Such small thiol molecules have poor stability, high toxicity, and are prone to volatile odor. The fluorescent stability and biocompatibility of the prepared CdTe quantum dots are poor
As we all know, Cd is a toxic heavy metal element, which makes the prepared CdTe quantum dots more toxic, which limits the application of this quantum dot 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 Hydrothermal Synthesis of Cu-doped Cd x Cu 1-x The 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 80°C for 1h to obtain a sodium telluride hydride NaHTe solution for later use;

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

[0023] 0.02mmol CdCl 2 , 0.02mmol CuCl 2 Dissolve 0.02mmol N-acetyl-L-cysteine ​​in 40mL distilled water, adjust the pH value to 7.0 with 1mol / L NaOH solution, blow nitrogen gas for 40min to remove oxygen, add 50μL sodium telluride hydride NaHTe solution prepared in step 1, mix After uniformity, transfer to a hydrothermal reaction kettle, heat to 170°C and react for 90 minutes to obtain 40 mL of Cu-doped Cd with adjustable fluorescence emission wavelength and high fluorescence quantum yield. x Cu 1-x...

Embodiment 2

[0025] A Hydrothermal Synthesis of Cu-doped Cd x Cu 1-x The method of Te quantum dot, its step is as follows:

[0026] 1. Preparation of sodium telluride hydride NaHTe solution

[0027] 0.4mmol Te powder and 1.6mmol NaBH 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 4h to obtain a sodium telluride hydride NaHTe solution for later use;

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

[0029] 0.4mmol CdBr 2 , 0.8mmol CuBr 2 Dissolve 0.8mmol N-acetyl-L-cysteine ​​in 20mL distilled water, adjust the pH value to 8.0 with 1mol / L NaOH solution, pass nitrogen gas for 40min to remove oxygen, add 2mL sodium telluride hydride NaHTe solution prepared in step 1, mix After uniformity, transfer to a hydrothermal reaction kettle, heat to 190°C and react for 60min, and 22mL of Cu-doped Cd with adjustable fluorescence emission wavelength and high fluorescence quantum yield can be obtained. x Cu 1-...

Embodiment 3

[0031] A Hydrothermal Synthesis of Cu-doped Cd x Cu 1-x The 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, and stir and react at 100°C for 8h to obtain a sodium telluride hydride NaHTe solution for later use;

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

[0035] 1.4mmol CdI 2 , 5.6mmol CuI 2 Dissolve 4.2mmol of N-acetyl-L-cysteine ​​in 70mL of distilled water, adjust the pH value to 9.0 with 1mol / L NaOH solution, pass nitrogen gas for 40min to remove oxygen, add 8mL of sodium telluride hydride NaHTe solution prepared in step 1, and mix After uniformity, transfer to a hydrothermal reaction kettle, heat to 200°C and react for 5 minutes to obtain 78 mL of Cu-doped Cd with adjustable fluorescence emission wavelength and high fluorescence quantum yield. ...

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Abstract

The invention discloses a method for synthesizing Cu doped CdxCu1-xTe quantum dot by using a hydrothermal method; the preparation method comprises the following operation steps of: in the presence of nitrogen, injecting a pre-prepared sodium tellurium hydride NaHTe solution in a pre-prepared mixed solution of cadmium salt, copper salt and water soluble N-acetyl-L-cysteine, to obtain a CdxCu1-xTe precursor solution; then putting the solution in a hydrothermal reaction kettle, reacting to prepare the Cu doped CdxCu1-xTe quantum dot with adjustable fluorescence-emission wavelength and high fluorescence quantum dot yield. The hydrothermal method disclosed by the invention is low in cost, convenient to control, environmentally-friendly, and the like; the obtained Cu doped CdxCu1-xTe quantum dot is high in fluorescence stability, excellent in biocompatibility and low in toxicity, and is expected to be used widely in biochemical analysis and biomedical fields as novel fluorescence nano probe.

Description

technical field [0001] The invention belongs to the technical field of biochemical analysis and detection technology and preparation of nanomaterials, and in particular relates to a hydrothermal method for synthesizing Cu-doped Cd x Cu 1-x Te quantum dot approach. Background technique [0002] Quantum dots are quasi-zero-dimensional nanocrystals composed of II-VI or III-V elements. Compared with traditional organic dyes and fluorescent proteins, quantum dots have superior spectral properties, such as broad and continuous excitation spectrum, narrow and symmetrical emission spectrum, adjustable emission wavelength, high fluorescence stability, and strong photobleaching resistance. These superior spectral properties make quantum dots widely used in biochemical analysis and biomedicine. Therefore, the synthesis of high-quality, multifunctional fluorescent quantum dots has also attracted great attention. The development of a new method for the preparation of quantum dots wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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