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Luminous silver nanocluster and preparation method and application thereof

A silver nanocluster and solution technology, applied in the field of preparation of green fluorescent silver nanoclusters, can solve problems such as insufficient detection limit

Active Publication Date: 2021-09-10
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008]Currently, the detection limit of Cu2+ generally has a problem that the detection limit is not low enough, such as As shown in Table 1, it is also of great significance to establish a new method for the detection of highly sensitive Cu2+

Method used

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  • Luminous silver nanocluster and preparation method and application thereof
  • Luminous silver nanocluster and preparation method and application thereof
  • Luminous silver nanocluster and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Mix 10ml of 2mmol / L 2-mercapto-5-benzimidazole sodium sulfonate aqueous solution and 10ml of 1mmol / L silver nitrate solution, stir the mixture evenly, add 1 mL of 0.1 mol / L ascorbic acid, stir well and then add The pH of the solution was adjusted to 7 with 0.1 mol / L NaOH, and the heating temperature was controlled at 100 °C to reflux for 24 h. After cooling, it was taken out and purified by dialysis to obtain luminescent silver nanoclusters. The fluorescence emission peak of the luminescent silver nanoclusters is around 520 nm, and when observed with a black background under ultraviolet light, it presents relatively strong green fluorescence, with a quantum yield of 15.2% and a fluorescence lifetime of 7.23 μs.

Embodiment 2

[0037] Mix 10ml of 5mmol / L 2-mercapto-5-benzimidazole sodium sulfonate aqueous solution and 10ml of 1mmol / L silver nitrate solution, stir the mixture evenly, add 1 mL of 0.1mol / L ascorbic acid, stir well and then add The pH of the solution was adjusted to 7 with 0.1 mol / L NaOH, and the heating temperature was controlled at 80 °C to reflux for 20 h. After cooling, it was taken out and purified by dialysis to obtain luminescent silver nanoclusters. The fluorescence emission peak of the luminescent silver nanoclusters is around 520 nm. Under ultraviolet light, when observed with a black background, it presents relatively strong green fluorescence, with a quantum yield of 17.8% and a fluorescence lifetime of 13.25 μs.

Embodiment 3

[0039] Mix 10ml of 11mmol / L 2-mercapto-5-benzimidazole sodium sulfonate aqueous solution and 10ml of 1mmol / L silver nitrate solution, stir the mixture evenly, add 1 mL of 0.1mol / L ascorbic acid, stir well and then add The pH of the solution was adjusted to 7 with 0.1 mol / L NaOH, and the heating temperature was controlled at 60 °C to reflux for 16 h. After cooling, it was taken out and purified by dialysis to obtain luminescent silver nanoclusters. The fluorescence emission peak of the luminescent silver nanoclusters is around 520 nm, and when observed with a black background under ultraviolet light, it presents relatively strong green fluorescence, with a quantum yield of 16.8% and a fluorescence lifetime of 17.12 μs.

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Abstract

The invention relates to a luminous silver nanocluster and a preparation method and application thereof. The preparation method comprises the following steps: mixing 2-14 mmol / L of a 2-sulfydryl-5-benzimidazole sodium sulfonate aqueous solution and 1 mmol / L of a silver nitrate solution in an isovolumetric manner to obtain a mixed solution; and uniformly stirring the mixed solution, adding enough 0.1 mol / L ascorbic acid, uniformly stirring, adding a NaOH solution to adjust the pH value to 7, controlling the heating temperature to be 40-100 DEG C, refluxing for 2-24 hours, cooling, taking out, dialyzing and purifying to obtain the luminous silver nanocluster. The preparation process is simple, reaction conditions are simple, the method is environment-friendly, the prepared luminous silver nanocluster has the advantages of good water solubility, good stability, high quantum yield and the like and can be applied to high-sensitivity and high-selectivity Cu2+ recognition and detection, the detection process is simple, convenient and rapid, and the detection result is accurate.

Description

technical field [0001] The invention relates to the preparation of a silver nanocluster, in particular to a method for preparing a green fluorescent silver nanocluster and its application. Background technique [0002] Copper ions (Cu 2+ ) is the third most abundant transition metal element in the human body, and plays a vital role in both the environment and biological systems, such as the transport of oxygen molecules, activation, and electrical signal conversion. Copper is also a cofactor for many oxidative enzymes (eg, superoxide dismutase) because it can carry out the Cu(I) / Cu(II) conversion and is therefore critical for iron uptake and utilization. However, in vivo Cu 2+ When the content is too high, it may have long-term adverse effects on the liver, kidneys and nervous system, thereby seriously damaging human health and causing diseases such as Alzheimer's disease, Menkes' disease, Parkinson's disease, etc. According to the U.S. Environmental Protection Agency (US...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00G01N21/64B82Y40/00B82Y30/00
CPCB22F9/24G01N21/6428G01N21/6486B82Y40/00B82Y30/00G01N2021/6432
Inventor 张彦吕玫高鹏飞袁明鉴张国梅董川双少敏
Owner SHANXI UNIV
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