Preparation method of CdHgTe alloy quantum dots

A technology of quantum dots and alloys, applied in the field of preparation of CdHgTe alloy quantum dots at room temperature in aqueous phase, can solve the problems of CdHgTe quantum dots not having hydrophilicity, complex operation process, unfavorable biomarkers, etc., and achieve easy control of process parameters and easy operation The effect of simple method and low cost

Active Publication Date: 2014-08-20
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The CdHgTe quantum dots synthesized in the organic phase are not hydrophilic, and must be exchanged into the water phase through ligand exchange before being applied to the biological system. The operation process is complicated and the conditions are high.
At present, CdHgTe quantum dots prepared by the aqueous phase synthesis method are rarely reported. Due to the special energy band gap and special nucleation mechanism of metallic mercury, high temperature will cause quantum dots to agglomerate and form nanorods, which is not conducive to biomarking.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The outstanding features of the present invention are further illustrated below through the examples, which are only intended to illustrate the present invention and in no way limit the present invention.

[0023] A kind of CdHgTe alloy quantum dot, it is composed of: tellurium powder (Te), cadmium chloride (CdCl 2 2.5H 2 O), mercury chloride (HgCl 2 ) mercaptopropionic acid (MPA), and the rest are aqueous solutions.

[0024] In the CdHgTe alloy quantum dots, tellurium powder (Te), cadmium chloride (CdCl 2 2.5H 2 O), mercury chloride (HgCl 2 ) The molar ratio of mercaptopropionic acid (MPA) was 0.5:1:2.4, the pH value of the solution was 9.5, and the ultraviolet light (346 lux illumination) was irradiated for 60 hours.

[0025] A kind of illumination-assisted room temperature preparation method of CdHgTe alloy quantum dot, its steps are:

[0026] 1. Prepare potassium tellurium hydride solution by reducing tellurium powder with potassium borohydride: weig...

Embodiment 2

[0035] A kind of CdHgTe alloy quantum dot, it is composed of: tellurium powder (Te), cadmium chloride (CdCl 2 2.5H 2 O), mercury chloride (HgCl 2 ) mercaptopropionic acid (MPA), and the rest are aqueous solutions.

[0036] In the CdHgTe alloy quantum dots, tellurium powder (Te), cadmium chloride (CdCl 2 2.5H 2 O), mercury chloride (HgCl 2 ) The molar ratio of mercaptopropionic acid (MPA) was 0.5:1:2.4, the pH value of the solution was 11.4, and the indoor natural light was irradiated for 50 days.

[0037] A kind of illumination-assisted room temperature preparation method of CdHgTe alloy quantum dot, its steps are:

[0038] 1. Prepare potassium tellurium hydride solution by reducing tellurium powder with potassium borohydride: weigh 0.3500g potassium borohydride (KBH 4) and 0.1600g tellurium powder (Te) in a test tube with a soft stopper, add 5mL of high-purity water to it, stopper the stopper, and react in an ice bath at -4°C for 6 or 7 or 8 hours. After the black...

Embodiment 3

[0046] A kind of illumination-assisted room temperature preparation method of CdHgTe alloy quantum dot, its steps are:

[0047] 1. Prepare potassium tellurium hydride solution by reducing tellurium powder with potassium borohydride: weigh 0.3500g potassium borohydride (KBH 4 ) and 0.064g tellurium powder (Te) in a test tube with a soft stopper, add 4mL high-purity water to it, stopper the stopper, and react in an ice bath at -4°C for 6 or 7 or 8 hours, until the black powder disappears, and the resulting solution is colorless Transparent, that is, 0.25mol / L potassium hydride telluride solution (KHTe);

[0048] 2. Weigh 4.568gCdCl 2 2.5H 2 O crystals were dissolved in 200mL high-purity water to obtain a 0.1mol / L cadmium chloride solution;

[0049] 3. Weigh another 5.43gHgCl 2 Crystal, dissolved in 200mL high-purity water to obtain 0.1mol / L mercuric chloride solution, pipette 20ml into 80ml cadmium chloride solution;

[0050] 4. Pipette 3mL of mercaptopropionic acid (0.1mol...

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PUM

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Abstract

The invention discloses a preparation method of CdHgTe alloy quantum dots. The method comprises the following steps: A, reducing tellurium powder through potassium borohydride to prepare a potassium hydrogen telluride solution, namely weighing potassium borohydride and the tellurium powder in a test tube with a soft plug respectively, and adding high-purity water; B, weighing CdCl2.2.5H2O crystals, and dissolving in the high-purity water to obtain a cadmium chloride solution; C, weighing HgCl2 crystals, and dissolving in the high-purity water to obtain a mercury chloride solution; D, adding transferred thiohydracrylic acid into a cadmium chloride and mercury chloride mixed solution, and adjusting the pH value by using a sodium hydroxide solution; E, removing dissolved oxygen, adding the potassium hydrogen telluride solution, continuously introducing nitrogen, and mixing; F, irradiating a raw solution by indoor light to obtain a solution of the CdHgTe alloy quantum dots at different wavebands; G, adding isopropanol for purifying, and freeze-drying to obtain solid powder of the CdHgTe alloy quantum dots. The process is simple and easy to control; raw materials are low in price and easily available; the synthesized CdHgTe alloy quantum dots are small in particle size and very good in biocompatibility and can be used for marking fixed cells.

Description

technical field [0001] The invention relates to the synthesis of fluorescent nanometer materials, more specifically to a method for preparing CdHgTe alloy quantum dots at room temperature in an aqueous phase. The synthesis conditions are mild, the quantum dots have small particle size and high stability, and can be used for labeling fixed cells. Background technique [0002] CdHgTe alloy quantum dots have become a research hotspot because of their mild synthesis conditions and high biocompatibility. The CdHgTe quantum dots synthesized in the organic phase are not hydrophilic, and must be exchanged into the water phase through ligand exchange before being applied to the biological system. The operation process is complicated and the conditions are high. At present, CdHgTe quantum dots prepared by aqueous phase synthesis are rarely reported. Due to the special energy band gap and special nucleation mechanism of metallic mercury, high temperature will cause quantum dots to aggl...

Claims

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Application Information

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IPC IPC(8): C09K11/89
Inventor 周培疆刘西京詹红菊
Owner WUHAN UNIV
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