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A fluorescent copper nanocluster, its preparation method and its application

A nano-cluster and fluorescent copper technology, applied in the field of preparation and fluorescent copper nano-clusters, can solve the problems of poor water solubility and stability, and achieve the effects of good water solubility and stability, short reaction time and simple operation.

Active Publication Date: 2022-04-05
TAIYUAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although researchers have prepared CuNCs with different emission fluorescence by using various protective agents, stabilizers and reducing agents, their water solubility and stability are poor, and CuNCs with orange fluorescence have not been obtained so far.

Method used

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  • A fluorescent copper nanocluster, its preparation method and its application
  • A fluorescent copper nanocluster, its preparation method and its application
  • A fluorescent copper nanocluster, its preparation method and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] First take a clean 25.0mL colorimetric tube, then add 2.0mL copper chloride (CuCl 2 , 1.0mM), 6.0mL polyvinylpyrrolidone (PVP 0.069mM), 6.0mL 2-mercaptobenzothiazole (MBT, 0.1mM) and 4.0mL ascorbic acid (Vc, 0.1mM), and dilute to the mark with ultrapure water and mix Homogenize, then place in an ultrasonic cleaner to seal the reaction. The reaction parameters were set as: 20°C, 60W, 20min, 80Uwl. After the reaction was completed, the reaction solution was transferred to a 30KDa ultrafiltration tube and centrifuged at 4500rpm for purification. The orange fluorescent copper nanoclusters were prepared and stored in a refrigerator at 4°C in the dark for future use. Synthesis schematic as figure 1 shown. figure 2 In order to change the amount of PVP, MBT, VC, reaction temperature, time, power and pH when preparing copper nanoclusters to determine the best reaction conditions. Depend on figure 2 It can be seen that the orange copper nanocluster solutions prepared unde...

Embodiment 2

[0050] Example 2 Stability test of polyvinylpyrrolidone-coated fluorescent copper nanoclusters (PVP-CuNCs)

[0051] In order to explore the stability of the prepared PVP-CuNCs, the effects of time effect, ultraviolet radiation effect and salt effect on the fluorescence intensity were studied respectively. Specifically:

[0052] Time effect: Store the PVP-CuNCs prepared under the optimal conditions in Example 1 in a 5.0mL EP tube, store them in a refrigerator at 4°C in the dark, and measure their excitation wavelength at 340nm and emission wavelength is the fluorescence spectrum at 580nm.

[0053] Ultraviolet radiation effect: The PVP-CuNCs prepared in Example 1 were placed in 12 tubes of 5.0mL EP tubes for different times of ultraviolet irradiation, and then their fluorescence spectra were measured at 340nm excitation wavelength and 580nm emission wavelength.

[0054] Salt effect: Dilute 0.2mL of PVP-CuNCs prepared under the optimal conditions in Example 1 with 1.8mL (0.05M,...

Embodiment 3

[0056] Example 3 UV and fluorescence characterization of polyvinylpyrrolidone-coated fluorescent copper nanoclusters (PVP-CuNCs)

[0057] In order to confirm whether PVP-CuNCs were successfully prepared, the PVP-CuNCs prepared in Example 1, CuCl 2 , PVP, MBT and Vc solutions, and measure the corresponding ultraviolet spectrum and fluorescence spectrum in a quartz cuvette.

[0058] Figure 4 A shows the ultraviolet absorption spectrum of the PVP-CuNCs prepared in Example 1. It can be observed from the figure that there is an ultraviolet absorption peak around 350nm, while the raw material has no absorption peak here. Figure 4 In B, under the excitation of 340nm, each reaction material has no fluorescence emission peak at 580nm, but PVP-CuNCs has an emission peak, which is fully separated from the spectral region where endogenous fluorescence occurs. The inset is a picture taken of PVP-CuNCs and each reaction raw material mixture under a UV lamp (λmax=365nm). It can be seen t...

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Abstract

The invention discloses a fluorescent copper nano cluster, a preparation method and an application thereof, and belongs to the technical field of food detection. In the present invention, polyvinylpyrrolidone is used as a protective agent, copper salt is used as a metal precursor, 2-mercaptobenzothiazole is used as a stabilizer, ascorbic acid is used as a reducing agent, and water-soluble orange fluorescent copper nanoparticles with good stability are successfully prepared by sonochemical reduction. Clusters (CuNCs), the fluorescence intensity of the fluorescent copper nanoclusters has a good linear relationship with the ethanol concentration (5%-90%). The fluorescent copper nanocluster can detect the ethanol content in the alcoholic drink through the change of the fluorescence intensity, and can be applied to the ethanol detection test paper to visualize the ethanol detection. The method of the invention has the advantages of being green, time-saving, sensitive, non-toxic, etc., and has a wide range of copper sources, showing the application of the fluorescent copper nano-cluster in food safety detection.

Description

technical field [0001] The invention relates to the technical field of food detection, in particular to a fluorescent copper nanocluster, a preparation method and an application thereof. Background technique [0002] As an organic solvent, ethanol is widely used in the fields of medicine, biology, agriculture and food industry due to its good chemical reduction and reactivity, especially as a wine additive and traditional Chinese medicine dissolving agent. Although ethanol has a wide range of applications, excessive use of ethanol will still cause certain harm. For example, many unscrupulous businessmen often mix excessive amounts of ethanol in wine products in order to make huge profits, which leads to frequent occurrence of alcohol poisoning incidents among drinkers. Therefore, accurate quantitative detection of ethanol content is very important for environmental monitoring, clinical diagnosis, food testing and drinking water quality testing. [0003] The traditional det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/102B22F1/054B22F9/24C09K11/02C09K11/58G01N21/64B82Y20/00B82Y40/00
CPCB22F9/24C09K11/025C09K11/58G01N21/6428B82Y20/00B82Y40/00G01N2021/6432B22F1/102
Inventor 李林陈娟徐甜甜张彩凤
Owner TAIYUAN NORMAL UNIV
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