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Surface modified cadmium telluride-containing silica dioxide nano particle and its preparation method

A silicon dioxide and surface modification technology, applied in the field of nanomaterials, can solve the problems of decreased fluorescence intensity, low fluorescence intensity, and low quantum yield, and achieve good stability, good repeatability, and stable process conditions.

Inactive Publication Date: 2007-07-11
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Stber method is based on ligand exchange, but the fluorescence intensity of the resulting silica / cadmium telluride nanoparticles is reduced by 20 times (Chem.Mater., 2000, 12, 2676-2685); inverse microemulsion The fluorescence intensity of the silica / cadmium telluride nanoparticles obtained by the method also has a significant decline, and the quantum yield is not high, only 7% (Adv.Mater., 2005, 17, 2354)

Method used

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  • Surface modified cadmium telluride-containing silica dioxide nano particle and its preparation method
  • Surface modified cadmium telluride-containing silica dioxide nano particle and its preparation method
  • Surface modified cadmium telluride-containing silica dioxide nano particle and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Take 2~5mL concentration as 2×10 -3 ~10 -5 mol / L cadmium telluride quantum dots, add 1~2mL methanol while stirring, add 1~3μL mercaptopropyltrimethoxysilane after 5~30 minutes, and continue stirring at room temperature for 15~40 minutes to obtain silica / Cadmium telluride nanoparticles, diluted for use.

[0033] (2) Take 1-10 mg of calix[4]arene, add 100-250 μL of dichloromethane to dissolve, add 50 μL of γ-[(2,3)-glycidyloxy]propyltrimethoxysilane, add 50 μL trifluoroacetic acid, sonicate for 1-3 minutes, then add 100-150μL of tetraethoxysilane, sonicate for 3-10 minutes, and then centrifuge at 8000-12000r / min for 5-10 minutes to obtain a cup[4] Aromatic hydrocarbon sol, take out the supernatant and set aside.

[0034] (3) Take 2 to 5 mL of silica / cadmium telluride nanoparticle solution, add 2 to 25 μL of calix[4]arene sol while stirring, and keep stirring for 20 to 30 minutes to make the calix[4]arene sol pass through chemical covalent The coupling is bonded ...

Embodiment 2

[0036] (1) Take 5ml concentration of 10 -3 mol / L quantum dots, add 2mL methanol while stirring, add 1μL mercaptopropyltrimethoxysilane after 20 minutes, continue stirring for 20 minutes to prepare silica / cadmium telluride nanoparticles, and then dilute to 25mL.

[0037] (2) Take 2 mg of calix[4]arene, add 200 μl of dichloromethane to dissolve, add 50 μl of γ-[(2,3)-glycidoxy]propyltrimethoxysilane, add 38 μl of trifluoroacetic acid, Sonicate for 1 minute, then add 100 μl of tetraethoxysilane, sonicate for 3 minutes, and then centrifuge at 10,000 r / min for 8 minutes to prepare a calix[4]arene sol for use.

[0038](3) Take 2.5 ml of the silica / cadmium telluride nanoparticle solution in step (1), add 15 μl of cup[4]arene sol while stirring, and keep stirring for 30 minutes to make the calix[4]arene sol pass through chemical covalent The coupling is bonded on the surface of the silicon dioxide layer, and the dichloromethane therein is completely volatilized. As shown in Figure 1...

Embodiment 3

[0040] (1) Take 2~5mL concentration as 2×10 -3 ~10 -5 mol / L quantum dots, add 1~2mL methanol while stirring, add 1~3μL mercaptopropyltrimethoxysilane after 5~30 minutes, continue stirring at room temperature for 15~40 minutes, dilute and set aside.

[0041] (2) Take 1-10 mg of calix[6]arene, add 100-250 μL of dichloromethane to dissolve, add 50 μL of γ-[(2,3)-glycidyloxy]propyltrimethoxysilane, add 50 μL trifluoroacetic acid, sonicated for 1 to 3 minutes, then added 100 to 150 μL of tetraethoxysilane, sonicated for 3 to 10 minutes, and then centrifuged at 8000 to 12000 r / min for 5 to 10 minutes to obtain a cup[6] Aromatic hydrocarbon sol, ready for use.

[0042] (3) Take 2-5 mL of silica / cadmium telluride nanoparticles, add 2-20 μL of calix[6]arene sol while stirring, and keep stirring for 30 minutes to make the calix[6]arene sol pass through chemical covalent coupling bonds Combined on the surface of the silicon dioxide layer, and let the dichloromethane in it completely v...

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Abstract

The invention discloses a surface decorative silica nanometer particle with cadmium telluride, which comprises the following steps: adopting quantum point of cadmium telluride as base; utilizing ligand exchange and siloxane hydrolyzing method to obtain the silica / cadmium telluride nanometer particle as core-case structure through one-step reaction; bonding aromatic cup hydrocarbons on the surface of particle through gel-sol method with stable nanometer, optical and high fluorescent strength.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to surface-modified silicon dioxide nanoparticles containing cadmium telluride and a preparation method thereof. Background technique [0002] Quantum dots are II-VI semiconductor nanocrystals, with high fluorescence intensity, narrow and symmetrical fluorescence emission peaks, controllable composition and size of fluorescence color, continuous band excitation spectrum, and easy realization of unit excitation and multiple emission. Optical properties, with great application potential in the biomedical field. In order to improve the stability of quantum dots, it is required to wrap a layer of inert material on its surface, and silicon dioxide is an ideal choice. There are two main methods for preparing silica nanoparticles (silicon dioxide / quantum dots) that contain quantum dots: Stber method (Chem.Mater., 2000, 12, 2676-2685) and reverse microemulsion method (J. Am. Chem. Soc....

Claims

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Application Information

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IPC IPC(8): C09K11/88C09K11/02
Inventor 李海兵屈风阁王晓琼
Owner HUAZHONG NORMAL UNIV
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