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Branch-like Ag nanostructure, modified electrode and preparation method and application thereof

A technology of nanostructured and modified electrodes, applied in the fields of electrochemical variables of materials, material analysis by electromagnetic means, instruments, etc., can solve the problems of poor stability and regeneration, inactivation of enzymes, and narrow application range, and reduce overpotentials. , high sensitivity and good selectivity

Active Publication Date: 2019-09-17
CITY COLLEGE OF DONGGUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the enzyme is easily inactivated by various external factors, the enzyme electrochemical biosensor has poor stability and reproducibility when detecting the concentration of hydrogen peroxide, and its application range is narrow.

Method used

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  • Branch-like Ag nanostructure, modified electrode and preparation method and application thereof
  • Branch-like Ag nanostructure, modified electrode and preparation method and application thereof
  • Branch-like Ag nanostructure, modified electrode and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Step A1. Dissolve 1.0 g of polyvinylpyrrolidone and 0.0922 g of sodium tellurite in 35 mL of deionized aqueous solution, and stir for 20 min to form a mixed solution;

[0055] Step A2, adding 1.65mL of hydrazine hydrate and 3.35mL of ammonia water to the mixed solution in step A1, and continued to stir for 20min to form a mixed solution;

[0056] Step A3. Transfer the solution obtained in step A2 to a polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 180°C for 4 hours. After the reaction is completed, take it out and cool it to room temperature, open the lid of the reactor, and add 110mL of acetone, let it stand for 20min, then centrifuge, wash the centrifuged precipitate twice with ethanol and deionized water with a mass ratio of 1:1, and dry at 60°C to obtain Te nanowires;

[0057] Synthesis of step B, branch-like Ag nanostructure

[0058] Step B1, taking a certain amount of copper chloride and ethylene glycol respectively, adding copper chlorid...

Embodiment 2

[0064] Step A1. Dissolve 0.5 g of polyvinylpyrrolidone and 0.01 g of sodium tellurite in 15 mL of deionized aqueous solution, and stir for 10 min to form a mixed solution;

[0065] Step A2, add 0.1mL hydrazine hydrate and 0.5mL ammonia water to the mixed solution in step A1, and continue stirring for 10min to form a mixed solution;

[0066] Step A3. Transfer the solution obtained in step A2 to a polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 120°C for 0.5 hours. After the reaction is completed, take it out and cool it to room temperature, open the lid of the reactor, and add 80mL of acetone, let it stand for 10min, then centrifuge, wash the centrifuged precipitate twice with ethanol and deionized water with a mass ratio of 1:1, and dry at 50°C to obtain Te nanowires;

[0067] Synthesis of step B, branch-like Ag nanostructure

[0068] Step B1, taking a certain amount of copper chloride and ethylene glycol respectively, adding copper chloride to ethylen...

Embodiment 3

[0074] Step A1. Dissolve 2.0 g of polyvinylpyrrolidone and 0.2 g of sodium tellurite in 60 mL of deionized aqueous solution, and stir for 30 min to form a mixed solution;

[0075] Step A2: Add 5.0 mL of hydrazine hydrate and 8 mL of ammonia water to the mixed solution in step A1, and continue stirring for 30 minutes to form a mixed solution;

[0076] Step A3. Transfer the solution obtained in step A2 to a polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 220°C for 3 hours. After the reaction is completed, take it out and cool it to room temperature, open the lid of the reactor, and add 150mL of acetone, let it stand for 30min, then centrifuge, wash the centrifuged precipitate twice with ethanol and deionized water with a mass ratio of 1:1, and dry at 80°C to obtain Te nanowires;

[0077] Synthesis of step B, branch-like Ag nanostructure

[0078] Step B1, take a certain amount of copper chloride and ethylene glycol respectively, add copper chloride in eth...

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Abstract

The present invention relates to a branched Ag nanostructure, a modified electrode, a preparation method therefor, and an application thereof. The branched Ag nanostructure is synthesized by a hydrothermal method and a microwave method: Te nanowires are synthesized by a hydrothermal method, and the Te nanowires are then used as a template to generate the branched Ag nanostructure by means of a substitution reaction under microwave heating conditions. An electrode modified by the branched Ag nanostructure is used as a working electrode to prepare an H2O2 enzyme-free sensor. Electrochemical data showed that the branched Ag nanostructure can accelerate the transfer of electrons on the surface of H2O2 and the electrode, and reduce overpotentials during electrochemical oxidation. There exists a linear relationship between oxidation peak currents and concentrations (R = 0.998) in the concentration range of H2O2 of 0.05 μM to 1.925 mM. The limit of detection is 0.013 μM. Furthermore, the synthesized electrochemical sensor has good stability and repeatability, and the obtained sensor provides a new method for actual analysis and detection of H2O2.

Description

technical field [0001] The invention relates to the technical field of electrochemical biosensors, in particular to a branch-shaped Ag nanostructure, a modified electrode, and a preparation method and application thereof. Background technique [0002] The chemical formula of hydrogen peroxide is H 2 o 2 , commonly known as hydrogen peroxide. Appearance is colorless transparent liquid, is a strong oxidant, its aqueous solution is suitable for medical wound disinfection, environmental disinfection and food disinfection. Under normal circumstances, it will be decomposed into water and oxygen, but the decomposition rate is extremely slow. The way to speed up its reaction rate is to add a catalyst - manganese dioxide or irradiate with short-wave rays. [0003] The use of hydrogen peroxide is divided into three types: medical, military and industrial. Daily disinfection is medical hydrogen peroxide. Medical hydrogen peroxide can kill intestinal pathogenic bacteria, pyogenic coc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/327G01N27/48
Inventor 张燕陈妹琼程发良钟娟何俊毅吕宛蔚张裕铭胡炜棠许琰婷梁瑞芳
Owner CITY COLLEGE OF DONGGUAN UNIV OF TECH