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Silicon dioxide fluorescent microball containing cadmium telluride fluorescence quantum point and its preparation method

A technology of cadmium telluride quantum dots and fluorescent quantum dots, applied in chemical instruments and methods, luminescent materials, etc., to achieve the effects of clear structure, easy biocoupling, and high biocompatibility

Active Publication Date: 2007-03-21
苏州欣影生物医药技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there has been no report on the controlled preparation of silica microspheres containing single or multiple cadmium telluride quantum dots by inverse microemulsion method.

Method used

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  • Silicon dioxide fluorescent microball containing cadmium telluride fluorescence quantum point and its preparation method
  • Silicon dioxide fluorescent microball containing cadmium telluride fluorescence quantum point and its preparation method
  • Silicon dioxide fluorescent microball containing cadmium telluride fluorescence quantum point and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 1.405g cadmium perchlorate (Cd(ClO 4 ) 2 ·6H 2 O) Add to 150mL deaerated secondary deionized water, then add 0.56mL mercaptoglycerol and 0.12mL thioglycolic acid stabilizer, then adjust its pH value to 11.2 with NaOH aqueous solution to form a solution containing mercapto compounds and cadmium ions. On the other hand, take 30mL of 0.5M sulfuric acid solution and inject it into a container containing 0.39g of aluminum telluride (Al 2 Te 3 ) in the flask, the generated H 2 Put all Te into the above-mentioned cadmium ion solution, stir for 15 minutes, heat and reflux for 10 minutes to 10 days, and obtain a cadmium telluride fluorescent quantum that is co-stabilized with mercaptoglycerol and thioglycolic acid and whose fluorescence emission center peak is between 510 and 650 nanometers. Dot the water solution. The fluorescence spectrum is shown in Figure 1.

Embodiment 2

[0036] Weigh 1.315g cadmium perchlorate (Cd(ClO 4 ) 2 ·6H 2 O) Add to 150mL deoxygenated secondary deionized water, then add 0.55mL mercaptoacetic acid as a stabilizer, adjust its pH to 11.2 to form a solution containing mercapto compounds and cadmium ions. The rest of the steps are the same as in Example 1 to obtain an aqueous solution of cadmium telluride quantum dots that is stable with thioglycolic acid and whose fluorescence emission center peak is between 510 and 650 nanometers.

Embodiment 3

[0038] Weigh 1.031g cadmium chloride (CdCl 2 2.5H 2 O) Add to 150mL deoxygenated secondary deionized water, then add 0.55mL mercaptopropionic acid as a stabilizer, adjust its pH to 11.2 to form a solution containing mercapto compounds and cadmium ions. The rest of the steps are the same as in Example 1 to obtain an aqueous solution of cadmium telluride quantum dots that is stable with mercaptopropionic acid and whose fluorescence emission center peak is between 510 and 650 nanometers.

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Abstract

The present invention relates to fluorescent silica microball containing cadmium telluride fluorescence quantum point(s). By using the mixture of water soluble cadmium telluride fluorescence quantum point and ammonia water as oil phase and non-ionic surfactant as emulsifier to form reverse phase micro emulsion and through one-step reaction of hydrolyzing siloxane at room temperature, fluorescent silica microball in core-shell structure is first obtained; and through further deposition and separation, silica microball with cadmium telluride fluorescence quantum point is obtained. Controlling the experiment condition can obtain fluorescent silica microball of particle size adjustable in 30-100 nm, and altering the type of siloxane or adding cationic polyelectrolyte can obtain fluorescent silica microball with several cadmium telluride quantum points, the number of which is controlled by means of changing the amount of the cationic polyelectrolyte.

Description

technical field [0001] The invention relates to silicon dioxide fluorescent microspheres containing cadmium telluride fluorescent quantum dots and a preparation method thereof. More specifically, the water-soluble cadmium telluride fluorescent quantum dots are compounded into silica microspheres by using the reverse microemulsion method to prepare silica fluorescent microspheres with single or multiple cadmium telluride quantum dots. At the same time, the number of cadmium telluride quantum dots in the silica fluorescent microspheres is controlled. Background technique [0002] The unique fluorescent size tunability of II-VI fluorescent nanoparticles (also known as fluorescent quantum dots) makes them have great application prospects as a labeling material in biological analysis and biological research. As a labeling material, fluorescent quantum dots require a layer of inert material coated on its surface to improve its chemical stability. Silica is undoubtedly an ideal c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/54C09K11/00
Inventor 高明远杨云华
Owner 苏州欣影生物医药技术有限公司
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