Process for auxiliary synthesizing high lumineseent cadmium telluride quantum point by cysteine-containing polypeptide

A technology of cadmium telluride quantum dots and cystine polypeptides, applied in chemical instruments and methods, luminescent materials, measuring devices, etc., can solve the problems of narrow luminescence range and low quantum yield, and achieve wide luminescence range and reproducibility. Good sex, low toxicity effect

Inactive Publication Date: 2006-06-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Using biomolecules such as amino acids and peptides as stabilizers, quantum dots such as cadmium sulfide, zinc sulfide, and cadmium selenide have been successfully synthesized. The synthesized quantum dots have good biocompatibility, but the quantum yield of the synthesized quantum dots is Low, narrow luminous range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1). Preparation of sodium telluride hydride

[0018] Put 0.08 grams of solid sodium borohydride and 0.132 grams of tellurium powder into a small flask, and add 20 milliliters of water. After reacting at 0°C for 8 hours, sodium telluride hydride was generated and set aside.

[0019] (2).Glutathione-assisted synthesis of cadmium telluride quantum dots

[0020] Using water as a solvent, mix cadmium chloride with a concentration of 0.00125 mol / L and 0.0025 mmol / L glutathione, adjust the pH value of the solution to 9, and then inject 0.000625 mol / L sodium telluride hydride at a temperature of 25 degrees Celsius The mixture was stirred for 10 minutes to obtain a cadmium telluride precursor solution. The cadmium telluride precursor solution is heated at 80 degrees centigrade for 1-20 hours to obtain different quantum dots with an emission range of 480-650 nm.

Embodiment 2

[0022] (1). Preparation of potassium hydride telluride

[0023] Put 0.18 grams of solid potassium borohydride and 0.264 grams of tellurium powder into a small flask, and add 20 milliliters of water. After reacting at 0°C for 8 hours, potassium telluride hydride was generated for later use.

[0024] (2). Glystathione-assisted synthesis of cadmium telluride quantum dots

[0025] Using water as a solvent, mix cadmium acetate with a concentration of 0.02 mol / L and 0.05 mmol / L glycathione, adjust the pH value of the solution to 11, and then inject 0.01 mol / L sodium telluride hydride at a temperature of 25 degrees Celsius The mixture was stirred for 10 minutes to obtain a cadmium telluride precursor solution. The cadmium telluride precursor solution is heated at 120 degrees centigrade for 0.5-3 hours to obtain different quantum dots with an emission range of 520-650 nm.

Embodiment 3

[0027] (1). Preparation of sodium telluride hydride

[0028] Put 0.08 grams of solid sodium borohydride and 0.132 grams of tellurium powder into a small flask, and add 20 milliliters of water. After reacting at 0°C for 8 hours, sodium telluride hydride was generated and set aside.

[0029] (2). Glutathione-assisted synthesis of cadmium telluride quantum dots

[0030] Using water as a solvent, mix cadmium perchlorate with a concentration of 0.1 mol / L and 0.1 mol / L glutathione, adjust the pH value of the solution to 8, and then inject 0.025 mol / L sodium telluride hydride at a temperature of 25 degrees Celsius The mixture was stirred for 10 minutes to obtain a cadmium telluride precursor solution. The cadmium telluride precursor solution is heated at 140 degrees centigrade for 5 minutes to 1 hour to obtain different quantum dots with a light emission range of 480-650 nm.

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Abstract

The invention relates to cysteine polypeptide containing auxiliary composing high luminescence cadmium telluride quantum point method. It adopts cysteine polypeptide containing as stabilizer, and cadmium salt, or cadmic oxide, hydroxide, and tellurium sodium hydride, or tellurium potassium hydride, tellurium flour as material to form cadmium telluride fluorescence quantum point in aqueous solution. Its quantum yield is 40-65%; and its luminescence range is 480nm-650nm. The method has the advantages of low cost, simple operation, moderate condition, and good reproducibility. Its composed product has good water solubility, biocompatibility, little toxicity, high fluorescence quantum yield, wide luminescence range. And it has extensive application prospect in the fields such as immunizing analyzing, gene analyzing, clinical diagnosis, and so on.

Description

technical field [0001] The invention relates to a method for synthesizing high-luminescence cadmium telluride quantum dots assisted by a cysteine-containing polypeptide, using a cysteine-containing polypeptide (such as glutathione) as a stabilizer, cadmium salt (or its oxide, hydrogen Oxide) and sodium telluride hydride (or potassium telluride hydride, tellurium powder) are used as raw materials to prepare cadmium telluride fluorescent quantum dots with good biocompatibility and high luminescence performance, which belongs to the field of nanomaterial preparation technology and biological analysis and detection technology. Background technique [0002] Quantum dots, also known as semiconductor nanocrystals, are nanoparticles composed of group II-VI or group III-V elements, and cadmium telluride is one of them. Compared with organic fluorescent dyes, this material has unique photoluminescent properties, such as wide excitation wavelength range, narrow emission wavelength rang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/54G01N33/533
Inventor 任吉存钱惠锋仇欣
Owner SHANGHAI JIAO TONG UNIV
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