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Quantum dot-agarose composite microsphere and preparation method thereof

A technology of agarose gel microspheres and composite microspheres, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of insufficient chemical stability of quantum dot composite microspheres, low quantum dot concentration, quantum dot leakage and the like, Achieve the effect of facilitating promotion and application, stabilizing chemical properties, and avoiding leakage

Inactive Publication Date: 2013-04-17
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the existing quantum dot composite microspheres, the concentration of quantum dots is relatively low (the coating amount is small), and some chemical properties are unstable, and quantum dots are prone to leakage.

Method used

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  • Quantum dot-agarose composite microsphere and preparation method thereof
  • Quantum dot-agarose composite microsphere and preparation method thereof
  • Quantum dot-agarose composite microsphere and preparation method thereof

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Embodiment 1

[0030] A quantum dot-agarose composite microsphere of the present invention, which uses honeycomb-shaped agarose gel microspheres (average particle diameter of 35 mm) as the matrix, and the pores of the matrix are filled with CdSe modified by mercaptoethylamine / ZnS quantum dots (that is, mercaptoethylamine-CdSe / ZnS quantum dots), a layer of polyethyleneimine is attached to the inner wall of the matrix pores, and the amine groups in polyethyleneimine are combined with mercaptoethylamine-CdSe / ZnS quantum dots through the aldehyde group The amine groups on the dots are cross-linked into one, and the average number of mercaptoethylamine-CdSe / ZnS quantum dot particles filled on a single agarose gel microsphere is 6.0×10 7 .

[0031] The quantum dot-agarose composite microspheres of this embodiment are specifically prepared through process steps:

[0032] (1) Preparation of mixed solution: Prepare 10 mL of fluorescence emission wavelength at 602 nm and concentration of 10 -6 M's ...

Embodiment 2

[0039] A group (five types) of quantum dot-agarose composite microspheres of the present invention are all based on honeycomb-shaped agarose gel microspheres (average particle diameter is 35mm), and the pores of the matrix are filled with mercaptoethylamine-modified microspheres. After CdTe quantum dots, each quantum dot is composed of different molar ratios (4:0, 4:0.5, 4:1, 2:1, 0:1, and different molar ratios are combined to express quantum dots of different colors. ) of two kinds of CdTe quantum dots with fluorescence emission wavelengths of 543nm and 602nm are combined, and a layer of polyethyleneimine is attached to the inner wall of each matrix. The amine groups on the CdTe quantum dots are cross-linked into one, and the average number of mercaptoethylamine-CdTe quantum dot particles filled on a single agarose gel microsphere is 1.0×10 8 .

[0040] The method for preparing five kinds of mercaptoethylamine-CdTe quantum dots-agarose composite microspheres of this embodim...

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Abstract

The invention discloses a quantum dot-agarose composite microsphere. The composite microsphere is based on a honeycomb-shaped agarose gel microsphere, and the pores of the matrix are filled with modified quantum dots. Layer polyethyleneimine, the amine group in polyethyleneimine is cross-linked with the amine group on the modified quantum dot through the aldehyde group; the composite microsphere quantum dot concentration of the present invention is high (large coating amount), chemical properties It is stable and can avoid the leakage of quantum dots; the invention also discloses a preparation method of the quantum dot-agarose composite microspheres correspondingly, including the preparation of mixed solution, adding filling medium and adding cross-linking agent and other process steps; the preparation method The operation is simple, convenient for popularization and application, and no special modification with polymer gel is required.

Description

technical field [0001] The invention mainly relates to quantum dot composite microspheres, in particular to quantum dot-agarose composite microspheres and a preparation method thereof. Background technique [0002] Quantum dots (Quantum Dots, QDs), also known as semiconductor nanocrystals (Semiconductor Nanocrystal), are nanocrystals composed of II-VI or III-V elements with a size of 1nm to 20nm. Quantum dots have excellent properties such as large molar absorptivity, wide and continuous excitation wavelength, narrow and symmetrical emission wavelength, large Stokes shift, long fluorescence lifetime, and not easy to photobleaching, and their fluorescence spectrum changes with the size and shape of quantum dots. , Therefore, quantum dots are widely used in biomarkers, light-emitting diodes, lasers, solar cells and other optoelectronic devices and information storage and other fields. Agarose is a polysaccharide polymer with β-D-galactopyranose and α-L-galactopyranose as stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/88C09K11/02
Inventor 王柯敏羊小海刘剑波翦立新
Owner HUNAN UNIV
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