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Doped polyaniline based solid acid radical electrode and preparation method thereof

A polyaniline and solid acid technology, which is applied in the field of electrochemical detection, can solve the problems that liquid membrane electrodes are not suitable for in-situ measurement, affect electrode stability, and are difficult to integrate electrodes, and achieve short measurement time, short response time, and easy volume. Effect

Active Publication Date: 2016-05-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of electrode is difficult to miniaturize and is not easy to integrate with other electrodes; and the internally charged electrolyte will diffuse through the sensitive membrane, resulting in a change in its concentration, resulting in signal drift and affecting the stability of the electrode
[0003] Due to the above reasons, liquid film electrodes are not suitable for in-situ measurements, especially for long-term monitoring of marine environments

Method used

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  • Doped polyaniline based solid acid radical electrode and preparation method thereof
  • Doped polyaniline based solid acid radical electrode and preparation method thereof
  • Doped polyaniline based solid acid radical electrode and preparation method thereof

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preparation example Construction

[0024] The steps of the preparation method based on the solid acid radical electrode of doping polyaniline are as follows:

[0025] 1) Clean the metal wire 1 with a length of 3-5 cm ultrasonically in acetone solution to remove surface oil, then ultrasonically clean it in 1-2M dilute hydrochloric acid to remove oxides, then ultrasonically clean it with deionized water and dry it ;

[0026] 2) Prepare 0.5-1M aniline hydrochloride solution with aniline and hydrochloric acid at a molar ratio of 1:1, or dissolve aniline hydrochloride flake solid in deionized water to prepare 0.5-1M aniline hydrochloride solution; The chemical workstation uses cyclic voltammetry to electroplate a layer of polyaniline 2 on the surface of the metal wire 1; wherein, the scanning voltage is 0-0.5V, the scanning speed is 50mV / s, and the scanning cycle number is 5-20cls; the metal in the three-electrode system Wire 1 is the working electrode, the auxiliary electrode is a Pt electrode, and the reference e...

Embodiment 1

[0030] 1) The gold wire 1 with a length of 3 cm was ultrasonically cleaned in acetone solution to remove surface oil, and then ultrasonically cleaned in 1M dilute hydrochloric acid to remove oxides, then ultrasonically cleaned with deionized water and dried;

[0031] 2) Add 4.66g of aniline and 50mL of 1M hydrochloric acid into a 100mL volumetric flask, add water to the mark line to prepare a 0.5M aniline hydrochloride solution; use cyclic voltammetry to electroplate a layer of polyaniline on the surface of gold wire 1 through CHI760D electrochemical workstation 2; Among them, the scanning voltage is 0-0.5V, the scanning speed is 50mV / s, and the scanning cycle number is 20cls; the gold wire 1 in the three-electrode system is the working electrode, the auxiliary electrode is a Pt electrode, and the reference electrode is a commercial Ag / AgCl Electrode; after the electroplating is completed, rinse the electrode with absolute alcohol to remove the aniline oligomers on the surface ...

Embodiment 2

[0034] 1) The silver wire 1 with a length of 4 cm was ultrasonically cleaned in acetone solution to remove surface oil stains, then ultrasonically cleaned in 2M dilute hydrochloric acid to remove oxides, then ultrasonically cleaned with deionized water and dried;

[0035] 2) Weigh 0.972g of aniline hydrochloride flaky solid and dissolve it in 15mL of deionized water to prepare a 0.5M aniline hydrochloride solution; use CHI760D electrochemical workstation to electroplate a layer of polyaniline 2 on the surface of silver wire 1 by cyclic voltammetry; Among them, the scanning voltage is 0-0.5V, the scanning speed is 50mV / s, and the scanning cycle number is 10cls; in the three-electrode system, the silver wire 1 is the working electrode, the auxiliary electrode is a Pt electrode, and the reference electrode is a commercial Ag / AgCl electrode; After completion, rinse the electrode with absolute alcohol to remove the aniline oligomers on the surface of the electrode, and wait for the ...

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Abstract

The invention discloses a doped polyaniline based solid acid radical electrode and a preparation method thereof. The solid acid radical electrode comprises a metal wire, polyaniline and acid radical doped polyaniline, and the latter is an acid radical ion sensitive membrane. During preparation, a layer of polyaniline is firstly electroplated on the lower surface of the metal wire, and then by means of electrochemical action in an acid solution or salt solution, acid radical doped polyaniline can be formed. The doped polyaniline based solid acid radical electrode prepared by the method provided by the invention has the advantages of simple preparation, high mechanical strength, large toughness, high sensitivity, small volume, fast detection response, low detection lower limit, and long service life, etc. And the doped polyaniline based solid acid radical electrode can support the use of all solid-state reference electrodes, and is suitable for on-line detection and long-term in-situ monitoring of the content of acid radicals in seawater, aquaculture water and chemical water media.

Description

technical field [0001] The invention relates to electrochemical detection technology, in particular to a solid acid radical electrode based on doped polyaniline and a preparation method thereof. Background technique [0002] The content of acid radicals in water is an important indicator of water quality monitoring, and it is also of great significance to the monitoring and research of the degree of eutrophication of water, the distribution of seawater nutrients, and industrial pollution. At present, in addition to the traditional spectrophotometric method of sampling and detecting acid radical content, the most widely used acid radical ion selective electrode is a liquid membrane electrode with an internal reference electrode and an internal charged electrolyte. However, this type of electrode is difficult to miniaturize, and it is not easy to integrate with other electrodes; and the internally charged electrolyte will diffuse through the sensitive membrane, resulting in a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/333
Inventor 叶瑛黄元凤张潇阚雅婷赵玥周一凡贾健君
Owner ZHEJIANG UNIV
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