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Copper-silver-loaded few-layer graphene-based composite material as well as preparation method and application thereof

A few-layer graphene and composite material technology, applied in the analysis of materials, material electrochemical variables, material analysis through electromagnetic means, etc., can solve the complex preparation process, affect the sensing performance of composite materials, and the distribution position and size of metal particles Inhomogeneity and other problems, to achieve the effect of simple preparation process, excellent sensing performance and good catalytic performance

Pending Publication Date: 2022-05-24
GUANGDONG PHARMA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the existing research uses graphene oxide prepared by the Hummers method as the carbon substrate to prepare metal nanoparticle composite materials. The preparation process is complicated, and the distribution position and size of the metal particles are not uniform, which affects the sensing performance of the composite material.

Method used

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  • Copper-silver-loaded few-layer graphene-based composite material as well as preparation method and application thereof
  • Copper-silver-loaded few-layer graphene-based composite material as well as preparation method and application thereof
  • Copper-silver-loaded few-layer graphene-based composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The few-layer graphene-based composite Cu was prepared according to the following steps x O / Ag@FLG:

[0041] Using 0.4g graphite powder, 5ml absolute ethanol, 30ml cyclohexane, 0.15g anhydrous copper sulfate, 3g Tween 80, 4g Span 80, 0.2g PVP, 5ml deionized water as raw materials, it was prepared by vortex mixing. Homogeneous and stable graphite oil water-in-water emulsion, then frozen at -18°C for 2h, and then sonicated for 2h; then added sodium borohydride 0.057g, and repeated freezing and ultrasonication for 2h each; then added 2ml of 2% PVP aqueous solution containing 0.15g of silver nitrate , refrigerated and ultrasonicated again for 2 h each, that is, the few-layer graphene-based composite Cu was synthesized. x O / Ag@FLG.

[0042] like figure 1 As shown in the SEM image of , partially aggregated spherical AgO nanoparticles and flower-like Cu nanoparticles are supported on the surface of few-layer graphene; figure 2 The EDX spectrum of the composite material sh...

Embodiment 2

[0044] Perform the hydrogen peroxide test as follows:

[0045] The few-layer graphene-based composite material Cu prepared in Example 1 x O / Ag@FLG was dispersed in 0.5 wt% Nafion ethanol solution to obtain 1 mg / mL catalyst ink; then, 5 μL of catalyst ink was dropped on the pretreated glassy carbon electrode and dried under infrared lamp for 15 min to obtain Cu x O / Ag@FLG modified glassy carbon electrode, the electrolyte solution is phosphate buffer solution with pH=7.4, the selective potential is -0.65V, and cyclic voltammetry is used for detection in the solution to be tested.

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Abstract

The invention discloses a preparation method of a copper-silver-loaded few-layer graphene-based composite material, which comprises the following steps: S1, taking graphite powder, absolute ethyl alcohol, cyclohexane, anhydrous cupric sulfate, Tween 80, span 80, PVP and deionized water as raw materials, and uniformly mixing through vortex to prepare a uniform and stable graphite water-in-oil emulsion; s2, performing low-temperature freezing on the graphite water-in-oil emulsion prepared in the step S1 for 2 hours, and then performing ultrasonic treatment for 2 hours; s3, sodium borohydride is added into the graphite water-in-oil emulsion treated in the step S2, then low-temperature freezing is conducted for 2 h, and then ultrasonic treatment is conducted for 2 h; and S4, adding a 2% PVP aqueous solution containing silver nitrate into the graphite water-in-oil emulsion treated in the step S3, performing low-temperature freezing for 2 hours, and performing ultrasonic treatment for 2 hours to obtain the few-layer graphene-based composite material CuxO / Ag-coated FLG. The preparation method is simple in synthesis process and high in yield. The hydrogen peroxide sensor prepared from the few-layer graphene-based composite material CuxO / Ag-coated FLG is excellent in sensing performance.

Description

technical field [0001] The invention belongs to the field of hydrogen peroxide detection, and in particular relates to a copper-silver-loaded few-layer graphene-based composite material, a preparation method thereof, and its application in hydrogen peroxide detection. Background technique [0002] Hydrogen peroxide is one of the by-products of many classical enzyme-catalyzed reactions, such as glucose oxidation, uric acid oxidation, oxalic acid oxidation, amino acid oxidation, glutamic acid, lysine oxidation, etc. These processes are related to human health. Therefore, in a sense, the relevant physiological indicators of the human body can be monitored by detecting the content of hydrogen peroxide. At the same time, the content of hydrogen peroxide in the body is often considered to be an important indicator of related diseases such as Parkinson's, cancer, stroke, and arteriosclerosis. [0003] Hydrogen peroxide is an important signaling molecule (ROS), because it can direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30
CPCG01N27/48G01N27/308
Inventor 严志红刘意宋杰刘威杨海彬梁筱玥杨晨
Owner GUANGDONG PHARMA UNIV
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