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Preparation method of cadmium telluride quantum dot

A cadmium telluride quantum dot and quantum dot technology, applied in the direction of binary selenium/tellurium compounds, etc., can solve the problems of uneven particle size and wide emission peak, and achieve low price, mild reaction conditions, and good water solubility. Effect

Inactive Publication Date: 2010-12-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since this method starts heating and reflowing at room temperature, there is no obvious temperature limit for the nucleation and growth of quantum dots, so the particle size is not uniform and the emission peak width is large.

Method used

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  • Preparation method of cadmium telluride quantum dot
  • Preparation method of cadmium telluride quantum dot
  • Preparation method of cadmium telluride quantum dot

Examples

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Embodiment 1

[0025] A kind of preparation method of cadmium telluride quantum dot, will 0.8gNaBH 4 Add 0.16g tellurium powder into a 50mL Erlenmeyer flask, add 10mL deionized water, ventilate with nitrogen for 20min, immediately tighten the soft rubber stopper, insert a syringe needle, and stir magnetically for 2h to obtain milky white freshly prepared NaHTe solution. Take 0.5mL 200mmol / LCdCl 2 Stock solution, 0.5mL 200mmol / L freshly prepared mercaptopropionic acid solution, the molar ratio of the two is 1:1, add in another 50mL conical flask, add 14mL deionized water, then dropwise add 1mol / L NaOH solution, Adjust the pH to 12.0, blow nitrogen into the Cd precursor solution for 20 minutes, immediately tighten the soft rubber stopper, and insert a syringe needle; draw 0.2 mL of freshly prepared NaHTe solution with a 1 mL syringe, and quickly add it to the Erlenmeyer flask containing the Cd precursor solution At this time, the molar ratio of Cd to NaHTe is 1:0.167, put the Erlenmeyer flask...

Embodiment 2

[0027] A kind of preparation method of cadmium telluride quantum dot, will 0.8gNaBH 4 Add 0.16g tellurium powder into a 50mL Erlenmeyer flask, add 10mL deionized water, ventilate with nitrogen for 20min, immediately tighten the soft rubber stopper, insert a syringe needle, and stir magnetically for 2h to obtain milky white freshly prepared NaHTe solution. Take 0.5mL of 200mmol / L CdCl 2Stock solution, 1.0mL 200mmol / L freshly prepared mercaptopropionic acid solution, the molar ratio of the two is 1:2, add in another 50mL Erlenmeyer flask, add 14mL deionized water, then dropwise add 1mol / L NaOH solution, Adjust the pH to 12.0, blow nitrogen into the Cd precursor solution for 20 minutes, immediately tighten the soft rubber stopper, and insert a syringe needle; draw 0.2 mL of freshly prepared NaHTe solution with a 1 mL syringe, and quickly add it to the Erlenmeyer flask containing the Cd precursor solution At this time, the molar ratio of Cd to NaHTe was 1:0.167. Put the Erlenmeye...

Embodiment 3

[0029] A kind of preparation method of cadmium telluride quantum dot, will 0.8gNaBH 4 Add 0.16g tellurium powder into a 50mL Erlenmeyer flask, add 10mL deionized water, ventilate with nitrogen for 20min, immediately tighten the soft rubber stopper, insert a syringe needle, and stir magnetically for 2h to obtain milky white freshly prepared NaHTe solution. Take 0.5mL of 200mmol / L CdCl 2 Stock solution, 0.5mL 200mmol / L cysteamine solution freshly prepared, the molar ratio of the two is 1:1, put into another 50mL Erlenmeyer flask, add 14mL deionized water, then dropwise add 1mol / L NaOH solution, Adjust the pH to 6.5, blow nitrogen into the Cd precursor solution for 20 minutes, immediately tighten the soft rubber stopper, and insert a syringe needle; draw 0.2mL of freshly prepared NaHTe solution with a 1mL syringe, and quickly add it to the Erlenmeyer flask containing the Cd precursor solution At this time, the molar ratio of Cd to NaHTe is 1:0.167, put the Erlenmeyer flask into ...

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Abstract

The invention relates to a preparation method of a cadmium telluride quantum dot, which comprises the following steps: using CdCl2 as the Cd source, Te powder as the Te source and water as the solvent to respectively prepare Cd and Te precursor solutions; using mercaptopropionic acid as the stabilizer for quantum dot generation; and then, mixing the Cd and Te precursor solutions, and heating in water bath for reaction to obtain the CdTe quantum dot. Compared with the prior art, the invention has the following advantages: the reagents are low in price, have stable properties in air and can react without special instruments and equipment by simple operation, and the prepared CdTe quantum dot has favorable water solubility, dispersibility and stable fluorescence.

Description

technical field [0001] The invention relates to a method for preparing nanometer materials, in particular to a method for preparing cadmium telluride quantum dots. Background technique [0002] Quantum dots (QDs), also known as semiconductor nanocrystals, have a radius smaller than or close to the exciton Bohr radius, and are mainly composed of II-VI elements such as CdTe, CdSe or III-V elements such as GaAs and InP. . [0003] There are two types of quantum dots: hydrophobic and hydrophilic. In order to adapt to the hydrophilic physiological environment of biomolecules, cells, and tissues, almost all quantum dots used in the biomedical field have been modified by hydrophilicity, and have active groups such as amino groups and carboxyl groups to facilitate integration with proteins. , nucleic acid and other biomolecules coupling. The particle size of quantum dots is very small. The size of CdSe quantum dots commonly used in biomarkers is usually 1.8-7.0nm, and the size of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04
Inventor 潘敏牛婉婷张路遥陈裕泉
Owner ZHEJIANG UNIV
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