Method of synthesizing rear earth Dy-doped CdTe:Dy quantum dot by hydrothermal process

A hydrothermal method and quantum dot technology, 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, and restrictions on the application of quantum dots, etc. Adjustment and operation are simple, convenient, safe and low cost

Inactive Publication Date: 2014-03-19
GUANGXI TEACHERS EDUCATION UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The reported hydrothermal synthesis of CdTe quantum dots mainly uses unstable thioglycolic acid and mercaptopropionic acid small thiol molecules as modifiers, which makes the prepared CdTe quantum dots have poor fluorescence stability and poor biocompatibility.
In addition, due to the presence of toxic heavy metal element Cd, CdTe quantum dots are more toxic, which limits the application of this quantum dot in the fields of biochemical analysis and biomedicine.

Method used

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Comparison scheme
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Embodiment 1

[0019] A kind of hydrothermal synthesis rare earth Dy-doped CdTe: the method for Dy quantum dot, its step is as follows:

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

[0021] Put 0.2mmol tellurium powder and 0.4mmol sodium borohydride into a two-necked flask, add 5mL distilled water, and under nitrogen protection, stir and react at 85°C for 55min to obtain sodium telluride hydride NaHTe solution for later use;

[0022] 2. Preparation of rare earth Dy-doped CdTe:Dy quantum dots

[0023] 0.02mmol CdCl 2 , 0.001mmol Dy 2 o 3 Dissolve 0.02mmol N-acetyl-L-cysteine ​​in 40mL distilled water, adjust the pH value to 8.0 with 1mol / L NaOH solution, under nitrogen protection, add 50mL sodium telluride hydride NaHTe solution prepared in step 1, mix well Afterwards, it was transferred to a hydrothermal reaction kettle and heated to 175° C. for 70 minutes to obtain 40 mL rare earth Dy-doped CdTe:Dy quantum dot solution with adjustable fluorescence emission waveleng...

Embodiment 2

[0025] A kind of hydrothermal synthesis rare earth Dy-doped CdTe: the method for Dy quantum dot, its step is as follows:

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

[0027] Put 0.4mmol tellurium powder and 1.6mmol sodium borohydride into a two-necked flask, add 4mL distilled water, and under nitrogen protection, stir and react at 90°C for 30min to obtain sodium telluride hydride NaHTe solution for later use;

[0028] 2. Preparation of rare earth Dy-doped CdTe:Dy quantum dots

[0029] 0.4mmol CdBr 2 , 0.04mmol Dy 2 o 3 Dissolve 0.8mmol N-acetyl-L-cysteine ​​in 20mL distilled water, adjust the pH value to 9.0 with 1mol / L NaOH solution, under nitrogen protection, add 2mL sodium telluride hydride NaHTe solution prepared in step 1, mix well Afterwards, it was transferred to a hydrothermal reaction kettle and heated to 190° C. for 40 minutes to obtain 22 mL rare earth Dy-doped CdTe:Dy quantum dot solution with adjustable fluorescence emission wavelength a...

Embodiment 3

[0031] A kind of hydrothermal synthesis rare earth Dy-doped CdTe: the method for Dy quantum dot, its step is as follows:

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

[0033] Put 1.12mmol tellurium powder and 5.60mmol sodium borohydride into a two-necked flask, add 8mL distilled water, and under nitrogen protection, stir and react at 100°C for 10min to obtain sodium telluride hydride NaHTe solution for later use;

[0034] 2. Preparation of rare earth Dy-doped CdTe:Dy quantum dots

[0035] 1.4mmol CdI 2 , 0.28mmol Dy 2 o 3 Dissolve 4.2mmol of N-acetyl-L-cysteine ​​in 70mL of distilled water, adjust the pH value to 10.5 with 1mol / L NaOH solution, under nitrogen protection, add 8mL of sodium telluride hydride NaHTe solution prepared in step 1, mix well Afterwards, it was transferred to a hydrothermal reaction kettle and heated to 200° C. to react for 5 minutes to obtain 78 mL rare earth Dy-doped CdTe:Dy quantum dot solution with adjustable fluorescence e...

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Abstract

The invention discloses a method of synthesizing a rear earth Dy-doped CdTe:Dy quantum dot by a hydrothermal process. Operation steps of the preparation method are as follows: under protection of nitrogen gas, injecting pre-prepared sodium hydrogen telluride liquor into mixed liquor of pre-prepared cadmium salt, dysprosium oxide and a modifier water-soluble N-acetyl-L-cysteine; and then, placing the liquor into a hydrothermal reaction kettle for reacting and preparing the rear earth Dy-doped CdTe:Dy quantum dot which is adjustable in fluorescence emission wavelength and high in fluorescence quantum yield. The hydrothermal process has advantages of being low in operation cost, simple, convenient and safe to operate, green, environment-friendly, and the like. The obtained rear earth Dy-doped CdTe:Dy quantum dot has the advantages of being excellent in fluorescence performance, good in biocompatibility, low in toxicity, and the like, and can be used as a novel fluorescence nanoprobe for being widely applied to biochemical analysis and the biomedicine field.

Description

technical field [0001] The invention belongs to the technical field of biochemical analysis and detection technology and nanometer material preparation, and specifically relates to a method for synthesizing CdTe:Dy quantum dots doped with rare earth Dy by a hydrothermal method. Background technique [0002] Quantum dots are quasi-zero-dimensional nanocrystals with a diameter between 2 and 10 nm and composed of II-VI or III-V elements. Because the radius of quantum dots is smaller than or close to the exciton Bohr radius, quantum dots have unique spectral properties that traditional organic dyes and fluorescent proteins do not have, such as wide and continuous excitation spectra, narrow and symmetrical emission spectra, and variable emission wavelengths. Tuning, high fluorescence stability, and strong anti-photobleaching performance have made quantum dots widely used in biochemical analysis and biomedicine. In recent years, a new method for the preparation of quantum dots wi...

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彭炳华丘杭娜
Owner GUANGXI TEACHERS EDUCATION UNIV
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