Preparing method for CdSe@CdS core-shell structure quantum dots

A core-shell structure and quantum dot technology is applied in the field of preparation of CdSeCdS core-shell structure quantum dots, which can solve the problems of affecting the optoelectronic properties of nano-semiconductors, difficult to control product particle size, poor crystallinity of nano-particles, etc. , the effect of reducing the particle size of the product

Inactive Publication Date: 2016-05-18
FUZHOU UNIVERSITY
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Problems solved by technology

However, the nanoparticles prepared by the simple microemulsion method have poor crystallinity and many defects, which become non-radiative recombination centers and affect the optoelectronic properties of nano-semiconductors.
The hydrothermal method is a common method for preparing nanomaterials. It has the advantages of high particle purity and high crystallinity, but the size of the product particles is not easy to control and the unifo

Method used

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  • Preparing method for CdSe@CdS core-shell structure quantum dots
  • Preparing method for CdSe@CdS core-shell structure quantum dots
  • Preparing method for CdSe@CdS core-shell structure quantum dots

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Embodiment 1

[0022] The preparation method of the described CdSeCdS core-shell structure quantum dots, the specific steps are:

[0023] 1) Preparation of nuclear particle CdSe:

[0024] a. Weigh 0.016g selenium powder and 0.08gKBH 4 , added to 2 mL of secondary deionized water, and reacted for about 20 minutes under nitrogen protection to obtain a KHSe aqueous solution;

[0025] b. Prepare two microemulsions, microemulsion 1: 8.1mL cyclohexane, 6mL Tween 80, 9mL n-hexanol, 0.6mL 0.3M cadmium nitrate and 0.4M thiourea aqueous solution; microemulsion 2: 8.1mL cyclohexane , 6mL Tween 80, 9mL n-hexanol, 0.6mL0.1M KHSe aqueous solution;

[0026] c. Place the two parts of microemulsion in a constant temperature water bath at 30°C, and stir for 30 minutes under nitrogen protection until it becomes clear and transparent, then add microemulsion 2 dropwise to microemulsion 1 under stirring, and control the dropping rate to Two drops per second, the whole process is under the protection of nitroge...

Embodiment 2

[0029] The process is the same as Example 1, but the composition of the water phase of microemulsion 1 is changed to: 0.6mL of 0.2M cadmium nitrate and 0.4M thiourea aqueous solution to obtain CdSeCdS core-shell structure quantum dots with a core / shell molar ratio of 1:1.

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Abstract

The invention belongs to the technical field of preparation, and particularly relates to a preparing method for CdSe@CdS core-shell structure quantum dots. The preparing method includes the steps that CdSe quantum dots are synthesized in a microemulsion system containing thiourea, a selenium source and excessive Cd2+ ions, then hydro-thermal treatment is conducted on the reaction system, a CdS layer is formed on the surface of CdSe with S2- generated by thiourea decomposition through epitaxial growth, and then the CdSe@CdS core-shell structure quantum dots are formed. A microemulsion and a hydro-thermal treatment method are combined, one-step charging and two-stage reacting are adopted to prepare the CdSe@CdS core-shell structure quantum dots which are small and uniform in size, high in crystallization degree and good in monodispersity, the particle size is easy to control, technological operation is simple, and the requirement for equipment is low.

Description

technical field [0001] The invention belongs to the field of preparation of quantum dots, in particular to a preparation method of CdSeCdS core-shell structure quantum dots. Background technique [0002] The performance of quantum dot materials is not only related to its chemical composition, but also related to its particle size, uniformity of distribution, and crystallinity of particles. At present, the preparation methods of quantum dots mainly include microemulsion method, hydrothermal method, precipitation method, etc., among which the microemulsion method is the most commonly used method. The device is simple, easy to operate, and the product particle size is uniform. By adjusting the composition of the microemulsion, The size of the product can be easily and effectively controlled. However, the nanoparticles prepared by the simple microemulsion method have poor crystallinity and many defects, which become non-radiative recombination centers and affect the optoelectro...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/88B82Y20/00
CPCB82Y20/00C09K11/02C09K11/883
Inventor 沈水发万思李玲
Owner FUZHOU UNIVERSITY
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