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Preparation method of electrochemical sensor based on polyaniline nanofiber

A nanofiber and polyaniline technology, applied in the field of electrochemical sensor preparation, can solve the problems of low sensitivity and selectivity, and the performance of practical application needs to be improved, and achieve the effect of wide linear range, low detection limit and high sensitivity

Inactive Publication Date: 2012-08-22
WUXI BAILING SENSING TECH
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Problems solved by technology

Although many methods have been used to detect nitrite ions, such as spectroscopy and chromatography, there are still deficiencies: first, the sensitivity and selectivity are not high, and second, the actual application performance needs to be improved
However, simple and sensitive electrochemical sensors based on polyaniline nanofiber electrodes have not been investigated for the detection of nitrite ions.

Method used

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Embodiment Construction

[0011] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with implementation.

[0012] A preparation method of an electrochemical sensor based on polyaniline nanofibers, the steps are as follows:

[0013] (1) The preparation process of polyaniline nanofiber: the aniline of 0.298g is joined in the HCl solution of 10ml1.0mol / L earlier, in the 0.186g ammonium persulfate (APS, (NH 4 ) 2 S 2 o 8 ) is dissolved in the HCl solution of 10ml 1.0mol / L, prepares initiator solution; The initiator solution is poured into monomer solution (the HCl solution of aniline, APS / aniline is 1: 4), through polymerization reaction at room temperature Under static conditions for 10 minutes, the obtained polyaniline precipitate was filtered, washed five times, and then vacuum-dried at 50°C for 24 hours;

[0014] (2) Preparation of polyaniline nanofiber-modified electrochemical sensors: glassy carbon electrodes were fi...

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Abstract

The invention relates to a preparation method of an electrochemical sensor based on polyaniline nanofiber. The preparation method comprises the following steps of: firstly, preparing polyaniline nanofiber; then, dispersing the purified polyaniline nanofiber under ultrasonic oscillation into deionized water to form green suspension; and coating 10uL of water solution of the polyaniline nanofiber on the surface of a glass carbon electrode, and drying to obtain a modified electrode so as to prepare the electrochemical sensor based on polyaniline nanofiber. The sensor prepared by the invention shows high electro-catalysis activity to the reduction of nitrite ion, has high sensitivity, wide linear range, low detection limit and good stability, and provides a new way for monitoring the reaction process of ascorbic acid and nitrite ion.

Description

Technical field: [0001] The invention relates to a preparation method of an electrochemical sensor, in particular to a preparation method of an electrochemical sensor based on polyaniline nanofibers for accurately detecting nitrite and sensitively monitoring the reaction of ascorbic acid to remove nitrite ions. Background technique: [0002] Conductive polymers, such as polyaniline, polypyrrole, polythiophene, and polystyrene, have been extensively studied because of their potential applications in electronics, electroluminescence, optoelectronic devices, and analytical chemistry. Among all conjugated polymers, polyaniline is the most attractive conductive polymer because of its high conductivity, simple preparation method, good environmental stability and wide application in the field of electrochemical sensors. In recent years, many studies have focused on nanostructured polyaniline. Compared with the traditional polyaniline, besides the aforementioned advantages, the nan...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N27/30
Inventor 孙京华王锦潘正海
Owner WUXI BAILING SENSING TECH
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