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Preparation method, product and application of CuS/GO/MWCNTs composite nanoparticle modified electrode

A technology of composite nanoparticles and modified electrodes, which is applied in the field of electrochemical analysis and detection, can solve the problems of detection limited by pH value, poor stability, insufficient sensitivity, etc., and achieve easy operation, easy practical application, stability and repeatability Good results

Active Publication Date: 2018-11-06
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] While the current detection H 2 o 2 Most of the biosensing needs to use enzymes as substrates for determination, and the sensitivity is still insufficient. The detection is limited by the pH value and the stability is not good. Detecting hydrogen peroxide is a technical problem to be solved in this area

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  • Preparation method, product and application of CuS/GO/MWCNTs composite nanoparticle modified electrode
  • Preparation method, product and application of CuS/GO/MWCNTs composite nanoparticle modified electrode
  • Preparation method, product and application of CuS/GO/MWCNTs composite nanoparticle modified electrode

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Experimental program
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Embodiment 1

[0035] Preparation of CuS / GO / MWCNTs composites:

[0036] Unprocessed multi-walled carbon nanotubes were mixed with H at a volume ratio of 3:1 2 SO 4 / HNO 3 The mixed solution was activated at 80° C. for 3 h, diluted with deionized water and filtered, and the obtained solid was washed with deionized water to remove excess mixed acid. Finally, dry at 85°C for 1 hour;

[0037] Weigh 20 mg of activated multi-walled carbon nanotubes and dissolve them in 10 mL of deionized water, add 400 μL of graphene oxide sol, and ultrasonically disperse to obtain a uniform solution. Add 4mg CuNO sequentially 3 ·3H2 0. 20 mg polyvinylpyrrolidone and 4 mg thiourea, stirred for at least half an hour;

[0038] Transfer the mixture to a 25mL autoclave lined with polytetrafluoroethylene, keep at 160°C for 5h, and cool at room temperature;

[0039] The obtained product was centrifuged and washed several times with distilled water and absolute ethanol, respectively, and dried under vacuum at 60°C ...

Embodiment 2

[0049] Hydrogen peroxide electrochemical test:

[0050] The prepared modified electrode is used for the electrochemical detection of hydrogen peroxide, the method is as follows: add 200mL KOH (0.1M) in the electrolytic cell as the electrolyte solution, pass nitrogen gas into it for 10-20min to eliminate the dissolved oxygen therein, and keep the experiment in a nitrogen atmosphere Down. A three-electrode system was adopted, using a modified electrode as the working electrode, a platinum wire as the counter electrode, and an Ag / AgCl electrode as the reference electrode. Put the electrode into the electrolytic cell, connect to the electrochemical workstation, select cyclic voltammetry, the scanning window is -0.8 ~ 0.4V, first scan 6 ~ 10 circles in the blank solution until the electrode is stable. Continuously add an appropriate amount of hydrogen peroxide to make it a solution containing different concentrations of hydrogen peroxide, record and scan the corresponding peak cur...

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Abstract

The invention discloses a preparation method, a product and application of a CuS / GO / MWCNTs composite nanoparticle modified electrode. The method includes the steps that a multi-wall carbon nanotube isactivated, wherein the multi-wall carbon nanotube is activated in an H2SO4 / HNO3 mixed solution, diluted, filtered and dried; a CuS / GO / MWCNTs composite material is prepared, wherein the activated multi-wall carbon nanotube is weighed and dissolved in water, graphene oxide colloidal sol is added, a uniform solution is obtained through ultrasonic dispersion, copper nitrate, polyvinylpyrrolidone andthiourea are added, stirring is performed, heating is performed for a reaction, after the reaction is ended, cooling, rinsing and drying are performed, and the CuS / GO / MWCNTs composite material is obtained. With the CuS / GO / MWCNTs composite nanoparticle modified electrode, the effect of detecting hydrogen peroxide is quite good, the threshold of detection is 0.6 microns, the linear detection range is 0.45-60 millimeters, the application potential is lower than 0.31 V, and the detection sensitivity is up to 386 microamperes / {millimeter*centimeter <2>}.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis and detection, and in particular relates to a preparation method of a CuS / GO / MWCNTs composite nanoparticle modified electrode and its product and application. Background technique [0002] Hydrogen peroxide (H 2 o 2 ) is an important chemical product that is essential in chemical, pharmaceutical, clinical, environmental and many other fields. Due to the important role of hydrogen peroxide in various fields such as food industry, fuel cell, chemical synthesis, biotechnology, environment, clinical and pharmaceutical applications, in recent years H 2 o 2 detection has received more and more attention. Currently, H 2 o 2 Detection methods include titration, chemiluminescence, fluorescence and electrochemical methods. [0003] While the current detection H 2 o 2 Most of the biosensing needs to use enzymes as substrates for determination, and the sensitivity is still insufficie...

Claims

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Application Information

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IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 金伟付艳秋胡美清
Owner JIANGNAN UNIV
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