Method for preparing (Zn,Cd)S quantum dot

A technology of quantum dots and quantum dot solutions, applied in the field of semiconductor nanomaterial preparation, can solve the problems of complex preparation of inverse microemulsion systems or stencil solutions, poor operability and repeatability, and unfavorable industrial large-scale production, etc. To achieve the effect of easy large-scale industrial production, strong repeatability, and reduced preparation costs

Inactive Publication Date: 2014-01-01
WUHAN INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above two methods, the preparation of inverse microemulsion system or stencil solution is relatively complicated, the operability and repeatability are not strong, and a large amount of organic matter is discarded during the preparation process, which is easy to pollute the environment and is not conducive to the realization of large-scale industrial production
[0005] In summary, although there are many reports on the successful preparation of various quantum dots, how to obtain high-quality quantum dots while making the preparation process more green, low-cost, high-efficiency, and easy to achieve mass production is still an issue. to be further resolved

Method used

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  • Method for preparing (Zn,Cd)S quantum dot
  • Method for preparing (Zn,Cd)S quantum dot

Examples

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Effect test

Embodiment 1

[0032] Take Zn(Ac) 2· 2H 2 O (Analytical Pure) and C 2 H 5 NS (Analytical Pure) is the starting material, dissolved in a 3:1 water / ethanol mixture at a molar ratio of 1:1, and adjust the pH to 5 with glacial acetic acid. Zn 2+ The initial concentration of 0.2mol / L. Transfer the above mixed solution to an autogenous pressure hydrothermal reactor (stainless steel shell, Teflon lining) with a filling degree of 75%, and heat it to 80°C for constant temperature reaction for 2 hours. After cooling, the ZnS quantum dot solution is obtained. The average particle size is 2.3 nm. Centrifugally separate the ZnS quantum dot solution, wash it with absolute ethanol, and put it in a vacuum drying oven. After drying at 80°C, ZnS quantum dot powder can be obtained. The excitation and emission spectra are shown in the attached file. figure 1 And figure 2 .

Embodiment 2

[0034] Take ZnCl 2 (Analytical pure) and C 2 H 5 NS (analytical grade) is the starting material, dissolved in a 3:1 water / ethanol mixture at a molar ratio of 1:1.5, and adjust the pH to 5 with glacial acetic acid. Zn 2+ The initial concentration of 0.2mol / L. The isothermal reaction time is 3 hours, and other conditions are the same as in Example 1. After cooling, ZnS quantum dots are obtained, and the average particle size of ZnS is 3.3 nm.

Embodiment 3

[0036] Take Zn(NO 3 ) 2· 6H 2 O (Analytical Pure) and C 2 H 5 NS (Analytical Pure) is the starting material, dissolved in a 3:1 water / ethanol mixture at a molar ratio of 1:2, and adjust the pH to 5 with glacial acetic acid. Zn 2+ The initial concentration of 0.2mol / L. The isothermal reaction time is 6 hours, and other conditions are the same as in Example 1. After cooling, ZnS quantum dots are obtained, and the average particle size of ZnS is 6.1nm.

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Abstract

The invention relates to a method for preparing a (Zn,Cd)S quantum dot, which comprises the following steps of: (1) dissolving soluble salt of zinc or / and and cadmium and thioacetamide raw materials into water or water-ethanol mixed liquor and adjusting a pH value to weak acidity with weak acid to obtain homogeneous reaction system mother liquor; and (2) transferring the homogeneous reaction system mother liquor obtained in the step (1) into a hydrothermal reactor for automatically generating pressure for sealing, heating to 70-100 DEG C and reacting for 30minutes to 24 hours to obtain the (Zn,Cd)S quantum dot. Compared with the prior art, the invention has the advantages of low cost, controllable process and product property, high uniformity, energy saving, high efficiency, pure water phase preparation and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of preparation of semiconductor nanomaterials, in particular to a green preparation method of (Zn, Cd)S and doped quantum dots, in particular to an inorganic zinc source or / and cadmium source and thioacetamide A method for preparing sulfide and its doped quantum dots through homogeneous precipitation as a raw material under autogenous pressure reaction conditions. Background technique [0002] Quantum dots (Quantum dots, QDs) usually refer to semiconductor nanocrystal materials with a radius smaller than or close to the exciton Bohr radius. Nearly medium-sized proteins, much smaller than bacteria and biological cells. Since electrons and holes are quantum-confined, the continuous energy band structure becomes a discrete energy level structure with molecular characteristics, which can emit fluorescence after being excited. The II-VI wide bandgap quantum dots represented by (Zn, Cd)S quantum dots and their d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G11/02C09K11/56C01G9/08
Inventor 张占辉黄志良谷云乐
Owner WUHAN INSTITUTE OF TECHNOLOGY
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