Method for transferring oil phase quantum dots to aqueous phase

A technology of oil-phase quantum dots and quantum dots, which is applied in the field of quantum dots, can solve the problems of poor repeatability, complicated process, and long cycle, and achieve the effect of universal and simple methods

Inactive Publication Date: 2012-06-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stability and water solubility of quantum dots modified by this method are good, but there are many steps, cumbersome operation, long cycle and poor repeatability
(3) The quantum dots are directly embedded in the cavity of the polymer. This method is also cumbersome to operate, difficult to control, and has poor repeatability.
This method needs to use a large amount of organic solvent, the process is complicated, and the purification is difficult
In addition, due to the different quantum dot systems, the synthesis methods are often different, resulting in the above-mentioned different surface modification methods are often only applicable to some specific systems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Disperse 5 mmol of oleylamine-coated CdS quantum dots in 100 ml of n-hexane. Then 10 g of polyacrylic acid was added and stirred at room temperature for 48 hours. Then 50 ml of ethanol was added, and stirring was continued at room temperature for 24 hours. Then 100 ml of deionized water was added, and n-hexane and ethanol were evaporated. Finally, CdS quantum dots uniformly dispersed in water were obtained.

Embodiment 2

[0017] 4 mmol of trioctylphosphine oxide (TOPO)-coated CdSe quantum dots were dispersed in 100 ml of toluene. Then 10 g of polyethylene was added and stirred at room temperature for 40 hours. Add 40ml of ethanol again, and continue stirring at room temperature for 20 hours. Then another 100 ml of deionized water was added, and the toluene and ethanol were evaporated. Finally, CdSe quantum dots uniformly dispersed in water are obtained.

Embodiment 3

[0019] 5 mmol of trioctylphosphine (TOP)-coated CdTe quantum dots were dispersed in 80 ml of n-hexane. Then 10 g of polyethylene oxide was added and stirred at room temperature for 42 hours. Then 50 ml of ethanol was added, and stirring was continued at room temperature for 22 hours. Then 100 ml of deionized water was added, and n-hexane and ethanol were evaporated. Finally, CdTe quantum dots uniformly dispersed in water are obtained.

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PUM

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Abstract

The invention relates to a method for transferring oil phase quantum dots to an aqueous phase, and belongs to the technical field of quantum dots. The method comprises the following steps of: dispersing the quantum dots in an organic solvent, adding a macromolecular C, stirring, adding ethanol, stirring, and adding deionized water; and evaporating the organic solvent and the ethanol, and thus obtaining quantum dots A uniformly dispersed in water. The quantum dots A are Au, Ag, In2O3, Fe2O3, CdS, CdSe, CdTe or CdSe/ZnS; the organic solvent is n-hexane, toluene, cyclohexane, n-octane, dichloromethane, trichloromethane, pyridine or dichlorotoluene; and the macromolecular C is polyethylene, polyvinyl chloride, polyvinyl pyrrolidone, polypropylene, polyacrylic acid, polyvinyl alcohol, polyethylene glycol, polyethylene methyl ester, polyacrylamide, polyoxyethylene or polyurethane. The method is simple and general, and the oil phase quantum dots can be transferred to the aqueous phase.

Description

technical field [0001] The invention relates to a general method for transferring oil-phase quantum dots to water phases, which can be specifically applied to the transfer of various oil-phase quantum dots such as oxides, sulfides and selenides, and belongs to the technical field of quantum dots. Background technique [0002] Due to the quantum confinement effect of semiconductor quantum dot materials, electrons and holes are quantum confinement. When the size of the quantum dot is smaller than the Bohr radius, the energy level distribution of the quantum dot will change from a continuous energy level to a discrete energy level. After being excited, it can emit light of specific wavelengths. The luminescent properties of quantum dots can be adjusted by changing the particle size and chemical composition. It is precisely because of the excellent luminescent properties of quantum dots that they have broad application prospects in biochemistry, molecular biology and other fiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/56C09K11/88C09K11/60C09K11/58C09K11/02
Inventor 陈卓曹传宝
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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