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Self-assembled CdTe quantum dot/SiO2/TGA composite three dimensional nano-material and preparation method thereof

A three-dimensional nanometer and quantum dot technology, which is applied in nanotechnology, nanotechnology, nano-optics, etc. for materials and surface science, can solve the problems of small quantum dots, achieve excellent properties, novel structure, high luminous efficiency and optical The effect of stability

Active Publication Date: 2015-08-19
济南德亨医学科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Due to the small size and large specific surface area of ​​quantum dots, they are very sensitive to the solution environment, and the change of surface properties will lead to many new phenomena. Although the research on quantum dots has been going on for decades, there are still many unknown areas. To be further explored, these imaginations are of great significance to the basic research and application of quantum dots

Method used

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  • Self-assembled CdTe quantum dot/SiO2/TGA composite three dimensional nano-material and preparation method thereof

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Embodiment 1

[0021] 1.1 Synthesis of CdTe quantum dots by the aqueous phase method: first synthesize the NaHTe required for the preparation of CdTe quantum dots, and mix Te powder with NaBH 4 Mix according to the molar ratio of 1:5, add a certain amount of water, heat and stir in a 60°C water bath under the protection of nitrogen until the solution turns lavender. 0.4 mmol of CdCl 2 2.5H 2 O was dissolved in 25 mL of water, 0.6 mmol of thioglycolic acid (TGA) was added, stirred, and then 1M NaOH solution was added until the pH value of the solution was adjusted to 11.2. The solution was deoxygenated with nitrogen for 30 minutes, then injected into the NaHTe solution prepared above, and heated to reflux at 100 °C for 0.5 h to obtain water-soluble green-emitting CdTe quantum dots (particle size: 2.6 nm). The quantum dots are precipitated from the solution by ethanol and isopropanol, centrifuged, and the obtained quantum dots are dispersed in water.

[0022] 1.2 Add 1.5 μL of tetraethyl o...

Embodiment 2

[0026] 2.1 Synthesis of CdTe quantum dots by water phase method: same as 1.1.

[0027] 2.2 Add 2 μL of methyl orthosilicate and 100 μL of 25% ammonia water to 2 mL of TGA-modified CdTe quantum dots. The diameter of the quantum dots is 8 nm, and the concentration of the quantum dots is 5×10 -5 M, stirred for 3h to obtain a uniform and transparent solution.

[0028] 2.3 Add 1mL of 1M PBS buffer solution with a pH of 7.4 to the solution in step 2.1, stir for 30 minutes, then transfer to a glass bottle and cover it, and store it at room temperature for 3 months. The solution is centrifuged to separate the self-assembled Nanocomposite material, washed with water, and then dispersed in water, wherein the dispersion concentration of quantum dots is 4×10 -5 M, obtain the CdTe quantum dots / SiO formed by the self-assembly of the present embodiment 2 / TGA composite three-dimensional nanomaterial, which is a straw bundle-like three-dimensional composite structure, with an average size o...

Embodiment 3

[0030] 3.1 Synthesis of CdTe quantum dots by water phase method: same as 1.1.

[0031] 3.2 Add 1 μL of propyl orthosilicate and 100 μL of 25% ammonia water to 2 mL of TGA-modified CdTe quantum dots. The diameter of the quantum dots is 4.5 nm, and the concentration of the quantum dots is 10 -4 M, stirred for 5h to obtain a uniform and transparent solution.

[0032] 3.3 Add 1 mL of PBS buffer solution with a pH of 7.4 1M to the solution in step 3.1, stir for 30 minutes, then transfer it to a glass bottle and cover it, and store it at room temperature for 12 months. The solution is centrifuged to separate the self-assembled Nanocomposite material, washed with water, and then dispersed in water, wherein the dispersion concentration of quantum dots is 1×10 -4 M, obtain the CdTe quantum dots / SiO formed by the self-assembly of the present embodiment 2 / TGA composite three-dimensional nanomaterial is a three-dimensional composite structure in the shape of a straw bundle, with an ave...

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Abstract

The invention relates to a self-assembled CdTe quantum dot / SiO2 / TGA composite three dimensional nano-material and a preparation method thereof. The composite three dimensional nano-material is composed of a CdTe quantum dot, SiO2 and TGA, the TGA is modified on the surface of the CdTe quantum dot as a ligand, the TGA modified CdTe quantum dot surface is coated with a SiO2 layer, and the TGA is positioned between the CdTe quantum dot and the SiO2 layer; and the nano-material has a straw bale-shaped shape, the length of the nano-material is 200-300[mu]m, and the diameter of the center of the nano-material is 50-120[mu]m. The preparation method of the nano-material comprises the following steps: coating the TGA modified CdTe quantum dot with the SiO2 layer through using a gel-gel technology, dispersing the TGA modified CdTe quantum dot coated with the SiO2 layer in a PBS buffer solution, and self-assembling to obtain the CdTe quantum dot / SiO2 / TGA composite three dimensional nano-material with high luminance. The nano-material has a wide application prospect in the fields of sensors, luminescence devices and solar batteries.

Description

technical field [0001] The invention belongs to the field of nano functional materials, and relates to a three-dimensional nanostructure formed by self-assembly of water-soluble CdTe quantum dots, especially a self-assembled CdTe quantum dot / SiO 2 / TGA composite three-dimensional nanomaterial and its preparation method. Background technique [0002] Due to the small size and large specific surface area of ​​quantum dots, they are very sensitive to the solution environment, and the change of surface properties will lead to many new phenomena. Although the research on quantum dots has been going on for decades, there are still many unknown areas. To be further explored, these imaginations are of great significance to the basic research and application of quantum dots. For water-soluble quantum dots, CdTe has attracted much attention due to its excellent properties, especially these water-soluble quantum dots have important applications in the fields of biological probes, lig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88B82Y20/00B82Y30/00
Inventor 杨萍陈玲苗艳平张爱玉
Owner 济南德亨医学科技有限公司
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