Preparation method for synthesizing CdSe/CdS core-shell structure quantum dots through one step

A technology of core-shell structure and quantum dots, which is applied in the field of preparation of metal oxide quantum dots, can solve the problems of difficult nanomaterial synthesis, long reaction time, and highly toxic raw materials, and achieve uniform size distribution, simple preparation method, and easy The effect of control

Inactive Publication Date: 2013-10-23
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The optical and electrical properties of quantum dots can be adjusted by coating a layer of shell structure on the surface of quantum dots, while avoiding the oxidation of the surface of quantum dots and improving their chemical stability. Currently, the commonly used method for preparing quantum dots with core-shell structure is alternating ion Injection method and organometallic pyrolysis method, although these two methods can realize the epitaxial growth of shell materials on the surface of CdSe nuclear quantum dots, and regulate the optical properties and surface stability of quantum dots, but using organometallic precursors to coat For Cd

Method used

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  • Preparation method for synthesizing CdSe/CdS core-shell structure quantum dots through one step
  • Preparation method for synthesizing CdSe/CdS core-shell structure quantum dots through one step
  • Preparation method for synthesizing CdSe/CdS core-shell structure quantum dots through one step

Examples

Experimental program
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Example Embodiment

[0025] Example 1:

[0026] Weigh 0.2842 g of selenium powder in a pear-shaped bottle, pour 2 ml of TOP into the pear-shaped bottle in an anhydrous and oxygen-free glove box, and seal it; remove the pear-shaped bottle from the glove box, and the Se powder can be dissolved after sonication. Prepare the TOPSe solution; weigh 0.018 g of cadmium ethylxanthate and 0.1032 g of cadmium stearate in a 10 ml centrifuge tube, and pour 1 ml of oleic acid, 1 ml of oleylamine and 3 ml of 10 ml into the centrifuge tube. Octene, ultrasonic, get the cadmium precursor; weigh 0.077 g of CdO powder and place it in a three-necked bottle, pour 1 ml of oleic acid (OA) and 8 ml of octadecene (ODE) into the three-necked bottle, and set up anhydrous Anaerobic system, pass high-purity Ar (99.999%), heat the solution in the three-necked flask to 280 ℃ after 30 minutes, and stop heating after the CdO is completely dissolved; add 1 g of TOPO and 6.4 ml of oleylamine into the three-necked flask and continue Af...

Example Embodiment

[0028] Example 2:

[0029] Weigh 0.1421 g of selenium powder in a pear-shaped bottle, pour 2 ml of tributyl phosphine (TBP) into the pear-shaped bottle in an anhydrous and oxygen-free glove box, and seal it; take out the pear-shaped bottle from the glove box and sonicate it. Se powder can be dissolved to prepare TBPSe solution; weigh 0.018 g of cadmium ethylxanthate and 0.1032 g of cadmium stearate in a 10 ml centrifuge tube, and pour 1 ml of oleic acid and 1 ml of Oleylamine and 3 ml octadecene, ultrasonic, get the cadmium precursor; weigh 0.077 g of CdO powder into a three-necked bottle, pour 1 ml of oleic acid (OA), 8 ml of octadecene (ODE) into the three-necked bottle Set up an anhydrous and oxygen-free system, pass high-purity Ar (99.999%), heat the solution in the three-necked flask to 280°C after 30 minutes, and stop heating when CdO is completely dissolved; take 1 g of TOPO and 6.4 ml of oleylamine Add to the three-necked flask, continue to pour Ar for about one hour, he...

Example Embodiment

[0030] Example 3:

[0031] Weigh 0.1421 g of selenium powder in a pear-shaped bottle, pour 2 ml of tributyl phosphine (TBP) into the pear-shaped bottle in an anhydrous and oxygen-free glove box, and seal it; take out the pear-shaped bottle from the glove box and sonicate it. Se powder can be dissolved to obtain TBPSe solution; weigh 0.036 g of cadmium ethylxanthate and 0.2064 g of cadmium stearate into a 10 ml centrifuge tube, and pour 2 ml of oleic acid and 3 ml of Oleylamine and 6 ml octadecene, ultrasonic, get the cadmium precursor; weigh 0.077 g of CdO powder into a three-necked flask, pour 1 ml of oleic acid (OA) and 8 ml of octadecene (ODE) into the three-necked flask Set up an anhydrous and oxygen-free system, pass high-purity Ar (99.999%), heat the solution in the three-necked flask to 280°C after 30 minutes, and stop heating when CdO is completely dissolved; take 1 g of TOPO and 2.4 g of 18 Add amine to the three-necked flask, continue to pour Ar for about one hour, hea...

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Abstract

The invention provides a preparation method for synthesizing CdSe/CdS core-shell structure quantum dots through one step. The preparation method comprises the following steps of: mixing cadmium precursor with oleic acid and octadecene, adding oleylamine and trioctylphousphine oxide (TOPO), and heating the solution in argon atmosphere; injecting trioctylphosphine compound precursor, adding Cd precursor composed of cadmium ethyl xanthate, and keeping the temperature, thereby obtaining CdS clad core-shell quantum dots. The prepared microparticles has the advantages of good crystallinity, even size distribution, controllable particle diameter and the like, and the obtained core-shell structure quantum dots are good in stability and high in fluorescence efficiency; the method has no pilot process so that the operation steps of synthesizing the core-shell structure quantum dots are simple and the cost is low, and a large batch of core-shell structure quantum dots can be synthesized at a time; as a result, group II-VI semiconductor nanomaterials are suitable for actual application, and even industrial batch production.

Description

technical field [0001] The invention relates to the preparation technology of metal oxide quantum dots, in particular to a preparation method of core-shell structure quantum dots. Background technique [0002] Quantum dot nanomaterials have properties such as quantum size effect, quantum interference effect, quantum tunneling effect, Coulomb blocking effect, and nonlinear optical effect, and have shown broad application prospects in solar cells, sensors, and biomedicine. In recent years, semiconductor quantum dots (such as CdSe, PbSe, etc.) have attracted the attention of researchers. For example, studies have shown that quantum dots of different sizes and materials have unique uses in the construction of optoelectronic devices and their performance adjustment. [0003] The optical and electrical properties of quantum dots can be adjusted by coating a layer of shell structure on the surface of quantum dots, while avoiding the oxidation of the surface of quantum dots and impr...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 葛美英尹桂林何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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