Synthetic method of cadmium telluride/cadmium sulfide/zinc sulfide quantum dots

A technology for cadmium telluride quantum dots and a synthesis method, which is applied in the field of synthesis of cadmium telluride/cadmium sulfide/zinc sulfide quantum dots, can solve problems such as the degradation of fluorescence performance of quantum dots, and achieves avoiding degradation of optical performance, high fluorescence intensity, Effects of high fluorescence intensity and quantum yield

Inactive Publication Date: 2010-10-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the quantum dots prepared by the organic solvent method need to be surface modified before biological application to make them water-soluble and biocompatible, this will greatly degrade the fluorescence properties of quantum dots

Method used

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  • Synthetic method of cadmium telluride/cadmium sulfide/zinc sulfide quantum dots
  • Synthetic method of cadmium telluride/cadmium sulfide/zinc sulfide quantum dots
  • Synthetic method of cadmium telluride/cadmium sulfide/zinc sulfide quantum dots

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Experimental program
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Effect test

Embodiment 1

[0022] (a) Sodium borohydride and tellurium powder weighing 4.73125mg and 3.19mg are scattered in 20ml water respectively, react at room temperature for 3 hours to generate sodium telluride hydride solution;

[0023] (b) Mix 10ml of 0.1mol / L cadmium nitrate solution with 18ml of 0.1mol / L mercaptopropionic acid solution, add 1mol / L sodium hydroxide solution to adjust the pH to 12, and then introduce inert gas nitrogen , after stabilization, add the freshly prepared solution (a), and after aging the quantum dots for several days, use a polytetrafluoroethylene digestion tank to grow for 30 minutes at 180°C to obtain cadmium telluride quantum dots;

[0024] (c) Adding 40ml of thiourea solution with a concentration of 0.1mol / L to (b) cadmium telluride quantum dots, reacting for 5 hours under magnetic stirring, and aging for 12 days, to obtain cadmium telluride / cadmium sulfide quantum dots;

[0025] (d) Add 20ml of zinc nitrate solution with a concentration of 0.1mol / L to (c) cadmiu...

Embodiment 2

[0027] (a) Sodium borohydride and tellurium powder weighing 4.73125mg and 3.19mg are scattered in 20ml water respectively, react at room temperature for 3 hours to generate sodium telluride hydride solution;

[0028] (b) Mix 10ml of 0.1mol / L cadmium nitrate solution with 18ml of 0.1mol / L mercaptopropionic acid solution, add 1mol / L sodium hydroxide solution to adjust the pH to 12, and then introduce inert gas nitrogen , after stabilization, add the freshly prepared solution (a), and after aging the quantum dots for several days, use a polytetrafluoroethylene digestion tank to grow for 30 minutes at 180°C to obtain cadmium telluride quantum dots;

[0029] (c) Adding 40ml of thiourea solution with a concentration of 0.1mol / L to (b) cadmium telluride quantum dots, reacting for 5 hours under magnetic stirring, and aging for 12 days, to obtain cadmium telluride / cadmium sulfide quantum dots;

[0030] (d) Adding 20ml of zinc nitrate solution with a concentration of 0.1mol / L to (c) cad...

Embodiment 3

[0032] (a) Sodium borohydride and tellurium powder weighing 4.73125mg and 3.19mg are scattered in 20ml water respectively, react at room temperature for 3 hours to generate sodium telluride hydride solution;

[0033] (b) Mix 10ml of 0.1mol / L cadmium nitrate solution with 18ml of 0.1mol / L mercaptopropionic acid solution, add 1mol / L sodium hydroxide solution to adjust the pH to 12, and then introduce inert gas nitrogen , after stabilization, add the freshly prepared solution (a), and after aging the quantum dots for several days, use a polytetrafluoroethylene digestion tank to grow for 30 minutes at 180°C to obtain cadmium telluride quantum dots;

[0034] (c) Adding 40ml of thiourea solution with a concentration of 0.1mol / L to (b) cadmium telluride quantum dots, reacting for 5 hours under magnetic stirring, and aging for 12 days, to obtain cadmium telluride / cadmium sulfide quantum dots;

[0035] (d) Add 20ml of zinc nitrate solution with a concentration of 0.1mol / L to (c) cadmiu...

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Abstract

The invention relates to a synthetic method of admium telluride/cadmium sulfide/zinc sulfide quantum dots. An inner core is an admium telluride quantum dot and is coated by cadmium sulfide and zinc sulfide in sequence. The synthetic method for the quantum dots comprises the following steps of: firstly, preparing an admium telluride quantum dot with excellent fluorescent characteristic by hydrolyzing a sulfhydryl group; secondly, adding thiourea with a certain concentration into the reacted admium telluride solution, forming free suplfur ions released by slowly hydrolyzing and photolyzing thiourea and cadmium ion dangling bonds existing on the surface of the admium telluride quantum dot into bonds; generating a thin cadmium sulfide casing layer on the surface of the cadmium sulfide quantum dot; and finally adding a zinc acetate solution and a sodium sulfide solution into the admium telluride/cadmium sulfide quantum dots with nuclear shell structures and carrying out hydro-thermal growth in a polytetrafluoroethylene digestion tank to form the admium telluride/cadmium sulfide/zinc sulfide quantum dots. The quantum dots have the characteristics of high fluorescent strength, favorable stability, high quantum yield and low biotoxicity and are hopeful to be applied to the field of biomarkers instead of the traditional organic dye. The synthetic method has the advantages of simple process, convenience, low cost and strong operability.

Description

technical field [0001] The invention relates to a synthesis method of cadmium telluride / cadmium sulfide / zinc sulfide quantum dots, and belongs to the technical field of composite nanometer materials and biomarkers. Background technique [0002] Quantum dots have excellent optical properties such as wide excitation spectrum, narrow fluorescence half-maximum width, high photochemical stability, and multicolor luminescence that can be excited by a single excitation source. As biomarkers, their performance can surpass traditional organic dyes in many aspects. As a biomarker, quantum dots will bring great breakthroughs to biology and medicine. With the expansion of its application fields and the development of preparation technology, it will also greatly accelerate the reduction of production costs of quantum dots, and it is expected to completely replace traditional organic biomarkers in the end. dye. [0003] It is well known that biological applications require quantum dots t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88
Inventor 李冬梅姚亚玲许臻于征汕傅腾飞
Owner SHANGHAI UNIV
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