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A green fluorescent silver nanocluster and its preparation method and application

A technology of silver nanoclusters and green fluorescence, applied in nanotechnology, fluorescence/phosphorescence, chemical instruments and methods, etc., to achieve high sensitivity, small size, and accurate detection results

Active Publication Date: 2021-03-30
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most silver nanoclusters need to add reducing agents such as sodium borohydride and ascorbic acid during the preparation process, or reduce them by ultraviolet radiation. Some methods also add chemical reagents such as surfactants and sodium hydroxide during the preparation process. Some reported silver nanoclusters emit blue light under ultraviolet light excitation

Method used

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  • A green fluorescent silver nanocluster and its preparation method and application
  • A green fluorescent silver nanocluster and its preparation method and application
  • A green fluorescent silver nanocluster and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Example 1: 1 mL of 2 mmol / L silver nitrate solution and 1 mL of 0.05 mol / L histidine aqueous solution were mixed and shaken, and stirred continuously for 12 h with a magnetic stirrer. Then, the reaction mixture was centrifuged at 10,000 rpm for 10 min, and the supernatant was collected to obtain fluorescent silver nanoclusters. The fluorescence emission peak of the silver nanocluster is around 480 nm, and when observed with a black background under an ultraviolet lamp, it presents green fluorescence with a quantum yield of 4.2%.

Embodiment 2

[0015] Example 2: 1 mL of 8 mmol / L silver nitrate solution and 5 mL of 0.25 mol / L histidine aqueous solution were mixed and shaken, and stirred continuously for 48 h with a magnetic stirrer. Then, the reaction mixture was centrifuged at 10,000 rpm for 10 min, and the supernatant was obtained to obtain fluorescent silver nanoclusters. The fluorescence emission peak of the silver nanocluster is around 480 nm, and when observed with a black background under an ultraviolet lamp, it presents green fluorescence with a quantum yield of 4.5%.

Embodiment 3

[0016] Example 3: 1 mL of 10 mmol / L silver nitrate solution and 8 mL of 0.1 mol / L histidine aqueous solution were mixed and shaken, and stirred continuously with a magnetic stirrer for 24 h, then, the reaction mixture was centrifuged at 10,000 rpm for 10 min to obtain supernatant to obtain fluorescent silver nanocluster solution.

[0017] The silver nanocluster aqueous solution was dropped on a copper grid with a carbon film, and tested after vacuum drying. The average particle size of the fluorescent silver nanoclusters was measured to be 1.8 nm, and the particle size distribution was uniform, such as figure 1 shown. Add the silver nanocluster stock solution (100 μL) and 1 mL of phosphate buffer solution (PBS, pH=7, 0.01 mol / L) into the fluorescence cuvette, and measure its ultraviolet absorption spectrum and fluorescence excitation and emission spectra, such as figure 2 As shown, the maximum fluorescence excitation and emission peaks of the silver nanoclusters are around 3...

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Abstract

The invention belongs to the technical field of fluorescent nano materials, and provides a green fluorescent silver nanocluster with simple operation, mild conditions and high quantum yield, and a preparation method thereof; the prepared green fluorescent silver nanocluster is simple in synthesis method and can avoid interference of autofluorescence of organisms, has high sensitivity to tetracycline, and can be used for constructing a sensing system for detecting the tetracycline. A fluorescent silver nanocluster solution is prepared by a one-pot method by using histidine as a protective agentand a reducing agent and a silver nitrate solution as a matrix at the room temperature. The addition of a commonly used reducing agent sodium borohydride, ascorbic acid and a surfactant is avoided, and the preparation method has the advantages of simple and easy operation, mild conditions and environment friendliness; the prepared silver nanocluster has good water solubility, high quantum yield and low toxicity, and can be applied to the detection of tetracycline with high sensitivity and high selectivity, and the detection process is simple and rapid, and the detection result is accurate.

Description

technical field [0001] The invention belongs to the technical field of fluorescent nanometer materials, and in particular relates to a green fluorescent silver nanocluster and its preparation method and application, especially the application in tetracycline detection. Background technique [0002] Tetracycline is a broad-spectrum antibacterial antibiotic produced by actinomycetes. Since it came out in 1948, it has been widely used in the clinical treatment of non-infectious diseases because of its low cost and good antibacterial and anti-inflammatory effects. In addition, tetracyclines, as antibiotics and growth promoters, have been widely used as veterinary drugs or feed additives to prevent and treat bacterial infections or to promote the growth of livestock. However, the abuse of tetracycline can produce bacterial resistance, and it may also cause serious liver damage, kidney damage, yellowing of teeth, allergic reactions, and side effects such as dizziness, nausea, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24C09K11/58B82Y40/00G01N21/64
CPCB22F9/24B82Y40/00C09K11/58G01N21/64G01N21/6428G01N21/643G01N2021/6417G01N2021/6432
Inventor 张彦牛琴琴高鹏飞张国梅双少敏董川
Owner SHANXI UNIV
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