Preparation method of monodisperse quantum dot micro spheres with optical gain property

A technology of optical gain and quantum dots, applied in chemical instruments and methods, luminescent materials, etc., to achieve the effects of improving sphericity and stability, improving stability, and not being easily oxidized

Active Publication Date: 2016-05-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the problems of the current preparation method of quantum dot microspheres, this application uses Pickering emulsion to prepare stable, monodisperse large particle size micr

Method used

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  • Preparation method of monodisperse quantum dot micro spheres with optical gain property
  • Preparation method of monodisperse quantum dot micro spheres with optical gain property
  • Preparation method of monodisperse quantum dot micro spheres with optical gain property

Examples

Experimental program
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Effect test

Embodiment 1

[0044] (1) SiO containing 0.2wt% average particle size of 20nm and 10% standard deviation of particle size distribution 2 20 mL of the aqueous phase of nanospheres and 0.05 wt % cetyltrimethylammonium bromide was placed in a beaker and fully dispersed under magnetic stirring. Disperse 10 mg of CdS / ZnS quantum dots with a fluorescence emission peak width of 20 nm, 200 μL of vinyltrimethoxysilane, and 0.5 g of methyl methacrylate into 5 mL of anhydrous toluene, and transfer them to the pressure tank of the membrane emulsifier after the dispersion is uniform .

[0045] (2) Select a membrane with an average pore diameter of 1.4 μm, and adjust the pressure to 48 kPa for emulsification.

[0046] (3) Add 0.005g of photoinitiator 2-hydroxyl-2-methyl-1-phenylacetone to the emulsion, place the stable emulsion under the ultraviolet light curing instrument, and under the action of stirring, trigger methyl Methyl acrylate was polymerized for 2h to obtain PMMA.

[0047] (4) The solidifie...

Embodiment 2

[0050] (1) TiO with 2wt% average particle diameter of 100nm and 10% standard deviation of particle size distribution 2 10 mL of the aqueous phase of nanospheres and 0.1 wt % sodium dodecylsulfonate was placed in a beaker and fully dispersed under magnetic stirring. Disperse 10 mg of CdSe / ZnS quantum dots with a fluorescence emission peak width of 24 nm, 5 mg of CdS / ZnS quantum dots, 500 μL of hexadecyltrichlorosilane, 1 g of styrene, and 0.01 g of initiator azobisisobutyronitrile into 5 mL of anhydrous In octane, after being uniformly dispersed, it is transferred to the pressure tank of the membrane emulsifier.

[0051] (2) Select a membrane with an average pore diameter of 2.5 μm, and adjust the pressure to 24 kPa for emulsification.

[0052] (3) Slowly raise the temperature of the stable emulsion to 80° C. under the action of stirring, and stabilize it for 8 hours to polymerize to obtain PS.

[0053] (4) The solidified microspheres were centrifuged, washed 3 times with wat...

Embodiment 3

[0056] (1) the aqueous phase 10mL that will contain 10wt% average particle diameter is 200nm, the PVP nanosphere of particle size distribution standard deviation 10%, 1wt% Tween-80, 0.5wt% sodium dodecylsulfonate is placed in the beaker, Thoroughly disperse under magnetic stirring. 20 mg of CuInS with a fluorescence emission peak width of 110 nm 2 / ZnS quantum dots, 1mL octyltriethoxysilane, 1.5g of 2,4'-toluene diisocyanate, 0.005 initiator azobisisobutyronitrile are dispersed in 10mL of anhydrous DMF, and transferred to the membrane after the dispersion is uniform In the pressure tank of the emulsifier.

[0057] (2) Select a membrane with an average pore diameter of 6.6 μm, and adjust the pressure to 5 kPa for emulsification.

[0058] (3) The stable emulsion was cured for 1 hour under a UV curing apparatus to obtain PU, and the temperature was slowly raised to 70° C. under the action of stirring, and stabilized for 4 hours.

[0059] (4) The solidified microspheres were ce...

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Abstract

The invention relates to a preparation method of monodisperse quantum dot micro spheres with the optical gain property. Through the processes of dispersion, emulsification, polymerization curing and surface coating and the like, the stable monodisperse large-particle-diameter micro sphere carriers are prepared from pickering emulsion; the carriers are compounded into micro spheres by using a dense accumulation mode of quantum dots in the micro sphere; quantum dot micro spheres with the optical gain characteristics are prepared. The quantum dot micro sphere with the optical gain property is prepared. The obtained quantum dot micro sphere product has the advantages that the sphericity degree is high; the particle diameter distribution is uniform (the standard difference is smaller than 15 percent), the particle diameter is controllable in a range being 5 to 50 mum; the corresponding defects of the existing method for preparing the large-particle diaemter micro sphere carriers are overcome; relevant problems of quantum dot micro sphere preparation are solved. The stable quantum dot micro sphere with the optical gain property has the potential application in the fields of biological tags, molecular detection and lasers.

Description

technical field [0001] The invention belongs to the field of nano-micro composite materials, and relates to a method for preparing monodisperse quantum dot microspheres with optical gain properties. Background technique [0002] Due to their unique physical and chemical properties, nanomaterials have become a research hotspot in the past ten years. Quantum dots are semiconductor nanomaterials with three-dimensional dimensions at the nanometer scale. They have excellent optical properties, and their fluorescence emission spectrum has higher brightness, narrower width, more symmetry, and adjustable frequency. And tunable light-emitting diodes (LEDs), solar cells, quantum dot micro-lasers and other optoelectronic applications have great prospects. [0003] However, due to the small size and sensitive properties of quantum dots, it is difficult to directly apply them alone. Combining quantum dots in micron-scale carriers to form nano-micron composite materials is a major way fo...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/56C09K11/62C09K11/88
CPCC09K11/025C09K11/565C09K11/623C09K11/883
Inventor 谢闯杨丽静侯宝红郝红勋龚俊波陈巍王永莉尹秋响王静康
Owner TIANJIN UNIV
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