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Process for preparing water soluble CdTe/CdS nuclear/shell type quantum point

A quantum dot, water-soluble technology, applied in chemical instruments and methods, cadmium compounds, inorganic chemistry, etc., to achieve good monodispersity, low toxicity, fluorescence properties and improved quantum yield

Inactive Publication Date: 2005-11-09
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been many reports on the preparation of CdSe / CdS core / shell quantum dots from organic phases since 1997 (J.Am.Chem.Soc, 1997, 119:7019-7029, J.Am.Chem.Soc, 2003 , 125:12567-12575, J.Am.Chem.Soc, 2003, 125:3901-3909, Chem Mater, 2003, 15:3125-3133, Appl Phy Lett, 2004, 84:2223-2225), but water-soluble There are few reports on CdSe / CdS core / shell quantum dots, which largely limits the direct use of CdSe / CdS core / shell quantum dots for biomarkers

Method used

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  • Process for preparing water soluble CdTe/CdS nuclear/shell type quantum point
  • Process for preparing water soluble CdTe/CdS nuclear/shell type quantum point

Examples

Experimental program
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Effect test

Embodiment 1

[0018] 1. Take 0.31g Na 2 SO 3 and 4.10mg of Se powder, placed in a 5ml single-necked flask, added 4ml of pure water, heated to 90°C under nitrogen protection, and reacted for 20 hours to obtain Na 2 SeSO 3 solution.

[0019] 2. Mix 10ml 2.4×10 -3 mol / LMPA+1.0×10 -3 mol / LCdCl 2 Mix the solution, pass nitrogen to remove oxygen for 30 minutes, heat up to 100°C, inject 0.3ml Na 2 SeSO 3 solution. Stop heating and gradually cool down to room temperature to obtain a transparent solution of CdSeNCs. The solution glows orange under excitation at 365 nm.

[0020] 3. Prepare 100ml 4.8×10 -3 mol / LMPA+1.0×10 -3 mol / LCdCl 2 +0.8×10 -3 mol / LNa 2 S mixed solution, deoxygenated by nitrogen for 30 minutes, heated to 100°C, injected into the prepared 10ml CdSeNCs solution under vigorous stirring, kept reflux at 100°C for 24 hours, and obtained CdSe / CdS core / shell quantum dots.

Embodiment 2

[0022] 1. Take 1.5g Na 2 SO 3 and 21.5mg of Se powder, placed in a 25ml single-necked flask, added 15ml of pure water, heated to 100°C under nitrogen protection, and reacted for 35 hours to obtain Na 2 SeSO 3 solution.

[0023] 2. Mix 5ml 2.5×10 -2 mol / L MPA+1.0×10 -2 mol / L CdCl 2 Mix the solution, pass nitrogen to remove oxygen for 30 minutes, raise the temperature to 90°C, inject 1ml Na 2 SeSO 3 solution. Stop heating and gradually cool down to 15 °C to obtain a transparent solution of CdSeNCs.

[0024] 3. Prepare 100ml 1.0×10 -2 mol / L MPA+6.0×10 -3 mol / L CdCl 2 +2.5×10 -3 mol / L Na 2 The S mixed solution was passed through nitrogen to remove oxygen for 30 minutes, and the temperature was raised to 100°C, and 1.5ml of the prepared CdSeNCs solution was injected under vigorous stirring, and the reflux was maintained at 100°C for 50 hours to obtain CdSe / CdS core / shell quantum dots.

Embodiment 3

[0026] 1. Take 0.60g Na 2 SO 3 and 10.5mg of Se powder, placed in a 100ml single-necked flask, added 50ml of pure water, heated to 80°C under nitrogen protection, and reacted for 24 hours to obtain Na 2 SeSO 3 solution.

[0027] 2. Mix 15ml 2.8×10 -3 mol / L MPA+1.5×10 -3 mol / L CdCl 2 Mix the solution, pass nitrogen to remove oxygen for 30 minutes, heat up to 90°C, inject 5ml Na 2 SeSO 3 solution. Stop heating and gradually cool down to 30 °C to obtain a transparent solution of CdSeNCs.

[0028] 3. Prepare 100ml 6.0×10 -3 mol / L MPA+1.5×10 -3 mol / L CdCl 2 +1.0×10 -3 mol / L Na 2 S mixed solution, deoxygenated by nitrogen for 30 minutes, heated to 110°C, poured into the prepared 15ml CdSeNCs solution under vigorous stirring, kept reflux at 100°C for 48 hours, and obtained CdSe / CdS core / shell quantum dots.

[0029] According to the method of the present invention, water-soluble core / shell quantum dots with other types of stabilizers can be prepared.

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Abstract

A process for preparing the water-soluble shell quantum point of CdSe / CdS in water phase features that the cadmium chloride (or perchlorate) is used as its raw material.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and biological analysis and detection, and in particular relates to a preparation method of water-soluble CdSe / CdS core / shell quantum dots. technical background [0002] Quantum dots are a type of semiconductor nanocrystal grains composed of II-VI or III-V elements whose radius is smaller than or close to the exciton Bohr radius. When the diameter of the quantum dot is smaller than the Bohr diameter of its electron, the quantum dot has a quantum size effect on the electron, and its luminous wavelength is related to the size of the nanocrystal. Compared with organic fluorescent molecules, fluorescent quantum dot crystals have the following advantages: 1. The excitation spectrum is almost continuous above the absorption threshold, which is conducive to multi-wavelength excitation; 2. High-intensity fluorescence emission, narrow spectral peaks, and symmetrical peak shapes; 3. The emission wave...

Claims

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Application Information

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IPC IPC(8): C01G11/00
Inventor 黄维汪联辉范曲立何耀陆昊婷
Owner FUDAN UNIV
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