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Method for preparing quantum dots from hyperbranched polymer

A technology of hyperbranched polymers and quantum dots, which is applied in chemical instruments and methods, binary selenium/tellurium compounds, nanotechnology, etc. Quantum dots mass production and other issues, to achieve simple and reliable steps, good industrialization prospects, and achieve the effect of fluorescence spectrum tunability

Inactive Publication Date: 2019-05-21
南通创亿达新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

JunLian Huang et al. (Journal of Applied Polymer Science 2006, 102, 3679-3684) reported the preparation of CdSe quantum dots using star-like hyperbranched polymers with sulfur atoms on the arms, but the star-like hyperbranched polymers used therein The synthesis steps are complicated, which is not conducive to the mass production of quantum dots
CN101665691 A utilizes easy-to-prepare hyperbranched polyamidoamines to prepare CdS quantum dots. The method has simple steps, but the obtained CdS quantum dots have a single fluorescence emission wavelength, which cannot meet the requirements for multicolor light emission in practical applications

Method used

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  • Method for preparing quantum dots from hyperbranched polymer
  • Method for preparing quantum dots from hyperbranched polymer
  • Method for preparing quantum dots from hyperbranched polymer

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Experimental program
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Embodiment 1

[0038] First, under an inert gas atmosphere, 40 mg of selenium powder and 115 mg of sodium borohydride were added to 30 mL of ultrapure water, and vigorously stirred at room temperature for 30 min until the selenium powder was completely dissolved to obtain a colorless and transparent A solution. Subsequently, 200 mg of hyperbranched polyethyleneimine was dissolved in 20 mL of ultrapure water to obtain a 10 mg / mL aqueous solution of hyperbranched polyethyleneimine, to which 175 mg of CdCl was added 2 .2.5H 2 O (cadmium chloride hydrate), stirred at room temperature for 8 hours to obtain B solution. Finally, in the glove box, under vigorous stirring, the solution A was slowly added dropwise to the solution B, and then placed in an oil bath at 100° C. for 1 hour to react to prepare cadmium selenide quantum dots.

[0039] The fluorescence emission wavelength of the quantum dots obtained in this example is 487 nm.

Embodiment 2

[0041] Under an inert gas atmosphere, 40 mg of selenium powder and 115 mg of sodium borohydride were added to 30 mL of ultrapure water, and stirred vigorously at room temperature for 30 min until the selenium powder was completely dissolved to obtain a colorless and transparent A solution. Subsequently, 200 mg of hyperbranched polyethyleneimine was dissolved in 20 mL of ultrapure water to obtain a 10 mg / mL aqueous solution of hyperbranched polyethyleneimine, to which 263 mg of CdCl was added 2 .2.5H 2 O (cadmium chloride hydrate), stirred at room temperature for 8 hours to obtain B solution. Finally, in the glove box, under vigorous stirring, the solution A was slowly added dropwise to the solution B, and then placed in an oil bath at 100° C. for 1 hour to react to prepare cadmium selenide quantum dots.

[0042] The fluorescence emission wavelength of the quantum dots obtained in this example is 503 nm.

Embodiment 3

[0044] Under an inert gas atmosphere, 40 mg of selenium powder and 115 mg of sodium borohydride were added to 30 mL of ultrapure water, and stirred vigorously at room temperature for 30 min until the selenium powder was completely dissolved to obtain a colorless and transparent A solution. Subsequently, 200 mg of hyperbranched polyethyleneimine was dissolved in 20 mL of ultrapure water to obtain a 10 mg / mL aqueous solution of hyperbranched polyethyleneimine, to which 528 mg of CdCl was added 2 .2.5H 2 O (cadmium chloride hydrate), stirred at room temperature for 8 hours to obtain B solution. Finally, in the glove box, under vigorous stirring, the solution A was slowly added dropwise to the solution B, and then placed in an oil bath at 100° C. for 1 hour to react to prepare cadmium selenide quantum dots.

[0045] The fluorescence emission wavelength of the quantum dots obtained in this example is 515 nm.

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Abstract

The invention discloses a method for preparing quantum dots from a hyperbranched polymer. The method comprises the following steps: adding specified proportions of selenium powder and sodium borohydride to deionized water in an inert atmosphere, and performing stirring at room temperature for half an hour to obtain a solution A; dissolving the hyperbranched polymer in deionized water, dissolving acadmium salt in the obtained solution, and performing stirring at room temperature for a first specified period of time to obtain a solution B; mixing the solution A with the solution B according toa specified feed ratio, and performing stirring for a second specified period of time to obtain a solution C; and adding a zinc salt solution and a sodium sulfide solution to the solution C, and performing stirring for a third period of time to obtain the quantum dots. A feed ratio of a cadmium precursor to a selenium precursor is adjusted to obtain a series of cadmium selenide quantum dots with different fluorescence emission peaks, so the fluorescence spectrum adjustability of quantum dots is realized.

Description

technical field [0001] The invention relates to the technical field of photoelectric display materials, in particular to a method for preparing quantum dots by utilizing hyperbranched polymers. Background technique [0002] Hyperbranched polymers are a type of highly branched macromolecules with a three-dimensional quasi-spherical structure. The preparation steps are simple, with good solubility and abundant terminal functional groups. Therefore, they are used as support materials in coatings and plastic additives, chromatographic separation and Drug delivery vehicles and other fields have a wide range of applications. [0003] Due to the branched structure and defects in the hyperbranched polymer, it has abundant nanoscale cavities, which are very suitable for preparing quantum dots as nanoreactors. Secondly, through the structural design of the hyperbranched polymer, electron-rich functional groups such as nitrogen, oxygen, and sulfur can be introduced into it. On the one...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/02B82Y20/00B82Y40/00C01B19/04
Inventor 朱新远孙佩黄海涛童刚生刘晓东
Owner 南通创亿达新材料股份有限公司
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