Blue fluorescent silver nanocluster as well as preparation method and application thereof

A technology of silver nanoclusters and blue fluorescence, applied in nanotechnology, nanotechnology, nano-optics, etc., can solve the problems of low sensitivity, complicated operation, expensive instruments, etc., and achieve high sensitivity, simple operation, and short reaction time Effect

Active Publication Date: 2021-01-05
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these methods are time-consuming, costly, expensiv...

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  • Blue fluorescent silver nanocluster as well as preparation method and application thereof
  • Blue fluorescent silver nanocluster as well as preparation method and application thereof
  • Blue fluorescent silver nanocluster as well as preparation method and application thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0040]Mix 100mL 0.1mol / L histidine aqueous solution and 1mL 0.25mol / L silver nitrate solution at room temperature (nSilver nitrate :nHistidine =1:40), after magnetic stirring for 10 minutes, react in a microwave oven with a power of 700W for 4 minutes, and the reaction mixture was dialyzed with a dialysis membrane with a molecular mass of 500da for 24 hours to obtain fluorescent silver nanoclusters.

[0041]The fluorescence emission peak of this silver nanocluster is about 450nm. When observed under a black background under ultraviolet light, it shows blue fluorescence with a fluorescence intensity of 4.27×104, The quantum yield is 1.3%. The luminescence intensity stability at 450nm was tested within 60 minutes, and the fluorescence intensity value remained basically unchanged after 60 minutes, indicating that the silver nanoclusters have good photobleaching resistance.

Embodiment 2

[0043]Mix 100mL 0.1mol / L histidine aqueous solution and 1mL 0.25mol / L silver nitrate solution at room temperature (nSilver nitrate :nHistidine =1:40), after magnetic stirring for 10 minutes, react in a microwave oven with 700W power for 8 minutes, and the reaction mixture was dialyzed with a dialysis membrane with a molecular mass of 500da for 24 hours to obtain fluorescent silver nanoclusters.

[0044]The fluorescence emission peak of this silver nanocluster is around 450nm, and when observed under a black background under ultraviolet light, it shows blue fluorescence with a fluorescence intensity of 6.15×104, The quantum yield is 1.8%. The luminescence intensity stability at 450nm was tested within 60 minutes, and the fluorescence intensity value remained basically unchanged after 60 minutes, indicating that the silver nanoclusters have good photobleaching resistance.

Embodiment 3

[0046]Mix 100mL 0.125mol / L histidine aqueous solution and 1mL 0.25mol / L silver nitrate solution at room temperature (nSilver nitrate :nHistidine =1:50), after magnetic stirring for 10 minutes, react in a microwave oven with a power of 700W for 4 minutes, and the reaction mixture was dialyzed with a dialysis membrane with a molecular mass of 500da for 24 hours to obtain fluorescent silver nanoclusters.

[0047]The fluorescence emission peak of this silver nanocluster is around 440nm. When observed under a black background under ultraviolet light, it shows blue fluorescence with a fluorescence intensity of 7.94×104, The quantum yield is 2.4%. The luminescence intensity stability at 440nm was tested within 60 minutes, and the fluorescence intensity value remained basically unchanged after 60 minutes, indicating that the silver nanoclusters have good photobleaching resistance.

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Abstract

The invention discloses a blue fluorescent silver nanocluster as well as a preparation method and application thereof, and belongs to the technical field of fluorescent nano materials. The fluorescentsilver nanocluster solution is prepared by taking histidine as a reducing agent and a protective agent and a silver nitrate solution as a matrix through a microwave synthesis method. The preparationmethod is simple in system operation, short in reaction time, environment-friendly and good in repeatability, and does not need to use a common reducing agent or other chemical reagents. The silver nanocluster is good in stability, good in water solubility and low in toxicity, has high-sensitivity response to copper ions and iron ions under different pH values, can be applied to high-sensitivity and high-selectivity detection of the copper ions or the iron ions, is simple and rapid in detection process and high in detection result accuracy, and can be used for constructing a sensing system fordetecting the copper ions and the iron ions.

Description

Technical field[0001]The invention belongs to the technical field of fluorescent nanomaterials, and specifically relates to a blue fluorescent silver nanocluster and a preparation method and application thereof, in particular to the application in the detection of copper and iron ions.Background technique[0002]Heavy metals include gold, silver, copper, iron, mercury, lead, cadmium, etc., among which copper and iron are essential micronutrients for human health. Copper is essential for blood, central nervous system and immune system, hair, skin and bone tissues, brain and liver. The development and function of internal organs such as heart and heart have an important influence. Iron is an important part of hemoglobin and plays a role in transporting oxygen in the blood. However, excessive accumulation of copper and iron in the human body can also lead to heavy metal poisoning. Excessive copper ions can have a toxic effect on brain neurons, leading to serious diseases such as Alzheime...

Claims

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Application Information

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IPC IPC(8): C09K11/58B82Y20/00B82Y40/00G01N21/64B22F9/24B22F1/00
CPCC09K11/58B82Y20/00B82Y40/00G01N21/6402G01N21/643B22F9/24B22F1/054
Inventor 陈国庆商云鹏高辉朱纯吴亚敏马超群李磊辜姣朱焯炜朱拓
Owner JIANGNAN UNIV
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