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Red fluorescent gold/copper nanocluster alloy as well as preparation method and application thereof

A technology of red fluorescence and copper nanometers, applied in fluorescence/phosphorescence, chemical instruments and methods, luminescent materials, etc., can solve the problems of poor luminescence performance, cumbersome synthesis process, and high cost, and achieve widely available raw materials and good water solubility , low-cost effect

Inactive Publication Date: 2015-12-30
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods reported in these literatures are good, but there are also some shortcomings, such as: the synthesis process is a bit cumbersome, the cost is high, the luminescence performance is not good, the single peak shape, etc.

Method used

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  • Red fluorescent gold/copper nanocluster alloy as well as preparation method and application thereof
  • Red fluorescent gold/copper nanocluster alloy as well as preparation method and application thereof
  • Red fluorescent gold/copper nanocluster alloy as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of red fluorescent gold / copper nanocluster alloy using egg white as template:

[0039] (1) Add 0.50g of egg white powder into 10mL of deionized water, and ultrasonically dissolve to prepare a mixed solution;

[0040] (2) Pipette 2.0mL (50mg / mL) of the mixed solution obtained in step (1) into 2.0mL10mmol / L of chloroauric acid solution, and stir to fully mix the two;

[0041] (3) Add 0.2mL of 1mol / L sodium hydroxide solution to the mixed solution obtained in step (2) to adjust the pH value of the solution to 11-12; then, stir at 55°C for 2min;

[0042] (4) Add 1.0mL3mmol / L copper nitrate solution to the mixed solution obtained in step (3), and stir for 2min at 55°C; then add 10 μL 1mol / L sodium hydroxide solution, and the solution becomes pale yellow; after that, Continue to stir and react at 55°C for 12h;

[0043] (5) Centrifuge the product obtained in step (4), centrifuge at a speed of 13000r / min for 10min, dialyze for 12h with a dialysis bag with a molecu...

Embodiment 2

[0048] Experiment of the influence of pH value on the fluorescent peak intensity of the red fluorescent gold / copper nanocluster alloy solution prepared in Example 1:

[0049] Add 0.1mL of the red fluorescent gold / copper nanocluster alloy solution prepared in Example 1 to 0.9mL of phosphate buffer solution with different pH values, fix the excitation wavelength at 380nm, and perform fluorescence spectrum detection at room temperature. According to 474.0nm, The change of the fluorescence peak intensity around 623.0nm was used as the ratio of the fluorescence intensity of the two peaks to detect the influence of the pH value on the red fluorescent gold / copper nanocluster alloy solution.

[0050] Effect of pH value on fluorescence peak intensity of red fluorescent gold / copper nanocluster alloy solution (F 623.0 / 474.0 ) see image 3 : Under 380nm excitation, the red fluorescent gold / copper nanocluster alloy solution is in the scope of pH 4.0-13.0, fluorescence peak intensity (F 6...

Embodiment 3

[0052] Experiment of the influence of ionic strength on the fluorescence peak intensity of the red fluorescent gold / copper nanocluster alloy solution prepared in Example 1:

[0053] Add 0.1 mL of the red fluorescent gold / copper nanocluster alloy solution prepared in Example 1 to 0.9 mL of phosphate buffer solution (pH=7.0), fix the excitation wavelength at 380 nm, and add sodium chloride solutions of different concentrations (0 to 7.0). 75mmol / L), carry out fluorescence spectrum detection at room temperature, according to the fluorescence peak intensity change of 474.0nm, 623.0nm left and right sides, make the fluorescence intensity ratio of two peaks, detect ion intensity to red fluorescent gold / copper nanocluster alloy solution influences.

[0054] Effect of ionic strength on the fluorescence peak intensity of the red fluorescent gold / copper nanocluster alloy solution (F 623.0 / 474.0 ) see Figure 4 : Under 380nm excitation, the red fluorescent gold / copper nanocluster alloy...

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Abstract

The invention provides a red fluorescent gold / copper nanocluster alloy as well as a preparation method and an application thereof. Egg white is taken as a template and a stabilizer, and the red fluorescent gold / copper nanocluster alloy with uniform size dimension and good stability is prepared from gold / copper in certain mole ratio with a one-pot method. The method is simple to operate, and the raw materials are widely sourced and easy to obtain and has good repeatability; besides, the prepared red fluorescent gold / copper nanocluster alloy has good water solubility and high fluorescent stability, adopts a double-peak structure and can be used for detection of silver ions in a water system, biological cell imaging and the like.

Description

technical field [0001] The invention relates to the technical field of fluorescent nanomaterials, in particular to a red fluorescent gold / copper nano-cluster alloy and a preparation method thereof, as well as the application of the nano-cluster alloy in the detection of silver ions. Background technique [0002] Metal nanoclusters are ultra-small nanoparticles with a size less than 2nm. As a new type of fluorescent luminophore, it has attracted the interest of extensive researchers as a fluorescent probe with good performance due to its advantages of low preparation cost, easy surface modification, good water solubility, and excellent optical properties. It has also become an important part of nanomaterials and is widely used in chemical analysis, bioimaging, biosensing, catalysis and other research fields. [0003] At present, most of the synthesis is gold, silver and copper nanoclusters, while the preparation and application of metal nanocluster alloys are less, which wil...

Claims

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Application Information

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IPC IPC(8): C09K11/58G01N21/64
Inventor 张国梅乔云云张彩红张彦双少敏
Owner SHANXI UNIV
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