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Preparation method of water soluble cadmium sulfide quantum dots

A technology of cadmium sulfide and quantum dots, which is applied in the fields of cadmium sulfide, chemical instruments and methods, nanotechnology for materials and surface science, etc. The method is simple and controllable, the reaction conditions are mild, and the raw materials are cheap and easy to obtain.

Inactive Publication Date: 2015-09-02
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the methods for synthesizing cadmium sulfide quantum dots mainly include electrochemical methods, thermal injection methods, ion exchange methods, and hydrothermal methods. Converted to water-soluble quantum dots
At present, there are few methods for synthesizing water-soluble cadmium sulfide quantum dots. The reasons are: (1) the synthesized quantum dots are unstable and easy to agglomerate without surfactant; (2) the crystallinity is not good, which limits its (3) The yield is low, it is difficult to apply in industrial production

Method used

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  • Preparation method of water soluble cadmium sulfide quantum dots
  • Preparation method of water soluble cadmium sulfide quantum dots

Examples

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Effect test

Embodiment 1

[0012] (1) Add 2.820g cadmium chloride to 200mL absolute ethanol, stir until completely dissolved, add 1.602g thioacetamide to 200mL absolute ethanol, stir until completely dissolved, slowly add cadmium chloride solution to thioethyl In the amide solution, ultrasonication for 10 minutes forms the precursor;

[0013] (2) Take 300mL of precursor, add 300mL of high-purity water under stirring conditions, react the mixture of the two at 40°C for 8 hours, centrifuge at a centrifugal rate of 13000r / min after the reaction, and use absolute ethanol and high-purity water to centrifuge the product Alternately washed three times and dried to obtain water-soluble cadmium sulfide quantum dots.

[0014] From figure 1 It can be seen that the crystal type of the water-soluble cadmium sulfide quantum dots synthesized by this method is amorphous. From figure 2 It can be seen that the cadmium sulfide quantum dots synthesized by this method have a very small particle size, less than 5nm, and ...

Embodiment 2

[0016] (1) Add 2.820g cadmium chloride to 200mL absolute ethanol, stir until completely dissolved, add 1.602g thioacetamide to 200mL absolute ethanol, stir until completely dissolved, slowly add cadmium chloride solution to thioethyl In the amide solution, stir for 10 minutes to form a precursor;

[0017] (2) Take 300mL of precursor, add 300mL of high-purity water under stirring conditions, and react the mixture of the two at 4°C for 24 hours. Alternately washed three times and dried to obtain water-soluble cadmium sulfide quantum dots.

Embodiment 3

[0019] (1) Add 2.820g cadmium chloride to 200mL absolute ethanol, stir until completely dissolved, add 1.602g thioacetamide to 200mL absolute ethanol, stir until completely dissolved, slowly add cadmium chloride solution to thioethyl In the amide solution, stir for 10 minutes to form a precursor;

[0020] (2) Take 300mL precursor, add 300mL high-purity water under stirring conditions, react the mixture of the two at 80°C for 8 hours, centrifuge at a centrifugal speed of 13000r / min after the reaction, and use absolute ethanol and high-purity water to centrifuge the product Alternately washed three times and dried to obtain water-soluble cadmium sulfide quantum dots.

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Abstract

The invention discloses a preparation method of water soluble cadmium sulfide quantum dots. The preparation method comprises the following steps: respectively dissolving cadmium salt and a sulfocompound in an organic solvent as a cadmium source and a sulfur source, and mixing the cadmium source with the sulfur source under an ultrasonic or stirring condition to react to form a precursor; adding high pure water, an aqueous solution containing a surfactant or an aqueous solution containing protein into the formed precursor; and then carrying out reaction on the mixture for 8-24 hours at 4-80 DEG C to prepare the water soluble cadmium sulfide quantum dots. Compared with a conventional preparation method of cadmium sulfide quantum dots, the preparation method disclosed by the invention is simple and controllable, mild in reaction condition, easily available in raw material and environment-friendly, and the prepared product has good fluorescence.

Description

technical field [0001] The invention belongs to the technical field of synthesis of inorganic functional material cadmium sulfide, and in particular relates to a preparation method of water-soluble cadmium sulfide quantum dots. Background technique [0002] Quantum dots, also known as nanocrystals, generally have a particle size between 1-10nm. Since electrons and holes are quantum-confined, the continuous energy band structure becomes a discrete energy-level structure with molecular characteristics. Can emit fluorescence. Due to the quantum size effect, surface effect, and macroscopic quantum tunneling effect, quantum dots have incomparable photoelectric properties of bulk materials and have become a research hotspot. Based on quantum effects, quantum dots have broad application prospects in the fields of solar cells, light-emitting devices, and optical biomarkers. Cadmium sulfide quantum dots are a common quantum dot with unique photoelectrochemical properties, and are w...

Claims

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Application Information

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IPC IPC(8): C01G11/02C09K11/56B82Y30/00
Inventor 马晓明双微杨林梁慧君王歌王晓兵刘福园王魁郭玉明杨改
Owner HENAN NORMAL UNIV
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