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Multi-layer wrapped quantum dot core-shell composite particle, preparation method and application of core-shell composite particle

A technology of composite particles and quantum dots, applied in chemical instruments and methods, semiconductor devices, luminescent materials, etc., can solve the problems of absorption or offset, hindering applied research, quantum dot quantum efficiency and luminescent properties of the coating layer weakening, etc. The effect of high brightness, avoiding fluorescence quenching, and good application prospects

Active Publication Date: 2017-10-27
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the quantum efficiency and luminescence characteristics of quantum dots after wrapping by existing technologies are affected by the weakening, absorption or offset of the wrapping layer, which hinders its further application research.

Method used

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  • Multi-layer wrapped quantum dot core-shell composite particle, preparation method and application of core-shell composite particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Ultrasonic disperse the zinc sulfide-wrapped cadmium sulfide quantum dots in deionized water. After 40 minutes, add the mixed solution of styrene and PVP. After fully stirring, slowly add the KPS solution, stir evenly in a 70°C water bath for 7 hours, then put it in an ice bath to stop the reaction . The PS-wrapped cadmium sulfide quantum dots were obtained after the sample was centrifuged and washed three times with absolute ethanol. The mixed solution of styrene and PVP is prepared by mixing 6.5ml styrene with 0.18g PVP plus 45ml water. KPS solution is prepared by 0.1g KPS and 5ml water.

[0069] After ultrasonically dispersing the above-mentioned PS-wrapped quantum dots for 40 min, wash and centrifuge three times with alcohol. The centrifugal speed is 8000 rpm, and the centrifugation time is 6 minutes; add concentrated sulfuric acid for sulfonation, the sulfonation temperature is 40°C, and the sulfonation time is 7 hours; the amount of concentrated sulfuric acid ad...

Embodiment 2

[0072] The cadmium selenide quantum dots were ultrasonically dispersed in absolute ethanol, ammonia water was added and magnetically stirred at 40° C. for 30 min to obtain an ammonia water mixture. Then, 2.2 ml of tetraethyl orthosilicate (TEOS) solution was added dropwise to the mixed liquid. Magnetic stirring was carried out at 40° C. for 8 hours to obtain a milky white mixed liquid. Finally, the samples were centrifuged three times with deionized water to obtain SiO 2 Wrapped quantum dots.

[0073] SiO will be obtained 2 After the wrapped quantum dots were ultrasonicated in deionized water for 50 minutes, they were purified by centrifugation at a centrifugal speed of 8000 rpm and a centrifugation time of 6 minutes; a silane coupling agent was added for surface modification. Add 1.183ml of silane coupling agent Y-aminopropyltrimethoxysilane coupling agent (KH-560) to the specific gravity of 2.4g silica, and stir for 2 hours at 40°C. Finally, it was washed and purified by...

Embodiment 3

[0076] The cadmium sulfide quantum dots were ultrasonically dispersed in deionized water, and the ultrasonic time was 30 minutes. Add the mixed solution of styrene and PVP, and slowly add the KPS solution dropwise after magnetic stirring for 30 minutes. After uniform stirring, react in a 70°C water bath for 7 hours. Place in an ice bath to stop the reaction. The PS-wrapped cadmium sulfide quantum dots were obtained after the sample was centrifuged and washed three times with absolute ethanol. The mixed solution of styrene and PVP is prepared by mixing 6.5ml styrene and 0.4g PVP plus 45ml water; the KPS solution is prepared by mixing 0.25gKPS and 5ml water.

[0077] After the obtained PS-coated quantum dots were sonicated for 50 min, they were washed with alcohol and centrifuged three times. The centrifugation speed is 6000 rpm, and the centrifugation time is 10 minutes; add sulfur trioxide for sulfonation, the sulfonation temperature is 40°C, and the sulfonation time can be 7...

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Abstract

The invention discloses a multi-layer wrapped quantum dot core-shell composite particle and a preparation method of the core-shell composite particle. The preparation method comprises wrapping a transparent inorganic insulating layer on the surface of a quantum dot to obtain an inorganic insulating layer wrapped quantum dot; connecting the inorganic insulating layer with a reductive group and performing surface modification to obtain a surface activated inorganic insulating layer wrapped quantum dot; and wrapping a precious-metal nano-particle layer on the surface of the surface activated inorganic insulating layer wrapped quantum dot to obtain the multi-layer wrapped quantum dot core-shell composite particle. The multi-layer wrapped quantum dot core-shell composite particle has characteristics of good stability, low biological toxicity, strong fluorescence intensity and high quantum efficiency. The reaction for preparing the multi-layer wrapped quantum dot core-shell composite particle is performed in a solution; high temperature and high pressure are not needed during the whole process; the operation is simple; the yield is high; a large number of multi-layer wrapped quantum dot core-shell composite particles can be prepared at a time; wrapping layers with different thickness can be obtained by controlling the reaction conditions and reaction parameters; and thus the multi-layer wrapped quantum dot core-shell composite particle has a good application prospect.

Description

technical field [0001] The invention relates to a method for preparing core-shell composite particles with high-efficiency multi-layer encapsulation, in particular to a method for encapsulating an inorganic transparent insulating layer and a noble metal nanoparticle layer on the surface of quantum dots. Background technique [0002] Quantum dots can also be called semiconductor nanocrystals. Compared with traditional organic fluorescent dyes, they have excellent spectral properties, such as wide excitation spectrum, narrow and symmetrical emission spectrum, high luminous efficiency, and controllable emission wavelength. In biomedicine, food safety detection, cell biology, molecular biology and other research fields, it has shown extremely broad application prospects. Among them, cadmium-based quantum dots, such as cadmium sulfide and cadmium selenide, have the highest luminous efficiency and are most widely used. However, due to the biological toxicity of cadmium, it is eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/58C09K11/54H01L33/50
Inventor 蔡雯君才滨张哲娟孙卓
Owner EAST CHINA NORMAL UNIV
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