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Method for synthesizing rare earth Tm-doped CdTe:Tm quantum dot by hydrothermal method

A hydrothermal method and quantum dot technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of poor fluorescence stability of CdTe quantum dots, high toxicity of CdTe quantum dots, and limited quantum Point application and other issues, to achieve the effect of adjustable fluorescence emission wavelength, low cost, and low toxicity

Inactive Publication Date: 2014-03-12
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 small molecules of thioglycolic acid as a modifier, which makes the prepared CdTe quantum dots have poor fluorescence stability and poor biocompatibility.
In addition, 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

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Embodiment 1

[0019] A kind of hydrothermal synthesis rare earth Tm-doped CdTe: the method for Tm 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 75°C for 60min to obtain sodium telluride hydride NaHTe solution for later use;

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

[0023] 0.02mmol CdCl 2 , 0.001mmol Tm 2 o 3 Dissolve 0.02mmol N-acetyl-L-cysteine ​​in 40mL distilled water, adjust the pH value to 7.0 with 1mol / L NaOH solution, under nitrogen protection, add 50mL sodium hydride telluride NaHTe solution prepared in step 1, mix well Then transferred to a hydrothermal reaction kettle, heated to 185°C and reacted for 60 minutes to obtain 40mL rare earth Tm-doped CdTe:Tm quantum dot solution with adjustable fluorescence emission wavelength and h...

Embodiment 2

[0025] A kind of hydrothermal synthesis rare earth Tm-doped CdTe: the method for Tm 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 40min to obtain sodium telluride hydride NaHTe solution for later use;

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

[0029] 0.4mmol CdBr 2 , 0.06mmol Tm 2 o 3 Dissolve 0.8mmol N-acetyl-L-cysteine ​​in 20mL distilled water, adjust the pH value to 8.0 with 1mol / L NaOH solution, under nitrogen protection, add 2mL sodium telluride hydride NaHTe solution prepared in step 1, mix well Then transferred to a hydrothermal reaction kettle, heated to 190 ° C for 40 minutes, and 22 mL of rare earth Tm-doped CdTe:Tm quantum dot solution with adjustable fluorescence emission wavelength and high fluorescenc...

Embodiment 3

[0031] A kind of hydrothermal synthesis rare earth Tm-doped CdTe: the method for Tm 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 20min to obtain sodium telluride hydride NaHTe solution for later use;

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

[0035] 1.4mmol CdI 2 , 0.42 mmol Tm 2 o 3 Dissolve 4.2mmol of N-acetyl-L-cysteine ​​in 70mL of distilled water, adjust the pH value to 9.5 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 for 15 minutes to obtain 78mL rare earth Tm-doped CdTe:Tm quantum dot solution with adjustable fluorescence emission wav...

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Abstract

The invention discloses a method for synthesizing a rare earth Tm-doped CdTe:Tm quantum dot by a hydrothermal method. The preparation method comprises the following operation steps: injecting a previously prepared NaHTe solution in a previously prepared mixed solution of cadmium salt, thulium oxide and a water-soluble N-acetyl-L-cysteine modifier under nitrogen protection to obtain a rare earth Tm-mixed CdTe precursor solution, then putting the precursor solution in a hydrothermal reaction kettle for reaction to prepare the rare earth Tm-doped CdTe:Tm quantum dot with adjustable fluorescence emission wavelength and high fluorescence quantum yield. The hydrothermal method has the advantages of low cost, simplicity and convenience in operation, environmental protection and the like. The obtained rare earth Tm-doped CdTe:Tm quantum dot has the advantages of excellent fluorescence performance, great biologic compatibility and low toxicity and can be widely used in the fields of biochemical analysis and biomedicine as a novel fluorescent nanometer probe.

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:Tm quantum dots doped with rare earth Tm 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 special quantum size effects, surface effects and superior fluorescence properties. 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 wi...

Claims

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Application Information

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IPC IPC(8): C09K11/88B82Y20/00B82Y30/00B82Y40/00
Inventor 肖琦黄珊苏炜盛家荣彭炳华冯金荣
Owner GUANGXI TEACHERS EDUCATION UNIV
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