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Method for preparing silicon dioxide hybridized quantum dot by using one-pot method

A technology of silicon dioxide and quantum dots, which is applied in the field of nanotechnology preparation, can solve the problems of difficult wide application of quantum dots, unstable luminescence, and difficult preparation, and achieve good application prospects, excellent luminescent performance, and low toxicity.

Active Publication Date: 2010-06-16
ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesized quantum dots still have some serious disadvantages, such as unstable luminescence, difficulty in mass production, high toxicity, etc., which make it difficult for quantum dots to be widely used.

Method used

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  • Method for preparing silicon dioxide hybridized quantum dot by using one-pot method
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  • Method for preparing silicon dioxide hybridized quantum dot by using one-pot method

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Using cadmium acetate as the metal source for the preparation of quantum dots, mercaptopropionic acid stabilizer, sodium selenium hydride as the non-metallic source for the preparation of quantum dots, and ethyl orthosilicate as the source of silicon dioxide, the preparation of silicon dioxide hybrid CdSe quantum dots .

[0017] Step (a): In a 2-liter reaction flask, add 1.33 grams of cadmium acetate and 2.55 grams of mercaptopropionic acid into 1.5 liters of deionized water, and adjust the pH of the solution to 8.0 with sodium hydroxide to prepare a cadmium ion precursor solution.

[0018] Step (b): The temperature of the solution is raised to 100° C. while passing nitrogen into the reaction bottle, and then 4 ml of an aqueous solution containing 0.41 g of sodium selenium hydride is added to prepare a precursor liquid of CdSe quantum dots.

[0019] Step (c): Inject 20.8 g of ethyl orthosilicate into the precursor liquid of CdSe quantum dots, and react at 100° C. for 48...

Embodiment 2

[0021] Using cadmium acetate as the metal source for the preparation of quantum dots, mercaptopropionic acid stabilizer, potassium selenium hydride as the non-metallic source for the preparation of quantum dots, and ethyl orthosilicate as the source of silicon dioxide, the preparation of silicon dioxide hybrid CdSe quantum dots .

[0022] Step (a): In a 2-liter reaction flask, add 0.27 g of cadmium acetate and 0.65 g of mercaptopropionic acid into 1.5 liters of deionized water, and adjust the pH value of the solution to 10.0 with sodium hydroxide to prepare a cadmium ion precursor solution.

[0023] Step (b): The temperature of the solution was raised to 90° C. while passing nitrogen into the reaction flask, and then 4 ml of an aqueous solution containing 0.1 g of potassium selenide was added to prepare a precursor liquid of CdSe quantum dots.

[0024] Step (c): Inject 20.8 g of ethyl orthosilicate into the precursor liquid of CdSe quantum dots, and react at 90° C. for 72 hour...

Embodiment 3

[0026] Using cadmium acetate as the metal source for preparing quantum dots, thioglycolic acid stabilizer, sodium selenium hydride as the non-metallic source for preparing quantum dots, and ethyl orthosilicate as the silicon dioxide source, the silicon dioxide hybrid CdSe quantum dots were prepared.

[0027] Step (a): In a 2-liter reaction flask, add 4.1 grams of cadmium acetate and 4.4 grams of mercaptoacetic acid into 1.5 liters of deionized water, and adjust the pH value of the solution to 7.5 with sodium hydroxide to prepare a cadmium ion precursor solution.

[0028] Step (b): The temperature of the solution is raised to 100° C. while passing nitrogen into the reaction flask, and then 4 ml of an aqueous solution containing 0.96 g of sodium selenium hydride is added to prepare a precursor liquid of CdSe quantum dots.

[0029] Step (c): Inject 150 grams of tetraethyl orthosilicate into the precursor liquid of CdSe quantum dots, and react at 100° C. for 24 hours to prepare sil...

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Abstract

The invention discloses a method for preparing silicon dioxide hybridized quantum dot by using a one-pot method. The invention comprises the following steps of: adding a non-metal ion source needed for preparing quantum dots to a quantum dot metal ion source containing mercapto stabilizer in a water phase system, getting the precursor liquid of quantum dot under the protection of a nitrogen atmosphere, then adding the silicon dioxide to the precursor liquid of quantum dot and reacting the silicon dioxide with the precursor liquid of quantum dot to obtain the silicon dioxide hybridized quantumdot. The silicon dioxide hybridized quantum dot obtained in the invention has the advantages of good dissolubility, excellent luminous performance and optical stability, good biocompatibility and biological stability, and good prospect of application in the aspects of biomarker and function materials.

Description

technical field [0001] The invention relates to a preparation method in the field of nanotechnology, in particular to a one-pot method for preparing silicon dioxide hybrid quantum dots, Background technique [0002] The fluorescence wavelength or luminous color of quantum dots can be easily adjusted by the particle size. The quantum efficiency of luminescence is high, and it has a narrow and symmetrical emission spectrum and a wide and continuous absorption spectrum. These characteristics make quantum dots widely used in biomarkers, light-emitting devices, Composite materials, solar cells and other fields show broad application prospects. However, the synthesized quantum dots still have some serious disadvantages, such as unstable luminescence, difficulty in mass production, high toxicity, etc., which make it difficult for quantum dots to be widely used. In order to solve these shortcomings, a layer of silicon dioxide can be coated on the surface of quantum dots. Silica ha...

Claims

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Application Information

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IPC IPC(8): B82B3/00
Inventor 高超周立
Owner ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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