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Preparation method and application of ZnFe2O4 modified electrode material

A technology for modifying electrodes and znfe2o4, which can be used in electrochemical sensors and non-enzymatic glucose detection fields, and can solve problems such as insufficient long-term stability

Active Publication Date: 2020-06-30
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the aforementioned enzyme-based glucose sensors have been explored and improved to provide high sensitivity and selectivity, their most common and serious problem is insufficient long-term stability due to the nature of the enzyme

Method used

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  • Preparation method and application of ZnFe2O4 modified electrode material
  • Preparation method and application of ZnFe2O4 modified electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] ZnFe 2 o 4 Preparation of nanoparticles:

[0023] a, Fe:Zn=2:1 is weighed ferric nitrate and zinc acetate by atomic molar ratio, is dissolved in deionized water, stirs evenly, is mixed with concentration and is 0.1mol / L metal salt mixed solution;

[0024] B, again press sodium hydroxide and metal ion molar ratio 1.4:1, be mixed with concentration and be 1mol / L sodium hydroxide solution;

[0025] c. Add the metal salt mixed solution obtained in step a dropwise to the sodium hydroxide solution obtained in step b, stir magnetically for 5 hours at room temperature to obtain the mixture, age for 12 hours, and then centrifuge the aged mixed solution to obtain ZnFe 2 o 4 Hydroxide mixed precipitation;

[0026] D, get the ZnFe that step c obtains 2 o 4 The mass of hydroxide mixed precipitate is 2.0g, dispersed in the mixed solution of deionized water and ethanol containing polyvinylpyrrolidone, and placed in a 100ml polytetrafluoroethylene liner, the hydrothermal temperat...

Embodiment 2

[0034] ZnFe 2 o 4 Preparation of nanoparticles:

[0035] a, Fe:Zn=2:1 is weighed ferric nitrate and zinc acetate by atomic molar ratio, is dissolved in deionized water, stirs evenly, is mixed with concentration and is 0.1mol / L metal salt mixed solution;

[0036] B, then by sodium hydroxide and metal ion molar ratio 1.2:1, be prepared into concentration and be 0.1mol / L sodium hydroxide solution;

[0037] c. Add the metal salt mixed solution obtained in step a dropwise to the sodium hydroxide solution obtained in step b, stir magnetically at room temperature for 4 h to obtain the mixture, age for 24 h, and then centrifuge the aged mixed solution to obtain ZnFe 2 o 4 Hydroxide mixed precipitation;

[0038] D, get the ZnFe that step c obtains 2 o 4 The mass of hydroxide mixed precipitate is 1.0g, dispersed in the mixed solution of deionized water and ethanol containing polyvinylpyrrolidone, and placed in a 100ml polytetrafluoroethylene liner, the hydrothermal temperature is ...

Embodiment 3

[0047] ZnFe 2 o 4 Preparation of nanoparticles:

[0048] a, Fe:Zn=2:1 is weighed ferric nitrate and zinc acetate by atomic molar ratio, is dissolved in deionized water, stirs evenly, is mixed with concentration and is 1.5mol / L metal salt mixed solution;

[0049] B, again press sodium hydroxide and metal ion molar ratio 1.6:1, be mixed with concentration and be 1.5mol / L sodium hydroxide solution;

[0050] c. Add the metal salt mixed solution obtained in step a dropwise to the sodium hydroxide solution obtained in step b, stir magnetically for 6 hours at room temperature to obtain the mixture, age for 16 hours, and then centrifuge the aged mixed solution to obtain ZnFe 2 o 4 Hydroxide mixed precipitation;

[0051] D, get the ZnFe that step c obtains 2 o 4 The mass of hydroxide mixed precipitate is 3.0g, dispersed in the mixed solution of deionized water and ethanol containing polyvinylpyrrolidone, and placed in a 100ml polytetrafluoroethylene liner, the hydrothermal temper...

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Abstract

The invention relates to a preparation method and an application of a ZnFe2O4 modified electrode material. The method comprises the following steps: synthesizing ZnFe2O4 nanoparticles by a one-step hydrothermal process from bottom to top, and loading the ZnFe2O4 nanoparticles on foamed nickel to obtain the ZnFe2O4 / foamed nickel modified electrode material. The ZnFe2O4 / foamed nickel modified electrode material is applied to an enzyme-free electrochemical glucose sensor as an electrode. The method is simple and easy to operate; the material can be directly used for rapid electrochemical determination of enzyme-free glucose; compared with similar sensors, the glucose sensor has the following advantages: the detection sensitivity can reach 1160 [mu]A / mMcm<2>, the lowest detection limit reaches0.3 [mu]M, the detection range reaches 10 [mu]M to 100 mM, the current response is high, the stability is good, and the glucose detection efficiency and accuracy can be improved. When the sensor is applied to glucose detection, the sensitivity of glucose detection can be effectively improved, the linear interval of glucose detection is widened, and a relatively low detection limit can be realized.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to the field of enzyme-free glucose detection, specifically ZnFe 2 o 4 Preparation method and application of modified electrode material. Background technique [0002] Diabetes is a worldwide public health problem. This metabolic disorder is caused by insulin deficiency and hyperglycemia, manifested by blood glucose concentrations above or below the normal range of 80–120 mg dL -1 . Therefore, the development of high-performance glucose detection sensing devices is of great significance for the diagnosis and management of diabetes. Much of this research has involved the use of glucose oxidase, which catalyzes the oxidation of glucose to gluconolactone. Although the aforementioned enzyme-based glucose sensors have been explored and improved to provide high sensitivity and selectivity, their most common and serious problem is insufficient long-term stability due t...

Claims

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Application Information

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IPC IPC(8): G01N27/327
CPCG01N27/3278
Inventor 陈龙范长春邵培源郭旭虹廖延顺李昊泉江蓉
Owner SHIHEZI UNIVERSITY
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