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Prepn of CdSe/CdS or CdSe/ZnS core-shell quantum dot

A technology of quantum dots and stock solution, applied in the field of preparation of core/shell quantum dots, can solve the problems of high toxicity of metal organics, harsh equipment conditions, easy explosion, etc., and achieve low price, good stability, and improved fluorescence properties. Effect

Inactive Publication Date: 2003-03-19
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since Cd(CH 3 ) 2 , Zn(CH 3 ) 2 Such metal organic compounds are highly toxic, unstable, and explosive. Therefore, it is extremely dangerous to use these compounds as raw materials, and the required equipment conditions are harsh.

Method used

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  • Prepn of CdSe/CdS or CdSe/ZnS core-shell quantum dot
  • Prepn of CdSe/CdS or CdSe/ZnS core-shell quantum dot
  • Prepn of CdSe/CdS or CdSe/ZnS core-shell quantum dot

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Embodiment Construction

[0019] The preparation of CdSe / CdS or CdSe / ZnS core / shell quantum dots is divided into two parts: (a) preparation of CdSe single quantum dots, (b) preparation of core / shell quantum dots by coating CdS or ZnS on the outside of CdSe.

[0020] The preparation of CdSe / CdS or CdSe / ZnS core / shell type quantum dots specifically includes the following steps: (a) in a glove box, 0.1g of selenium powder is dissolved in 0.54g of tri-n-octylphosphine (TOP) and 2.1 In g dioctylamine, make the stock solution of selenium, with 50ul sulfide bis(trimethylsilyl)[(TMS) 2 S] be dissolved in 0.4g tri-n-octylphosphine (TOP) and 1.6g dioctylamine, make the stock solution of sulfide; (b) take by weighing 0.0165gCdO and 0.28g stearic acid and put into four Schlenk In the reaction vessel A, use Schlenk technology, vacuumize with a vacuum pump and then fill it with Ar gas, repeat degassing six times so that the reaction vessel is filled with Ar gas, then heat to 150°C and keep it for about 25 minutes to...

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Abstract

The present invention discloses the preparation process of CdSe / CdS, CdSe / ZnS and other II-VI type core-shell quantum dot. The CdSe / CdS and CdSe / ZnS core-shell quantum dot are prepared with cadmium acetate, zinc acetate or other inorganic compound, instead of Cd(CH3)2, Zn(CH3)2 or other inflammable, detonable and expensive organic metal compound, as material. The prdouct has excellent single dispersivity, improved fluorescent property, high quantum yield, high stability, and may be used widely as the fluorescent mark for biological detection and analysis.

Description

technical field [0001] The invention relates to a method for preparing CdSe / CdS, CdSe / ZnS and other core / shell quantum dots. Background technique [0002] Quantum dots are semiconductor nanocrystals with a radius smaller than or close to the exciton Bohr radius. Due to their unique quantum size effect and surface effect, they have broad application prospects in luminescent materials and photosensitive sensors. CdSe, CdS and other type II-VI quantum dots have special and excellent fluorescence emission properties in the visible light region. They have strong fluorescence intensity, slow bleaching rate, narrow fluorescence spectrum, high sensitivity, and continuous distribution of excitation spectrum. The peak position of fluorescence spectrum can be passed Change the size of quantum dots to adjust, and the emission spectrum of many II-VI quantum dots, such as CdS, CdSe, CdTe, etc., spans the visible spectrum region, and different quantum dots can be simultaneously excited at ...

Claims

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Application Information

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IPC IPC(8): C01G11/00C01G11/02C09K11/54C30B7/00
Inventor 庞代文谢海燕侯安新
Owner WUHAN UNIV
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