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Method for directly preparing silicon shell type CdTe quantal-point

A technology of quantum dots and silicon shells, which is applied in the field of preparation of nanomaterials, can solve the problems of limited development and application research, complex preparation methods, and reduced yields, and achieve improved photobleaching resistance, simple experimental equipment, and easy operation. Effect

Inactive Publication Date: 2008-05-28
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned method can be used to indirectly prepare quantum dot fluorescent nanoparticles coated with silicon shells, the preparation method is complicated and requires lengthy steps such as quantum dot preparation, centrifugation, MPS exchange, and silanization treatment, and multi-step processing results in production The rate is reduced, which limits its further development and application research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of silicon-shell CdTe quantum dots:

[0023] Weigh Cd(ClO 4 ) 2 ·6H 2 O 100mg was placed in a three-necked flask, 100mL of methanol was added, and then high-purity nitrogen gas was introduced to remove the oxygen in the solution. Add 0.715 mL of MPS to the solution, and pass through freshly prepared H under stirring 2 Te gas (by 13.9mg of Al 2 Te 3 With 0.5mol / L of H 2 SO 4 reaction), then stop the aeration, heat and reflux at 65°C for 10 minutes, adjust the pH value of the reaction solution to 8.0 with tetramethylammonium hydroxide and continue to reflux for 40 minutes, thereby directly preparing a quantum dot fluorescence surface coated with a silicon shell nanoparticles.

Embodiment 2

[0025] Preparation of silicon-shell CdTe quantum dots:

[0026] Weigh Cd(AC) 2 2H 2 O 63.5 mg was placed in a three-necked flask, 100 mL of tetrahydrofuran was added, and then high-purity nitrogen gas was introduced to remove oxygen in the solution. Add 1 mL of MPS to the solution and pass through freshly prepared H under stirring 2 Te gas (by 15mg Al 2 Te 3 With 0.5mol / L of H 2 SO 4 reaction), then stop the aeration, heat and reflux at 70°C for 10 minutes, adjust the pH value of the reaction solution to 8.5 with tetramethylammonium hydroxide and continue to reflux for 30 minutes, thereby directly preparing a quantum dot fluorescence surface coated with a silicon shell nanoparticles.

Embodiment 3

[0028] Preparation of silicon-shell CdTe quantum dots:

[0029] Weigh Cd(ClO 4 ) 2 ·6H 2 O 41.9mg was placed in a three-necked flask, 100mL of methanol was added, and then high-purity nitrogen gas was introduced to remove the oxygen in the solution. Add 0.625 mL of MPS to the solution, and pass through freshly prepared H under stirring 2 Te gas (by 4.25mg Al 2 Te 3 With 0.5mol / L of H 2 SO 4 reaction), then stop the aeration, heat and reflux at 65°C for 12 minutes, adjust the pH value of the reaction solution to 8.0 with tetramethylammonium hydroxide and continue to reflux for 40 minutes, thereby directly preparing the quantum dot fluorescence surface coated with a silicon shell nanoparticles.

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Abstract

This invention relates to a silicon shell style CdTe quanta point preparation method. The solution is methanol or tetrahydrofuran, cadmium salt and 3-thinness group propyl lumiflavin oxygen group silane are mixed to prepare hydrogen telluride gas under condition of nitrogen gas, then they are heated and back flow and oxy hydrogen four kalium amine is used to adjust solution pH value to alkalescence and go on back flow, so the CdTe quanta point wrapped by silicon shell is directly prepared. The advantage is easy operation, and there is no need of high temperature and other critical conditions, the procedure of MPS and other complex procedures is omitted, the particle disperse capability is good, anti-light bleaching capability is great improved. It has great application prospect in bio-molecular imaging and its tracing, and can be use as a new lighting material, it is widely used in laser, LED, photoreceptor and other research fields.

Description

technical field [0001] The invention relates to the preparation of nanometer materials, in particular to the preparation of silicon shell type CdTe quantum dots. Background technique [0002] Quantum Dots (QDs), also known as semiconductor nanocrystals (Semiconductor Nanocrystal), are nanoparticles composed of II-VI or III-V elements. Compared with traditional organic fluorescent dyes, quantum dots have excellent spectral properties, such as wide excitation wavelength range, narrow emission wavelength range, large Stokes shift, long fluorescence lifetime, and not easy to photobleaching. widespread attention. In particular, water-soluble quantum dots have shown extremely broad application prospects in the research fields of biochemistry, cell biology, and molecular biology. However, most of the preparation methods of quantum dots are based on organic phase synthesis, and the products obtained are fat-soluble, which seriously hinders the application of quantum dots in the fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/54
Inventor 王柯敏李朝辉刘剑波谭蔚泓
Owner HUNAN UNIV
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