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A kind of blue fluorescent silver nanocluster and its preparation method and application

A silver nanocluster, blue fluorescence technology, applied in nanotechnology, nano-optics, nanotechnology and other directions, can solve the problems of low sensitivity, low selectivity, complex operation, etc., achieve high quantum yield, short reaction time, The effect of accurate detection results

Active Publication Date: 2021-11-02
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these methods are time-consuming, costly, expensive instruments, complicated operation, low sensitivity and low selectivity

Method used

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  • A kind of blue fluorescent silver nanocluster and its preparation method and application
  • A kind of blue fluorescent silver nanocluster and its preparation method and application
  • A kind of blue fluorescent silver nanocluster and its preparation method and application

Examples

Experimental program
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 (n 硝酸银 :n 组氨酸 =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 for 24 hours using a dialysis membrane with a molecular mass of 500da to obtain fluorescent silver nanoclusters.

[0041] The fluorescence emission peak of the silver nanocluster is around 450nm, and when observed with a black background under an ultraviolet lamp, it presents blue fluorescence with a fluorescence intensity of 4.27×10 4 , with a quantum yield of 1.3%. The stability of the luminescence intensity at 450nm within 60 minutes was detected, and the fluorescence intensity value remained basically unchanged after 60 minutes, indicating that the silver nanocluster has 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 (n 硝酸银 :n 组氨酸 =1:40), after magnetic stirring for 10 minutes, react in a microwave oven with a power of 700W for 8 minutes, and the reaction mixture was dialyzed for 24 hours using a dialysis membrane with a molecular mass of 500da to obtain fluorescent silver nanoclusters.

[0044] The fluorescence emission peak of the silver nanocluster is around 450nm, and when observed with a black background under an ultraviolet lamp, it presents blue fluorescence with a fluorescence intensity of 6.15×10 4 , with a quantum yield of 1.8%. The stability of the luminescence intensity at 450nm within 60 minutes was detected, and the fluorescence intensity value remained basically unchanged after 60 minutes, indicating that the silver nanocluster has 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 (n 硝酸银 :n 组氨酸 =1:50), after magnetic stirring for 10min, react in a microwave oven with a power of 700W for 4min, and the reaction mixture was dialyzed for 24 hours using a dialysis membrane with a molecular mass of 500da to obtain fluorescent silver nanoclusters.

[0047] The fluorescence emission peak of the silver nanocluster is around 440nm, and when observed with a black background under an ultraviolet lamp, it presents blue fluorescence with a fluorescence intensity of 7.94×10 4 , with a quantum yield of 2.4%. The stability of the luminescence intensity at 440nm within 60 minutes was detected, and the fluorescence intensity value remained basically unchanged after 60 minutes, indicating that the silver nanocluster has good photobleaching resistance.

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Abstract

The invention discloses a blue fluorescent silver nanocluster, a preparation method and application thereof, and belongs to the technical field of fluorescent nanomaterials. The present invention uses histidine as the reducing agent and protective agent, silver nitrate solution as the matrix, and prepares the fluorescent silver nanocluster solution through microwave synthesis. Reproducible without the use of commonly used reducing agents or other chemical reagents. The obtained silver nanoclusters have good stability, good water solubility, and low toxicity. At the same time, they have high sensitivity responses to copper ions and iron ions at different pH values, and can be applied to detect copper or iron ions with high sensitivity and high selectivity. , and the detection process is simple and fast, and the detection result is highly accurate, and can be used to construct a sensing system for detecting copper ions and iron ions.

Description

technical field [0001] The invention belongs to the technical field of fluorescent nanometer materials, and in particular relates to a blue fluorescent silver nanocluster and its preparation method and application, especially 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 them, copper and iron are indispensable micronutrients for human health, and copper is essential for blood, central nervous system and immune system, hair, skin and bone tissue, as well as brain and liver Iron is an important component of hemoglobin, which 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, which can lead to serious diseases such as Alzheimer's disease, Wilson's disease and Parkinson's disease; if c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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