Fluorescent metal nanocluster, preparation method and application thereof

A technology of metal nanoclusters and metal nanostructures, applied in nanotechnology, nanotechnology, fluorescence/phosphorescence, etc., can solve problems such as time-consuming, high cost, and complicated operation, and achieve simple preparation methods, low cost, and high specificity The effect of gender identification

Active Publication Date: 2021-10-08
UNIVERSITY OF MACAU
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the detection methods of DTC pesticide residues include high-performance liquid chromatography, mass spectrometry, gas chromatography, chemiluminescence analysis, surface-enhanced Raman scattering spectroscopy, etc., but the above-mentioned methods generally have defects such as high cost, long time consumption, and complicated operation.

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  • Fluorescent metal nanocluster, preparation method and application thereof
  • Fluorescent metal nanocluster, preparation method and application thereof
  • Fluorescent metal nanocluster, preparation method and application thereof

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preparation example Construction

[0023] Some embodiments of the present invention also provide a method for preparing the above-mentioned fluorescent metal nanoclusters, which includes: stably synthesizing the fluorescent metal nanoclusters with metal nickel ions and glutathione ligands.

[0024] Specifically, in some embodiments, the preparation method of the fluorescent metal nanoclusters is: performing a hydrothermal reaction on nickel salt and glutathione to form fluorescent metal nanoclusters.

[0025] Further, in some embodiments, the nickel salt includes but not limited to nickel chloride, nickel sulfate or nickel nitrate, etc., and the molar ratio of the nickel salt to glutathione is 1:1-5. In some embodiments, the preparation method of the fluorescent metal nanocluster is: using NiCl 2 As raw materials, GSH was used as a stabilizer and ascorbic acid was used as a reducing agent to fluoresce metal nanoclusters through a one-pot process.

[0026] In some embodiments, the preparation method of the fluo...

Embodiment 1

[0052] The preparation method of the fluorescent metal nanocluster provided in this embodiment is:

[0053] 10mL NiCl 2 Aqueous solution (20 mM) and 10 mL of GSH aqueous solution (50 mM) were added to 70 mL of ultrapure water, mixed well, and sonicated at room temperature for 5 minutes. Aqueous 1M NaOH was added dropwise to bring the above mixture to pH 10, then 10 mL aqueous ascorbic acid (112 mM) was added dropwise. Then heated and stirred at 90° C. for 24 hours to obtain a light yellow aqueous solution of nickel nanoclusters.

[0054] For further purification, the reaction mixture was lyophilized, and the obtained solid was washed with ethanol three times, and dried by nitrogen blowing to obtain a dark yellow solid, namely fluorescent metal nanoclusters (GSH-Ni NCs). Store the final product in a refrigerator at 4 °C until use.

[0055] Structural characterization of GSH-Ni NCs:

[0056] The UV-Vis absorption spectrum, fluorescence excitation spectrum and fluorescence em...

Embodiment 2

[0060] The preparation method of the fluorescent metal nanocluster provided in this embodiment is:

[0061] 10mL NiCl 2 Aqueous solution (20 mM) and 10 mL of GSH aqueous solution (90 mM) were added to 70 mL of ultrapure water, mixed well, and sonicated at room temperature for 10 minutes. Aqueous 1 M NaOH was added dropwise to bring the above mixture to pH 9, then 10 mL aqueous ascorbic acid (112 mM) was added dropwise. Then heated and stirred at 90° C. for 24 hours to obtain a light yellow aqueous solution of nickel nanoclusters.

[0062] For further purification, the reaction mixture was lyophilized, and the obtained solid was washed with ethanol three times, and dried by nitrogen blowing to obtain a dark yellow solid, namely fluorescent metal nanoclusters (GSH-Ni NCs). Store the final product in a refrigerator at 4 °C until use.

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Abstract

The invention discloses a fluorescent metal nanocluster, a preparation method and application thereof. The fluorescent metal nanocluster comprises a nickel metal nanostructure and a glutathione ligand, wherein the glutathione ligand is attached to the nickel metal nanostructure through chemical bonds, the maximum fluorescence excitation wavelength of the fluorescent metal nanocluster is 380 nm, the maximum emission wavelength of the fluorescent metal nanocluster is 445 nm, and the fluorescent metal nanocluster has optical property of aggregation-induced fluorescence enhancement in a solvent. According to the invention, the preparation method of the fluorescent metal nanocluster is simple, convenient, easy to operate, low in cost, green and mild; and the fluorescent metal nanocluster can be used as a fluorescent probe to be subjected to fluorescence quenching by DTC organic compounds, so that the fluorescent metal nanocluster can be used for quickly, sensitively and highly specifically recognizing the DTC organic compounds, and has potential application value in detection of environmental water samples and pesticide residue pollutants in traditional Chinese medicinal materials.

Description

technical field [0001] The invention relates to the technical fields of environmental detection and nanomaterials, in particular to a fluorescent metal nanocluster and its preparation method and application. Background technique [0002] Dithiocarbamate (DTC) is a class of organic compounds that can be used as fungicides and is widely used in agricultural production, especially against fungi and insects. Representative DTC pesticides include thiram, ferbam, ziram, prosenb, and thiram, etc. These pesticides have the advantages of low price and low toxicity, but they still need to strictly control the amount and method of use. Such pesticides can remain in crops, the atmosphere, soil, and water sources for a long time, and a little carelessness will cause irreversible damage to the human body and the ecological environment for a long time. Humans can absorb DTC residues through skin contact, lung breathing and gastrointestinal absorption, which can cause liver toxicity, immun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/60C09K11/02G01N21/64B82Y30/00
CPCC09K11/60C09K11/025B82Y30/00G01N21/6428G01N2021/6432
Inventor 李鹏程泽华魏金超
Owner UNIVERSITY OF MACAU
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