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Preparation method and application of aggregation-induced luminescent silver nanoclusters

A technology of silver nanoclusters and aggregation induction, which is applied in nanotechnology, nanotechnology, nano-optics, etc., can solve the problems of short fluorescence lifetime, low fluorescence quantum yield, cumbersome preparation process, etc., and achieve uniform particle size distribution and preparation Simple process and environment-friendly effect

Active Publication Date: 2019-12-20
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a preparation method and application of aggregation-induced luminescent silver nanoclusters, aiming to overcome the cumbersome preparation process, low fluorescence quantum yield and The defect of short fluorescence lifetime

Method used

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  • Preparation method and application of aggregation-induced luminescent silver nanoclusters
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  • Preparation method and application of aggregation-induced luminescent silver nanoclusters

Examples

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Embodiment 1

[0029] A method for preparing aggregation-induced luminescent silver nanoclusters, comprising the following steps: mixing 5mL of 20mmol / L N-acetyl-L-cysteine ​​aqueous solution with 20mL of 2.5mmol / L silver nitrate aqueous solution, and mixing the mixed solution Stir evenly and control the heating temperature to 60° C. to reflux for 24 hours, take it out after cooling, and freeze-dry to obtain aggregation-induced luminescent silver nanoclusters. The fluorescence emission peak of the aggregation-induced luminescent silver nanocluster is around 516nm, and when observed with a black background under ultraviolet light, it presents relatively strong green fluorescence with a quantum yield of 0.35 and a fluorescence lifetime of 9.15 μs.

Embodiment 2

[0031] A method for preparing aggregation-induced luminescent silver nanoclusters, comprising the following steps: mixing 5mL of 20mmol / L N-acetyl-L-cysteine ​​aqueous solution with 20mL of 2.5mmol / L silver nitrate aqueous solution, and mixing the mixed solution Stir evenly and control the heating temperature to 70° C. to reflux for 24 hours, take it out after cooling, and freeze-dry to obtain aggregation-induced luminescent silver nanoclusters. The fluorescence emission peak of the aggregation-induced luminescent silver nanocluster is around 494nm, and when observed with a black background under ultraviolet light, it presents strong blue-green fluorescence with a quantum yield of 0.40 and a fluorescence lifetime of 10.55 μs.

Embodiment 3

[0033]A method for preparing aggregation-induced luminescent silver nanoclusters, comprising the following steps: mixing 17.5mL of 20mmol / L N-acetyl-L-cysteine ​​aqueous solution with 20mL of 2.5mmol / L silver nitrate aqueous solution, mixing Stir the solution evenly and control the heating temperature to 80° C. to reflux for 48 hours, take it out after cooling, and freeze-dry to obtain aggregation-induced luminescent silver nanoclusters. The fluorescence emission peak of the aggregation-induced luminescent silver nanocluster is around 492nm, and when observed with a black background under ultraviolet light, it presents strong blue-green fluorescence with a quantum yield of 0.39 and a fluorescence lifetime of 9.22μs.

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Abstract

The invention discloses a preparation method and application of aggregation-induced luminescent silver nanoclusters. The preparation method comprises the steps of mixing, in volume by parts, 5-17.5 parts of an N-acetyl-L-cysteine aqueous solution with the concentration of 20 mmol / L and 20 parts of a silver nitrate solution with the concentration of 2.5 mmol / L, uniformly stirring the mixture, controlling the heating temperature to be 60-80 DEG C, and refluxing for 12-48 hours; and taking the mixture out after cooling, and carrying out freeze-drying to obtain the aggregation-induced luminescentsilver nanoclusters, wherein the fluorescence quantum yield can reach 0.44. The preparation method is simple in process and reaction conditions, and environment-friendly; the prepared aggregation-induced luminescence silver nanoclusters are good in aggregation-induced luminescence property, high in fluorescence quantum yield, long in microsecond service life, high in Ag (I) contents and applicableto detecting tetracycline.

Description

technical field [0001] The invention relates to the preparation of silver nanoclusters, in particular to a preparation method and application of aggregation-induced luminescent silver nanoclusters. Background technique [0002] Tetracycline (TC) is a broad-spectrum antibacterial drug discovered in the middle of the 20th century. Tetracycline has been widely used in the medical industry, aquaculture industry, and meat processing industry due to its advantages of various antibacterial properties, low cost, and good oral absorption. However, after investigation, when tetracycline circulates in the environment, it will cause ecological pollution on the one hand, and on the other hand, after contacting microorganisms or bacteria in the environment, microorganisms or bacteria will produce resistance genes, thereby reducing the ability of tetracycline to inhibit bacteria. What's more serious is that the microorganisms that produce antibiotic resistance can directly or indirectly e...

Claims

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Application Information

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IPC IPC(8): C09K11/58B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/58G01N21/6428G01N2021/6417G01N2021/6432
Inventor 张彦吕玫高鹏飞李天栋双少敏张国梅董川
Owner SHANXI UNIV
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