Preparation method of quantum dot/zeolite imidazole metal organic framework composite material

A metal-organic framework and composite material technology, which is applied in the field of preparation of quantum dots/zeolite-like imidazole-like metal-organic frameworks (MOFs) composite materials, can solve the problems of limited biomedical diagnostic applications, small size of quantum dots, difficult separation and purification, etc. , to achieve the effect of enhancing stability, increasing uniformity, and enhancing electronic conduction

Active Publication Date: 2021-04-06
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the size of quantum dots is small (2-10 nm), and it is difficult to separate and purify after coupling with small biomolecules such as nucleic acids or proteins
At the same time, most

Method used

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  • Preparation method of quantum dot/zeolite imidazole metal organic framework composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A quantum dot / zeolite-like imidazole metal-organic framework composite material, using the metal-organic framework structure MOFs of zeolite-imidazole-like metal-organic framework as a carrier, and growing the composite material of quantum dots in situ inside it, prepared according to the following steps:

[0024] 1) Zinc nitrate hexahydrate and 2-methylimidazole were selected as ZIF-8 synthetic materials, 7.5 g of 2-methylimidazole was dissolved in 9 mL of aqueous solution, and stirred evenly at 37 °C; 1 mL of Zinc nitrate hexahydrate (125 mg) solution, and then the mixture was reacted at 37°C with a stirring speed of 400 rpm / min for 30 min; after the reaction, centrifuged at 5000 rpm / min for 30 min to remove the supernatant, washed three times to obtain ZIF- 8 Nanoparticles (MOFs);

[0025] 2) Dissolve 0.5g of MOFs in 20 mL of ammonium chloride solution with a concentration of 0.1M, stir at room temperature for 4 hrs to obtain a precipitate, wash with ultrapure water ...

Embodiment 2

[0031] A quantum dot / zeolite-like imidazole metal-organic framework composite material, which is similar to the steps in Example 1, and is prepared according to the following steps:

[0032] 1) Zinc nitrate hexahydrate and 2-methylimidazole were selected as ZIF-8 synthetic materials, 7.5 g 2-methylimidazole was dissolved in 9 mL aqueous solution, and stirred evenly at 37 ° C; 1 mL was added to the above solution Zinc nitrate hexahydrate (125 mg) solution, and then the mixture was reacted at 37°C with a stirring speed of 400 rpm / min for 30 min; after the reaction, centrifuged at 5000 rpm / min for 30 min to remove the supernatant, washed three times to obtain ZIF- 8 Nanoparticles (MOFs);

[0033] 2) Fully dissolve 0.75 MOFs in 20 mL of 0.1M ammonium chloride solution, stir at room temperature for 3 hrs, centrifuge and wash with ultrapure water, and dissolve the obtained precipitate in 15 mL of ultrapure water to obtain an aqueous solution;

[0034] 3) Dissolve 0.5 g of zinc nitr...

Embodiment 3

[0038] A quantum dot / zeolite-like imidazole metal-organic framework composite material, which is similar to the steps in Example 1, and is prepared according to the following steps:

[0039] 1) Zinc nitrate hexahydrate and 2-methylimidazole were selected as ZIF-8 synthetic materials, 8 g of 2-methylimidazole was dissolved in 9 mL of aqueous solution, and stirred evenly at 37 ° C; 1 mL of hexahydrate was added to the solution Zinc nitrate hydrate (150 mg) solution, and then the mixed solution was reacted at 37°C with a stirring speed of 400 rpm / min for 30 min; after the reaction, centrifuged at 5000 rpm / min for 30 min to remove the supernatant, washed three times to obtain ZIF-8 Nanoparticles (MOFs);

[0040] 2) Dissolve 1 g of MOFs in 20 mL of 0.1M ammonium chloride solution, stir at room temperature for 2 hr, centrifuge and wash with ultrapure water, and dissolve the obtained precipitate in 15 mL of ultrapure water to obtain an aqueous solution;

[0041] 3) 0.5 g of quantum ...

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Abstract

The invention relates to a preparation method of a quantum dot/zeolite imidazole metal-organic frameworks (MOFs) composite material, in particular to a preparation method of a composite material which takes a zeolite imidazole metal-organic framework structure as a carrier and in-situ grows quantum dots inside the zeolite imidazole metal-organic framework structure. The method has the advantages that the quantum dots are synthesized in situ in the metal organic framework in an ion exchange mode, the quantum dots grow in the pore diameter of the MOFs material in a limited mode, the uniformity of the synthesized quantum dots is improved, and the stability of the quantum dots in an aqueous solution is also improved through the MOFs shell. The prepared composite material is enhanced in electron conduction, stable in fluorescence property and good in biocompatibility, and can meet the requirements of biological detection and imaging application.

Description

technical field [0001] The invention relates to a preparation method of a quantum dot / zeolite imidazole metal organic framework (MOFs) composite material. Specifically, it relates to a method for in-situ growth of quantum dots inside a zeolite imidazole metal organic framework material. The invention belongs to the field of nanometer materials and novel quantum dots. Background technique [0002] Quantum dots (quantum dots, QDs) are a new type of fluorescent nanomaterials, with broadband absorption and narrow-band emission, emission wavelength adjustable with particle size, large two-photon absorption cross-section, long fluorescence lifetime and high fluorescence intensity and other excellent photochemical properties. In recent years, it has been widely used in biomedical fields such as cell and in vivo imaging, and immunochromatographic detection. In particular, it has great application prospects in high-sensitivity and high-throughput biological analysis and detection. ...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/06C09K11/56B82Y20/00B82Y30/00B82Y40/00G01N21/64
CPCC09K11/025C09K11/06C09K11/565B82Y20/00B82Y30/00B82Y40/00G01N21/6428
Inventor 崔大祥徐艳徐颖湉朱君杨迪诚
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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