Aqueous phase preparation method of water-soluble core/shell-type CdTe/Cd(OH)2 nano-crystal

A technology for the preparation of nanocrystalline grains and aqueous phases, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of harsh preparation conditions, affecting quantum yield, and high toxicity, and achieve simple reaction conditions, safe and convenient operation, and production low cost effect

Inactive Publication Date: 2009-08-05
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of harsh preparation conditions, complex reaction steps, high reagent cost, high toxicity, cumbersome aqueous phase transfer steps, and quantum production of the quantum dot aqueous solution obtained in the existing quantum dot metal organic chemistry method. The efficiency and stability are greatly reduced; at the same time, it solves the problem that the quantum dots prepared by the aqueous phase synthesis method are easy to oxidize, unstable, and have a large number of defects on the surface, which seriously affects their quantum yield.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (a) In a closed reaction vessel with a needle syringe, add 16.3 mg KBH 4 , 19.2mgTe and 1.2mL of double-distilled water, reacted at room temperature for 50min under magnetic stirring, and obtained a light purple transparent liquid, that is, fresh anaerobic KHTe aqueous solution;

[0017] (b) Into the 250mL three-necked bottle, add the prepared CdCl 2 and an aqueous solution of L-cysteine ​​(take 15mL of 0.02mol L -1 CdCl 2 Aqueous solution in a beaker, add 25mL double distilled water and 0.0007mol L-cysteine, with 5mol L -1 NaOH aqueous solution to adjust the pH at about 11.20), protected by argon, and stirred for 30min;

[0018] (c) Add an appropriate amount of the KHTe aqueous solution freshly prepared in a to b, keeping the molar ratio of Cd:Te:L-cysteine ​​at 2:1:4.8.

[0019] (d) The mixed solution in c was heated to 96° C. and refluxed for 15 minutes. Centrifuge and take the supernatant to obtain CdTe quantum dots with relatively uniform scale.

[0020] (e) ...

Embodiment 2

[0022] (a) In a sealed reaction vessel with a needle syringe, add 51.5 mg KBH 4 , 57.4mgTe and 3mL of double-distilled water, reacted at room temperature under magnetic stirring for 70min, and obtained a light purple transparent liquid, that is, a fresh oxygen-free KHTe aqueous solution;

[0023] (b) Into the 250mL three-necked bottle, add the prepared CdCl 2 and an aqueous solution of L-cysteine ​​(take 20mL of 0.02mol L -1 CdCl 2 Aqueous solution in a beaker, add 33mL double distilled water and 0.0096mol L-cysteine, with 5mol L -1 NaOH aqueous solution to adjust the pH at about 11.20), protected by argon, and stirred for 30min;

[0024] (c) Add an appropriate amount of the KHTe aqueous solution freshly prepared in a to b, keeping the molar ratio of Cd:Te:L-cysteine ​​at 2:1:4.8.

[0025] (d) The mixed solution in c was heated to 96° C. and refluxed for 20 minutes. Centrifuge and take the supernatant to obtain CdTe quantum dots with relatively uniform scale.

[0026] (e...

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Abstract

The water phase preparation process of water soluble nanometer CdTe / Cd(OH)2 crystal grain in core-shell structure is disclosed. The prepared water soluble nanometer CdTe / Cd(OH)2 crystal grain in core-shell structure has stable property, adjustable spectral range and high quantum yield. Hydrophilic mercaptan as stabilizer, cheap inorganic salt CdCl2 and Te powder are reacted in water solution to produce no-oxygen KHTe, which is heated and refluxed to produce water soluble nanometer CdTe particle. The water soluble nanometer CdTe particle and NaOH solution are reacted in hot bath for certain time determined by the thickness of Cd(OH)2 shell to produce quantum dot, which may have different sizes and different colors. The preparation process has relaxed condition, short production period, low cost, high quantum yield and other advantages, and the prepared modified particle may be used as probe in chemical, physical, biological, medical and other fields.

Description

【Technical field】: [0001] The invention relates to the technical field of preparation of quantum dots, in particular to the synthesis of high-quality water-soluble CdTe / Cd(OH) under simple and mild conditions 2 method of quantum dots. The quantum dot has the characteristics of adjustable spectrum, high quantum yield and stable properties. 【Background technique】: [0002] Quantum dots are mainly composed of group II-IV elements (such as CdSe, CdTe, CdS, ZnSe) and group III-V elements (such as InP, InAs), generally spherical or quasi-spherical particles with a particle size of 1-12nm. Due to the small particle size of quantum dots (about 1-30nm), electrons and holes are quantum-confined, and the continuous energy band becomes a discrete energy-level structure with molecular characteristics, so its optical behavior is different from that of some macromolecules (such as polycyclic Aromatic hydrocarbons) are very similar and can fluoresce. Due to the influence of spectral proh...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/54
Inventor 严秀平蔡朝霞陈英军
Owner NANKAI UNIV
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