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Quantum dot fluorescent nanospheres based on amphiphilic silicon carrier and preparation method thereof

A fluorescent nanometer and quantum dot technology, which is applied in nanotechnology, nanotechnology, nano-optics, etc. for materials and surface science, can solve the cumbersome preparation process of quantum dot fluorescent nanospheres, poor controllability of size and particle size distribution, Fluorescence intensity is easy to lose and other problems, to achieve the effects of controllable quantum dot coating amount and size, scaling size, quantum dot coating amount, and regular shape

Active Publication Date: 2022-07-26
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the cumbersome preparation process of the existing quantum dot fluorescent nanospheres and the easy loss of fluorescence intensity, the present invention provides an amphiphilic silicon carrier with regular shape, controllable quantum dot coating amount and size, high luminescence and stable performance. quantum dot fluorescent nanosphere
[0007] The invention aims to overcome the poor controllability of the size and particle size distribution of the microspheres existing in the existing synthesis process of quantum dot fluorescent nanospheres, ligand replacement on the surface of quantum dots during the phase inversion process, and fluorescence intensity easily caused by by-products or additives. For the problem of serious loss, a preparation method of quantum dot fluorescent nanospheres based on amphiphilic silicon carrier is provided. This method uses the amphiphilic carrier formed by the hydrolysis and condensation of hydrophobic silane precursors to directly and efficiently water-soluble Modification, the size of nanospheres and the coating amount of quantum dots can be effectively scaled by simply adjusting the concentration of quantum dots

Method used

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  • Quantum dot fluorescent nanospheres based on amphiphilic silicon carrier and preparation method thereof
  • Quantum dot fluorescent nanospheres based on amphiphilic silicon carrier and preparation method thereof
  • Quantum dot fluorescent nanospheres based on amphiphilic silicon carrier and preparation method thereof

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Effect test

Embodiment 1

[0040] (1) Take 750 μL of hexadecylamine and trioctylphosphine oxide co-modified cadmium selenide / zinc sulfide quantum dot stock solution (2.1×10 -5 mol / L), an equal volume of methanol was added to precipitate the quantum dots. After centrifugation, the supernatant was discarded, the precipitate was slightly dried in the air, and then 40 μL of n-octyltriethoxysilane was added to obtain an orange transparent solution after fully dissolving, which was the quantum dot-organosilane precursor;

[0041] (2) Transfer the quantum dot-organosilane precursor into a glass bottle, add 40 mL of water and 60 μL of ammonia water (28 wt%); extend the ultrasound probe (diameter 6 mm) below the liquid surface, set the amplitude to 30%, and 5s ultrasonic / 3s pause is the working cycle, ultrasonic treatment is performed for 1h, and the quantum dot micelle solution is obtained;

[0042] (3) The quantum dot micelle solution was filtered through a 0.22 μm microporous membrane, and 1.6 mL of sodium s...

Embodiment 2

[0045] The difference between Example 2 and Example 1 is that step (4) is added: the above-mentioned CdSe / ZnS@SiO is concentrated with an ultrafiltration centrifuge tube 2 Coarse solution of fluorescent nanospheres until the absorbance of quantum dots (at the position of its exciton absorption peak) reaches about 0.1. Then 3 mL of the above solution was added to 12 mL of ethanol, 0.2 mL of ammonia water and 15 μL of ethyl orthosilicate mixture, and the reaction was slowly stirred for 6 h to coat the silica layer to obtain the CdSe / ZnS@ after the growth of the silica shell layer. SiO 2 Quantum dot fluorescent nanospheres.

[0046] image 3 are oil-soluble cadmium selenide / zinc sulfide quantum dots (a) and CdSe / ZnS@SiO obtained in Example 2 after growing silica shell 2 Transmission electron microscope image of quantum dot fluorescent nanospheres (b), it can be seen that the oil-soluble cadmium selenide / zinc sulfide quantum dots with uniform particle size and good monodispersi...

Embodiment 3

[0048] (1) Take 400 μL of hexadecylamine and trioctylphosphine oxide co-modified cadmium selenide / zinc sulfide quantum dot stock solution (2.1×10 -5 mol / L), an equal volume of methanol was added to precipitate the quantum dots. After centrifugation, the supernatant was discarded, the precipitate was slightly dried in the air, and then 40 μL of n-octyltriethoxysilane was added to obtain an orange transparent solution after fully dissolving, which was the quantum dot-organosilane precursor;

[0049] (2) The quantum dot-organosilane precursor was transferred into a glass bottle, and 40 mL of water and 60 μL of ammonia water (28 wt %) were added. Extend the ultrasonic probe (diameter 6mm) below the liquid surface, set the amplitude to 30%, take 5s ultrasonic / 3s pause as the working cycle, and ultrasonically process for 1h to obtain the quantum dot micelle solution;

[0050] (3) The quantum dot micelle solution was filtered through a 0.22 μm microporous membrane, and 1.6 mL of sod...

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Abstract

The invention relates to the technical field of fluorescent nanomaterials. In order to solve the problems of complicated preparation process and easy loss of fluorescence intensity of the existing quantum dot fluorescent nanospheres, an amphiphilic silicon carrier-based quantum dot fluorescent nanosphere and a preparation method thereof are provided. The quantum dot fluorescent nanospheres of the amphiphilic silicon carrier are formed by coating the surface of cadmium selenide / zinc sulfide quantum dots co-modified with hexadecylamine and trioctylphosphine oxide with a silicon dioxide layer. The quantum dot fluorescent nanosphere of the invention has regular shape, controllable quantum dot coating amount and size, high luminescence and stable performance; the preparation method is simple, and the size of the nanosphere and the quantum dot coating amount can be effectively scaled by adjusting the quantum dot concentration. Through the controllable silica shell growth, more surface functional modification and assembly are expected to be realized.

Description

technical field [0001] The invention relates to the technical field of fluorescent nanomaterials, in particular to a quantum dot fluorescent nanosphere based on oil phase quantum dots and an amphiphilic silicon carrier and a preparation method thereof. Background technique [0002] Quantum dots (QDs), as a new type of nanoluminescent materials, have the characteristics of high luminescence intensity, wavelength tunability, resistance to photobleaching, and high color purity. . At present, the methods of synthesizing quantum dots are mainly divided into two categories: aqueous phase synthesis and organic phase synthesis. Water-soluble quantum dots have advantages in biocompatibility, but their quantum efficiency is low, fluorescence stability is generally poor, and particle size distribution is wide. Oil-soluble quantum dots synthesized by organic phase high-temperature thermal injection have a typical core-shell structure, high fluorescence quantum yield, and excellent pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/88B82Y20/00B82Y30/00
CPCC09K11/025C09K11/883B82Y20/00B82Y30/00
Inventor 黄亮金洁宁胡军汪晶
Owner ZHEJIANG UNIV OF TECH
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