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Hydro-thermal preparation method for novel near infrared water-soluble copper-indium-sulfur three-element quantum dots

A ternary quantum dot, copper indium sulfide technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as inability to be directly applied in the field of biomedicine, difficult to control segmented heating, complicated operation steps, etc. The effect of low equipment requirements and huge application prospects

Inactive Publication Date: 2012-06-27
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The emission wavelength of the quantum dots prepared by this method can be adjusted within a certain range, but there are many types of organic solvents used, the cost is high, and the operation steps are complicated, and the segmental heating is difficult to control.
In addition, the quantum dots obtained by these two types of methods are all carried out in organic solvents, and the obtained quantum dots are all water-insoluble and cannot be directly applied to the biomedical field.

Method used

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  • Hydro-thermal preparation method for novel near infrared water-soluble copper-indium-sulfur three-element quantum dots
  • Hydro-thermal preparation method for novel near infrared water-soluble copper-indium-sulfur three-element quantum dots
  • Hydro-thermal preparation method for novel near infrared water-soluble copper-indium-sulfur three-element quantum dots

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Experimental program
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Effect test

Embodiment 1

[0015] Water-soluble copper indium sulfide (CuInS 2 ) The preparation of quantum dots is divided into the following steps:

[0016] A. Take 0.15mmol of copper dichloride (0.02017 grams) and indium trichloride tetrahydrate (0.04397 grams) and dissolve them together in 10.5ml of water, stir for 15 minutes to obtain Cu containing the same amount of substances 2+ and In 3+ of aqueous solution.

[0017] B. Add 156 μL of 3-mercaptopropionic acid to the above solution at room temperature, and stir for 5 minutes to form small yellow particles, which can be more evenly dispersed in the aqueous solution.

[0018] C. Slowly add 2mol / L NaOH solution to the above-obtained system to dissolve all the small yellow particles to obtain a transparent solution, and continue to drop NaOH solution to bring the pH value of the reaction system to 11.2, and then stir for 10 minutes. The resulting solution is light Red or colorless transparent solution, indicating Cu 2+ and In 3+ A coordination co...

Embodiment 2

[0024] Preparation of 2-mercaptosuccinic acid as copper indium sulfide (CuInS 2 ) quantum dots.

[0025] A. Cu with the same concentration of the substance 2+ and In 3+ The preparation of the aqueous solution, is with embodiment 1 step A.

[0026] B. At room temperature, add 1.8 mmol (about 0.2824 grams) of 2-mercaptosuccinic acid powder to the above solution, and stir for 15 minutes to completely dissolve the mercaptosuccinic acid powder in water.

[0027] C. Add 2mol / L NaOH solution dropwise to the above solution, and adjust the pH value to 11.2. During this process, the solution first gradually changes from light yellow transparent to white turbid state, and finally returns to colorless transparent state, and then stir for 15 minutes. .

[0028] D. Add 0.3mmol (0.0228g) of thiourea to the above C solution, stir for 15 minutes to dissolve it completely, then transfer it to a 15mL reaction kettle, and heat it at 150°C for 21 hours to obtain water-soluble copper Indium Su...

Embodiment 3

[0032] Preparation of higher concentration copper indium sulfur (CuInS 2 ) quantum dot solution.

[0033] A. 0.40mmol copper dichloride (0.05379 grams) and 0.40mmol (0.1173 grams) indium trichloride tetrahydrate were dissolved in 10.5ml water, stirred for 15 minutes to obtain 2+ and In 3+ of aqueous solution.

[0034] B. Add 416 μL of 3-mercaptopropionic acid to the above solution at room temperature, and stir for 15 minutes to form small yellow particles, which can be more evenly dispersed in the aqueous solution.

[0035] C. Add NaOH solution to the solution obtained in step B to adjust the pH value to 11.2, the same as step C in Example 1.

[0036] D. Add 0.8mmol (0.0608g) thiourea to the above solution, stir for 20 minutes to dissolve it completely, transfer it to a 15mL reaction kettle, and heat at 150°C for 21 hours to obtain water-soluble CuInS 2 Quantum dots, the resulting quantum dot solution is a yellow transparent solution;

[0037] E. Add ethanol solution to t...

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Abstract

The invention belongs to the technical field of quantum dot preparation, and specifically to a method for preparing copper-indium-sulfur (CuInS2) three-element quantum dots under a hydro-thermal condition. According to the method, common metal salt compounds such as copper chloride and indium chloride, and a sulfhydryl-containing carboxylic acid such as mercaptopropionic acid and mercaptosuccinic acid are adopted to synthesize copper-indium-sulfur (CuInS2) nanoparticles with the particle size of 2-4 nm and emission wavelength in the near infrared region under the hydro-thermal condition. Compared to other organic phase synthesis of the near infrared quantum dots, the method of the present invention has characteristics of less variety of the raw materials, cheap price, simple method, easy operation, good repeatability, and low requirements on equipment. Compared to the traditional quantum dots, the synthesized water-soluble quantum dots of the present invention have the following advantages that: the synthesized water-soluble quantum dots do not contain mercury, cadmium and other toxic metal elements, the emission peak is located in the near infrared region, the synthesized water-soluble quantum dots provide strong penetrabilities for cells and other biological tissues, and the synthesized water-soluble quantum dots can be widely used in immunological assays, nucleic acid hybridizations, gene analysis, cell classification and imaging and other fields.

Description

technical field [0001] The invention belongs to the technical field of preparation of quantum dots, in particular to a method for preparing copper indium sulfur (CuInS) under hydrothermal conditions. 2 ) method of ternary quantum dots. Background technique [0002] Quantum dots, also known as semiconductor nanoparticles, have made great research progress in the past two decades. Due to their unique photophysical and photochemical properties, quantum dots are widely used in biomolecular labeling, drug recognition, heavy metal detection, and cell imaging. [0003] Compared with traditional organic dyes and fluorescent proteins, quantum dots have unique advantages in many aspects: tunable fluorescence, high quantum yield, wide excitation wavelength range, symmetrical emission peak and half-width Narrow, and good photochemical stability. However, the emission wavelengths of most known quantum dots are in the visible light region, and the fluorescence signal is sharply weakene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/62
Inventor 苏星光刘思宇
Owner JILIN UNIV
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