Method for synthesizing Co-doped CdxCo1-xTe quantum dot by hydrothermal method

A technology of quantum dots and hydrothermal method, which is applied in the field of Co-doped CdxCo1-xTe quantum dots synthesized by hydrothermal method, which can solve the problems of poor fluorescence stability of CdTe quantum dots, limiting the application of CdTe quantum dots, and high toxicity of CdTe quantum dots. , to achieve the effects of adjustable fluorescence emission wavelength, low cost and low toxicity

Inactive Publication Date: 2013-03-27
GUANGXI TEACHERS EDUCATION UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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. Poor fluorescence stability and poor biocompatibility of dots
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 Hydrothermal Synthesis of Co-doped Cd x co 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 70°C for 0.5h to obtain a sodium telluride hydride NaHTe solution for later use;

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

[0023] 0.02mmol CdCl 2 , 0.02mmol CoCl 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 30min to remove oxygen, add 50μL sodium telluride hydride NaHTe solution prepared in step 1, and mix well Then transferred to a hydrothermal reaction kettle, heated to 180 ° C for 5 minutes, and 40 mL of Co-doped Cd with adjustable fluorescence emission wavelength and high fluorescence quantum yield can be obtained. x c...

Embodiment 2

[0025] A Hydrothermal Synthesis of Co-doped Cd x co 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 1.2mmol 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 2h to obtain a sodium telluride hydride NaHTe solution for later use;

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

[0029] 0.4mmol CdBr 2 , 0.8mmol CoBr 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 30min 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 30 minutes to obtain 22 mL of Co-doped Cd with adjustable fluorescence emission wavelength and high fluorescence quantum yield. x co 1-x Te ...

Embodiment 3

[0031] A Hydrothermal Synthesis of Co-doped Cd x co 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, stir and react at 100°C for 10h, and obtain a sodium telluride hydride NaHTe solution for later use;

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

[0035] 1.4mmol CdI 2 , 7.0 mmol CoSO 4 Dissolve 4.2mmol of N-acetyl-L-cysteine ​​in 70mL of distilled water, adjust the pH value to 10.0 with 1mol / L NaOH solution, pass nitrogen gas for 30min 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 60 minutes to obtain 78 mL of Co-doped Cd with adjustable fluorescence emission wavelength and high fluorescence quantum yield...

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Abstract

The invention discloses a method for synthesizing a Co-doped CdxCo1-xTe quantum dot by a hydrothermal method. The preparation method comprises the following operation steps: injecting prepared sodium hydrogen telluride NaHTe into a prepared mixed solution of cadmium salt, cobalt salt and water-soluble N-acetyl-L-cysteine under the protection of nitrogen gas to obtain a CdxCo1-xTe precursor solution; then placing the CdxCo1-xTe precursor solution into a hydrothermal reaction kettle; and reacting to prepare the Co-doped CdxCo1-xTe quantum dot with adjustable fluorescence-emission wave length and high fluorescence quantum yield. The method is carried out in an aqueous solution, and has the advantages of easily obtained raw materials, low cost, convenience and safety for operation, green and environmental protection and the like. The prepared Co-doped CdxCo1-xTe quantum dot is excellent in fluorescence property, good in biocompatibility, low in toxicity and can be applied to the field of biochemical analysis and biomedicine as a novel fluorescent nano-probe.

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 hydrothermal method for synthesizing Co-doped Cd x co 1-x Te quantum dot approach. 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. Compared with traditional organic dyes, quantum dots have superior fluorescence 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 fluorescent properties make quantum dots widely used in biochemical analysis and biomedicine. Therefore, the synthesis of high-quality, multifunctional fluorescent quantum dots has gradually attracted great attention. So far, people have prepared a variety of quantum dots ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88
Inventor 肖琦黄珊苏炜盛家荣黄燕敏甘春芳崔建国
Owner GUANGXI TEACHERS EDUCATION UNIV
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