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Preparation method and application of organophosphorus pesticide sensor based on nickel nitride array

A technology of organophosphorus pesticides and nickel nitride, which is applied in the direction of instruments, scientific instruments, and electrochemical variables of materials, can solve the problems of reduced sensitivity, reduced stability and reproducibility of electrochemical sensors, and limited application of molecularly imprinted membranes. Achieve excellent electron transfer ability, convenient operation, and reduce detection cost

Inactive Publication Date: 2019-01-22
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process of traditional MIP-ECS, there are disadvantages such as difficult elution of template molecules, difficulty in controlling the thickness of imprinted membranes, and poor reproducibility, which limit the application of molecularly imprinted membranes in electrochemical sensors.
These problems, especially the difficult control of the thickness of the molecularly imprinted membrane, which leads to the decrease of the sensitivity of the electrochemical sensor, and the technical difficulties that the molecularly imprinted membrane is easily detached from the electrode surface during the elution process, resulting in a decrease in stability and reproducibility, limit the application of MIP_ECS. It is of great research significance and market value to find new synthesis methods for molecularly imprinted polymers, new methods for modifying molecularly imprinted membrane electrodes, and methods for combining molecularly imprinted membranes with substrate materials to solve the problems of preparation and application of MIP-ECS.

Method used

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  • Preparation method and application of organophosphorus pesticide sensor based on nickel nitride array
  • Preparation method and application of organophosphorus pesticide sensor based on nickel nitride array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 Preparation of NiN-nanoarray

[0031] (1) Use dilute hydrochloric acid, absolute ethanol and deionized disposable electrode for ultrasonic cleaning to remove the oxide layer and surface impurities of the disposable electrode;

[0032] (2) Weigh 1 mmol nickel nitrate hexahydrate Ni(NO 3 ) 2 ·6H 2 O and 3 mmol urea CO(NH 2 ) 2 , put it into a 50 mL beaker, add 30 mL of deionized water and stir until clear, then transfer to a 50 mL polytetrafluoroethylene reactor;

[0033] (3) Put the disposable disposable electrode treated in step (1) into the solution in the reaction kettle in step (2), and react at a temperature of 100°C for 12 hours to prepare the nickel hydroxide nanosheet array precursor body electrode;

[0034] (4) Insert the nickel hydroxide nanosheet array precursor electrode obtained in step (3) into ammonia water for 5 seconds, take it out, and heat it to 340°C for 8 hours in an ammonia environment, then continue to naturally Cool down to room t...

Embodiment 2

[0036] Example 2 Preparation of NiN-nanoarray

[0037] (1) Use dilute hydrochloric acid, absolute ethanol and deionized disposable electrode for ultrasonic cleaning to remove the oxide layer and surface impurities of the disposable electrode;

[0038] (2) Weigh 2 mmol nickel nitrate hexahydrate Ni(NO 3 ) 2 ·6H 2 O and 6 mmol urea CO(NH 2 ) 2 , put it into a 50 mL beaker, add 30 mL of deionized water and stir until clear, then transfer to a 50 mL polytetrafluoroethylene reactor;

[0039] (3) Put the disposable disposable electrode treated in step (1) into the solution in the reaction kettle in step (2), and react at a temperature of 110°C for 11 hours to prepare the nickel hydroxide nanosheet array precursor body electrode;

[0040] (4) Insert the nickel hydroxide nanosheet array precursor electrode obtained in step (3) into ammonia water for 15 seconds, take it out, and heat it to 370°C for 6 hours in an ammonia environment, then continue to naturally Cool down to room ...

Embodiment 3

[0042] Example 3 Preparation of NiN-nanoarray

[0043] (1) Use dilute hydrochloric acid, absolute ethanol and deionized disposable electrode for ultrasonic cleaning to remove the oxide layer and surface impurities of the disposable electrode;

[0044] (2) Weigh 3 mmol nickel nitrate hexahydrate Ni(NO 3 ) 2 ·6H 2 O and 9 mmol urea CO(NH 2 ) 2 , put it into a 50 mL beaker, add 30 mL of deionized water and stir until clear, then transfer to a 50 mL polytetrafluoroethylene reactor;

[0045] (3) Put the disposable disposable electrode treated in step (1) into the solution in the reaction kettle in step (2), and react at a temperature of 130°C for 9 hours to prepare the nickel hydroxide nanosheet array precursor body electrode;

[0046] (4) Insert the nickel hydroxide nanosheet array precursor electrode obtained in step (3) into ammonia water for 30 seconds, then take it out, heat it to 400°C in an ammonia environment and keep it for 4 hours, then continue to naturally Cool d...

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Abstract

The invention discloses a preparation method of an organophosphorus pesticide sensor based on a nickel nitride array, and belongs to the technical field of new nano functional materials and biosensinganalysis technology. The method comprises the following steps: firstly preparing an array of nickel nitride nanosheets on a disposable electrode, directly preparing a polydopamine film containing anelectron mediator and a molecularly imprinted polymer using the organophosphorus pesticide molecule as a template molecule successively on the array of nickel nitride nanosheets one after another by adopting an in-situ growth method and utilizing a large specific surface area and a high adsorption activity for amidogen, and eluting the molecularly imprinted polymer of the template molecule after the template molecule is eluted and the original position of the template molecule became a hole, thereby preparing an organophosphorus pesticide sensor.

Description

technical field [0001] The invention relates to a preparation method and application of an electrochemical sensor. It belongs to the technical field of new nano functional materials and chemical biosensors. Background technique [0002] Organophosphorus pesticides refer to organic compound pesticides containing phosphorus. It is mainly used to control plant diseases, insects and weeds. Its widespread use in agricultural production has resulted in varying degrees of residues in crops. The harm of organophosphorus pesticides to the human body is mainly acute toxicity, which mostly occurs after large doses or repeated exposure, and a series of neurotoxic symptoms will appear, such as sweating, tremors, mental confusion, language disorders, and severe respiratory paralysis. even death. At present, the methods for detecting organophosphorus pesticide molecules mainly include enzyme-linked immunoassay, high performance liquid chromatography, and mass spectrometry. Such method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30G01N27/327
CPCG01N27/26G01N27/30G01N27/3278
Inventor 刘召壹张勇杜斌
Owner UNIV OF JINAN
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