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Method for synthesizing quantum dot with uniform size distribution in aqueous phase

A technology of particle size distribution and quantum dots, which is applied in chemical instruments and methods, binary selenium/tellurium compounds, luminescent materials, etc., can solve the problem of uneven particle size distribution of quantum dots, poor water solubility of quantum dots, and difficulty in application, etc. problem, to achieve the effect of low toxicity, good biophilicity and good monochromaticity

Inactive Publication Date: 2010-05-12
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The quantum dots prepared by this method have poor water solubility and are difficult to be applied in biological probes and biomarkers
Moreover, the drugs used in the synthesis method in the organic phase are very toxic and expensive, and the synthesis temperature is usually above 300°C. The steps are complicated, difficult to control, and the pollution is relatively large.
In addition, the quantum dots synthesized purely in the aqueous phase, because the reaction speed in the aqueous solution is too fast, the particle size distribution of the obtained quantum dots is usually not very uniform

Method used

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  • Method for synthesizing quantum dot with uniform size distribution in aqueous phase
  • Method for synthesizing quantum dot with uniform size distribution in aqueous phase

Examples

Experimental program
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Embodiment 1

[0026] The first step is to prepare template agent

[0027] Prepare P123 tri-block polymer mother solution. Weigh 0.14 g of a P123 tri-block polymer with a molecular weight of 8400 in a beaker. Then add 200 mL of deionized water; stir for 120 minutes until a uniform colorless and transparent solution is formed; take out 2 mL and dilute to 180 mL.

[0028] The second step is to prepare the precursor of cadmium-mercapto complex

[0029] Weigh 0.0228g CdCl 2 2.5H 2 O was dissolved in 10mL deionized water to form a colorless and transparent solution, which was added dropwise to the solution prepared in the first step, and stirred for 2 hours, the solution was still colorless and transparent; Acetic acid (TGA) 1.4×10 -2 mL, a white insoluble matter will be produced immediately. After fully stirring, adjust the pH value of the solution to 8 with 10 mL of 1 mol / L NaOH solution to form a colorless, transparent and clear solution.

[0030] The third step is to prepare the S sourc...

Embodiment 2

[0035] The first step is to prepare template agent

[0036] Prepare polyethylene glycol stock solution. Weigh 0.122 g of polyethylene glycol with a molecular weight of 5000 in a beaker. Then add 200 mL of deionized water; stir for 120 minutes until a uniform colorless and transparent solution is formed; take out 2 mL and dilute to 180 mL.

[0037] The second step is to prepare the precursor of cadmium-mercapto complex

[0038] Weigh 0.0336g CdCl 2 2.5H 2 O was dissolved in 10 mL of deionized water to form a colorless and transparent solution. Add this solution dropwise to the solution prepared in the first step, and stir for 2 hours; the solution is still colorless and transparent; slowly add thioglycolic acid (TGA) 1.9×10 -2 mL, a white insoluble matter will be produced immediately. After fully stirring, use 12 mL of 1 mol / L NaOH solution to adjust the pH value of the solution to 8.5 to form a colorless, transparent and clear solution.

[0039] The third step is to prep...

Embodiment 3

[0044] The first step is to prepare template agent

[0045] Weigh 4.54×10 -5 g of sodium dodecylsulfonate (SDS) was dissolved in a small amount of deionized water and diluted to 180 mL.

[0046] The second step is to prepare the precursor of cadmium-mercapto complex

[0047] Weigh 0.0230g Cd(Ac) 2Dissolve in 10mL deionized water to form a colorless and transparent solution, add the solution dropwise to the solution prepared in the first step, stir for 1.5 hours, the solution is still colorless and transparent; add reduced glutathione to the solution 0.3073g, white insoluble matter is produced immediately, after fully stirring, use 1mol / L NaOH solution 18mL to adjust the pH value of the solution to 9, forming a colorless transparent clear solution.

[0048] The third step is to prepare the Se source precursor

[0049] In a small beaker add 9.0792×10 -3 g NaBH 4 , 4.7376×10 -3 g Se and 6mL deionized water, and ultrasonically reacted for 2.5 hours under a water seal, the u...

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Abstract

The invention discloses a method for synthesizing quantum dots with uniform size distribution in an aqueous phase, which comprises the following steps: firstly, dissolving amphiphilic high polymers of different varieties into water so as to form regular micelles when the concentration of the high polymers in the aqueous phase is higher than the critical concentration of the high polymers; and reacting a cadmium sulfydryl composite precursor with NaHSe, NaHTe and Na2S or a thiourea precursor in pore paths of the formed micelles to synthetize quantum dots such as CdS, CdSe, CdTe and the like, and forming the quantum dots with the uniform size distribution by utilizing condensation reflux or the growth of the quantum dots in a hydrothermal reaction kettle. The quantum dots synthesized in the aqueous phase completely are good in water-solubility, and thus the quantum dots can be widely applied in biological aspects and can be widely applied to biomarkers, biological labels and probes; and in addition, the quantum dots with the uniform size distribution have excellent monochromaticity of transmitted fluorescence, wide absorption and narrow and adjustable transmitting positions.

Description

technical field [0001] The present invention relates to the technical field of synthesizing nanomaterials with specific morphology, specifically, when the concentration of high polymers in the aqueous solution exceeds its own critical concentration in the aqueous phase, regular micelles can be formed, and in the micelles The method of synthesizing quantum dots with the same particle size distribution as the micelle diameter and different emission wavelengths and fluorescence intensities is also called nano-reactor (nano-reactor) technology. Background technique [0002] Quantum dots, also known as nanocrystals, are nanoparticles composed of II-VI or III-V elements. The particle size of quantum dots is generally between 1 and 10 nm. Since electrons and holes are quantum-confined, the continuous energy band structure becomes a discrete energy level structure with molecular characteristics, and can emit fluorescence after being excited. Because the optical properties of quantu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04C01G11/02C09K11/88C09K11/56
Inventor 丁旵明李勇曲雅妮
Owner EAST CHINA NORMAL UNIV
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