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Nitrogen-doped graphene composite material supported by ag-cus core-shell microspheres, preparation method and application thereof

A technology of nitrogen-doped graphene and composite materials, which is applied to the analysis of materials, electrochemical variables of materials, and material analysis through electromagnetic means, and can solve problems such as low detection limits, high detection limits, and narrow detection ranges. Achieve the effects of low detection limit, wide detection range, detection range and detection limit improvement

Active Publication Date: 2022-07-08
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The primary technical problem to be solved by the present invention is to provide an Ag-CuS core-shell microsphere loaded The preparation method of the nitrogen-doped graphene composite material; the modified electrode prepared by the material has a wide detection range and an extremely low detection limit for the detection of tyrosine

Method used

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  • Nitrogen-doped graphene composite material supported by ag-cus core-shell microspheres, preparation method and application thereof
  • Nitrogen-doped graphene composite material supported by ag-cus core-shell microspheres, preparation method and application thereof
  • Nitrogen-doped graphene composite material supported by ag-cus core-shell microspheres, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A

[0039] Example 1 Preparation of Nitrogen-Doped Graphene Composites Supported by Ag-CuS Core-Shell Microspheres

[0040] (1) Synthesis of CuS microspheres: Weigh 0.4 mmol of cupric chloride dihydrate and 1 mmol of thiourea into a small beaker, add 7.5 mL of deionized water and 7.5 mL of N,N-dimethylformamide, stir magnetically for 45 min, The mixed solution was transferred to a polytetrafluoroethylene-lined hydrothermal reactor, and the reactor was placed in an oven at 170°C for constant temperature reaction for 6 hours. After the reaction was completed, it was naturally cooled to room temperature. Deionized water was washed three times to obtain CuS microspheres;

[0041] (2) Preparation of CuS microsphere dispersion: Disperse the obtained CuS microspheres in 5 mL of water, and add 0.75 g of glucose under vigorous stirring to obtain a CuS microsphere dispersion;

[0042] (3) Preparation of silver ammonia solution: 0.1g AgNO 3 Dissolve in 1 mL of water, slowly add 0.55 mol / L ...

Embodiment 1

[0049] The morphology and optical characteristics of the Ag-CuS core-shell microsphere-supported nitrogen-doped graphene composite prepared in Example 1 are as follows: figure 1 SEM images of nitrogen-doped graphene (A), nitrogen-doped graphene composites supported by CuS microspheres (B), and nitrogen-doped graphene composites supported by Ag-CuS core-shell microspheres (C); And the UV spectra of nitrogen-doped graphene composites supported by CuS microspheres and nitrogen-doped graphene composites supported by Ag-CuS core-shell microspheres (D). from figure 1 (A) It can be seen that the surface with nitrogen-doped graphene has more obvious wrinkles, which are caused by nitrogen doping, and this multi-wrinkled surface is beneficial to its loaded metal particles. from figure 1 (B) It can be seen that the CuS microspheres are supported on the surface of nitrogen-doped graphene. The CuS microspheres are constructed from nanosheets, and the overall appearance of the microsphere...

Embodiment 2A

[0051] Example 2 Preparation of Nitrogen-Doped Graphene Composite Modified Electrode Supported by Ag-CuS Core-Shell Microspheres

[0052] Utilize 0.3 μm and 0.05 μm Al 2 O 3 Polish the glassy carbon electrode (diameter 3mm) on sandpaper to a smooth mirror surface, then ultrasonically clean the glassy carbon electrode with 1:1 dilute nitric acid, acetone and distilled water for 5 minutes, and then bake it under infrared light until it is ready for use. Good glassy carbon electrode. Then, 1 mg of the nitrogen-doped graphene composite material supported by Ag-CuS core-shell microspheres prepared in Example 1 was added to 3 mL of N,N-dimethylformamide, and after ultrasonic dispersion for 10 min, the Ag-CuS core-shell was obtained The dispersion liquid of the nitrogen-doped graphene composite material supported by the microspheres was added dropwise on the surface of the treated glassy carbon electrode with 7 μL of the dispersion liquid, and dried under the irradiation of an infr...

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Abstract

The invention discloses a nitrogen-doped graphene composite material supported by Ag-CuS core-shell microspheres and a preparation method and application thereof. The preparation method of the composite material comprises the following steps: adding copper chloride dihydrate and thiourea into a mixed solution of deionized water and N-N-dimethylformamide, and reacting in a reactor after magnetic stirring, that is, Obtain CuS microspheres; disperse the CuS microspheres in deionized water, add glucose under stirring to obtain a CuS dispersion; add the prepared silver ammonia solution to the CuS dispersion, stir and stand, separate and wash the product to obtain Ag-CuS core-shell microspheres; take Ag-CuS core-shell microspheres and add them to N,N-dimethylformamide-dispersed nitrogen-doped graphene to obtain nitrogen-doped graphite supported by Ag-CuS core-shell microspheres vinyl composites. The chemically modified electrode prepared from the nitrogen-doped graphene composite material supported by the Ag-CuS core-shell microspheres of the present invention can be used for the rapid detection of tyrosine in food, and has the advantages of low detection limit, good stability, and easy operation. convenience and so on.

Description

technical field [0001] The invention relates to the technical field of material preparation and electrochemical detection, in particular to a nitrogen-doped graphene composite material supported by Ag-CuS core-shell microspheres and a preparation method and application thereof. Background technique [0002] Tyrosine is an important nutritional amino acid, which plays an important role in the metabolism, growth and development of humans and other animals, and is widely used in food, feed, medicine and chemical industries. Abnormal tyrosine content is directly related to certain diseases in the human body. For example, high content of tyrosine can cause dementia and Parkinson's disease, while the lack of tyrosine can lead to hypochondriasis, depression, albinism, alkaluria and other symptoms . Therefore, it is of great practical significance and scientific value to establish a simple, rapid, economical and accurate method for the determination of tyrosine. At present, the me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
CPCG01N27/308Y02E60/50
Inventor 李俊华游汝芝唐斯萍许志锋刘梦琴贺灵芝
Owner HENGYANG NORMAL UNIV
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