Method for rapidly preparing water-soluble quantum dot by ultrasonic spraying method

An ultrasonic spray, water-soluble technology, used in chemical instruments and methods, luminescent materials, etc., can solve problems such as limiting large-scale applications, and achieve the effect of large-scale production.

Inactive Publication Date: 2009-09-09
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For a closed reaction system, it is difficult to achieve it by conventional stirring methods. In order to avoid precipitation during the reaction, the concentration of the precursor used is much lower than that of the reaction at a lower temperature under normal pressure, which also limits its large-scale application. application

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  • Method for rapidly preparing water-soluble quantum dot by ultrasonic spraying method

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Effect test

Embodiment 1

[0025] (1) Add cadmium nitrate and thioglycolic acid in sequence in deionized water, so that the molar ratio of cadmium nitrate and thioglycolic acid is 1:50. After the complexation reaction is completed, add sodium hydride telluride equimolar to cadmium nitrate to obtain water-soluble quantum point precursor solution, the final concentration of cadmium ion is 10 -5 M.

[0026] (2) Add the precursor solution obtained in step (1) to an ultrasonic atomizer. After ultrasonic atomization, the precursor solution exists in the form of submicron droplets to obtain the precursor solution of water-soluble quantum dots. mist.

[0027] (3) Feed in nitrogen, the flow rate of nitrogen gas is 5L / min, and the droplets of the precursor solution obtained in step (2) are brought into the temperature-stabilized reaction device, and the droplets of the precursor solution are heated (the temperature is 450° C. ) reaction, and the reaction product is absorbed by water to obtain water-soluble cadm...

Embodiment 2

[0029] (1) Add cadmium nitrate and thioglycolic acid sequentially in deionized water, so that the molar ratio of cadmium nitrate and thioglycolic acid is 1:3. After the complexation reaction is completed, add sodium hydride telluride equivalent to cadmium nitrate to obtain water-soluble quantum point precursor solution, the final concentration of cadmium ions was 5×10 -2 M.

[0030] (2) Add the precursor solution obtained in step (1) to an ultrasonic atomizer. After ultrasonic atomization, the precursor solution exists in the form of submicron droplets to obtain the precursor solution of water-soluble quantum dots. mist.

[0031](3) Feed in nitrogen, the flow of nitrogen gas is 3L / min, and the droplets of the precursor solution obtained in step (2) are brought into the temperature-stabilized reaction device, and the droplets of the precursor solution are heated (the temperature is 250° C. ) reaction, and the reaction product is absorbed by water to obtain water-soluble cadmi...

Embodiment 3

[0033] (1) Add zinc acetate and thioglycolic acid in sequence in deionized water, so that the molar ratio of zinc acetate to thioglycolic acid is 1:20. After the complexation reaction is completed, add sodium hydride telluride equimolar to zinc acetate to obtain water-soluble quantum Dot precursor solution, the final concentration of zinc ions is 3×10 -2 M.

[0034] (2) Add the precursor solution obtained in step (1) to an ultrasonic atomizer. After ultrasonic atomization, the precursor solution exists in the form of submicron droplets to obtain the precursor solution of water-soluble quantum dots. mist.

[0035] (3) Feed in nitrogen, the flow rate of nitrogen gas is 1L / min, and the droplets of the precursor solution obtained in step (2) are brought into the temperature-stabilized reaction device, and the droplets of the precursor solution are heated (the temperature is 110° C. ) reaction, and the reaction product is absorbed by water to obtain water-soluble zinc telluride f...

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Abstract

The invention relates to a method for rapidly preparing a water-soluble quantum dot by an ultrasonic spraying method with continuous production, which comprises the following steps that: cadmium ions or zinc ions and hydrogen (or selenide) telluride or sodium hydrogen telluride (or selenide) react to obtain a precursor solution of cadmium (zinc) telluride (selenide) through the complexation of a mercapto compound. An ultrasonic atomizer is used to atomize the precursor solution to form fogdrops of the precursor solution, and the fogdrops flow through a device with constant temperature to react to obtain the water-soluble quantum dot. The method has the advantages of high speed and continuous quantum dot production, the prepared quantum dot has high fluorescence quantum yield (between 20 and 50 percent), and good monochromaticity of luminescence (the peak width at half height of a fluorescence spectrum within the range of visible light is between 30 and 40nm), and the size of nano-particles can be easily controlled by changing the temperature and flow rate, thereby realizing the adjustment to luminescence peak positions (between 400 and 700nm).

Description

technical field [0001] The invention relates to a method for rapidly preparing water-soluble quantum dots by an ultrasonic spray method with continuous production. Background technique [0002] Quantum Dot is a zero-dimensional electronic system. When the size of the material is smaller than its exciton Bohr radius, the quantum size effect will appear, and its energy level structure will change with the change of size. When the size of semiconductor nanoparticles is close to its electron-hole radius, due to the quantum confinement effect of the electron wave function, the effective bandgap of the energy band of semiconductor nanoparticles increases with the decrease of the radius of the particle, resulting in blue absorption and fluorescence spectra. shift. The spectral properties mainly depend on the size of the radius of the semiconductor nanoparticles, but not on the composition. [0003] The application of quantum dots in biological detection is a research hotspot in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/54
Inventor 陈东唐芳琼李红博闫传苗孟宪伟
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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