Preparation and application of red fluorescent silver nanocluster

A technology of silver nanoclusters and red fluorescence, which is applied in the field of preparation of fluorescent nanomaterials, can solve the problems of high cost, silver nanocluster biological detection interference, cumbersome synthesis process, etc., and achieve low cost, strong photostability, and raw materials wide range of effects

Inactive Publication Date: 2015-11-11
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are good, however, the synthesis process is a bit cumbersome, the cost is hi...

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  • Preparation and application of red fluorescent silver nanocluster
  • Preparation and application of red fluorescent silver nanocluster
  • Preparation and application of red fluorescent silver nanocluster

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of red fluorescent silver nanoclusters using egg white as template:

[0039] (1) Add 0.25g of egg white powder into 10mL of deionized water, and ultrasonically dissolve to prepare a mixed solution;

[0040] (2) Add the mixed solution obtained in step (1) to 0.5mL0.1molL -1 Silver nitrate solution, stirring to fully mix the two;

[0041] (3) Add 0.3mL1molL to the mixed solution obtained in step (2) -1 Sodium hydroxide solution, stirred at room temperature for 0.5h;

[0042] (4) Add 30 μL of 11.2 mmolL to the mixed solution obtained in step (3) -1 Sodium borohydride solution, the solution changed from colorless to dark brown, and continued stirring and reacting at room temperature for 1h;

[0043] (5) The product obtained in step (4) is centrifuged with 4000rmin -1 Centrifuge at a rotating speed for 10 minutes, and dialyze for 2 hours with a dialysis bag with a molecular weight cut-off of 1000 Da during dialysis, and finally obtain a red fluorescent silve...

Embodiment 2

[0048] Experiment of the influence of metal ions on the fluorescence peak intensity of the red fluorescent silver nanocluster solution prepared in Example 1:

[0049] Use 0.01mol·L of pH=7 -1 phosphate buffer and Pb(NO 3 ) 2 , Mg(NO 3 ) 2 , Mn(NO 3 ) 2 , Fe(NO 3 ) 3 , Zn(NO 3 ) 2 , Cd(NO 3 ) 2 , Cu(NO 3 ) 2 , Hg(NO 3 ) 2 , K(NO 3 ) 2 , Ca(NO 3 ) 2 、NaNO 3 , Ni(NO 3 ) 2 , AgNO 3 , Bi(NO 3 ) 2 , Co(NO 3 ) 2 Prepare the metal ion concentration to be 100 μmol L -1 solution, 0.5mL of the red fluorescent silver nanocluster solution prepared in Example 1 was added to 0.5mL of the above-mentioned solution containing different metal ions, the excitation wavelength was fixed at 503nm, and the fluorescence spectrum was detected at room temperature. Fluorescence peak intensity, detecting the influence of metal ions on the fluorescence peak intensity of red fluorescent silver nanocluster solution. In addition, the above solution was placed under a fluorescent l...

Embodiment 3

[0053] Experiment of the influence of pH value on the fluorescence peak intensity of the red fluorescent silver nanocluster solution prepared in Example 1:

[0054] Add 0.5mL of the red fluorescent silver nanocluster solution prepared in Example 1 to 0.5mL of phosphate buffer solution with different pH values, fix the excitation wavelength at 503nm, and perform fluorescence spectrum detection at room temperature. According to the fluorescence peak intensity at around 620nm , to detect the effect of pH value on the fluorescence peak intensity of red fluorescent silver nanocluster solution.

[0055] The effect of pH value on the fluorescence peak intensity of the red fluorescent silver nanocluster solution is shown in Figure 5 : Under the excitation of 503nm, the red fluorescent silver nanocluster solution is in the scope of pH 3-11, and the fluorescence peak intensity does not change much substantially, indicating that the red fluorescent silver nanocluster solution prepared b...

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Abstract

The invention provides a preparation method of a red fluorescent silver nanocluster. Egg white is taken as a template and a protective agent; sodium borohydride is taken as a reducing agent; and "one kettle way" is utilized to prepare the silver nanocluster with uniform size, good stability, and red fluorescence. The method is simple to operate, relatively low in cost, and excellent in repeatability, and the raw materials are widely available. The prepared red fluorescent silver nanocluster is good in water solubility and strong in stability, and is applicable for testing mercury ions in a water system.

Description

technical field [0001] The invention belongs to the technical field of preparation of fluorescent nanomaterials, in particular to the preparation and application of a red fluorescent silver nanocluster Background technique [0002] Silver nanoclusters are ultra-small nanoparticles with a metal core size less than 2nm. As a new type of fluorophore, it has the advantages of low preparation cost, active chemical properties, easy surface modification, and good water solubility. As a fluorescent probe with excellent performance, it has aroused extensive interest of researchers. Clusters have gradually become an important part of metal nanomaterials, and are widely used in chemical analysis, biosensing, bioimaging, catalysis and other research fields. [0003] Currently, most of the synthesized silver nanoclusters emit blue light when excited by ultraviolet light. In terms of analysis and detection and biology, red fluorescent silver nanoclusters are more attractive, so that the...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 张国梅乔云云张彩红张彦双少敏
Owner SHANXI UNIV
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