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Solid hydrogen ion concentration electrode based on conductive polyaniline and preparing method thereof

A conductive polyaniline and polyaniline technology, which is applied in the field of electrochemical detection, can solve the problems of easy signal drift, short service life, large size, etc., and achieve the effects of avoiding secondary pollution, high sensitivity and small size

Inactive Publication Date: 2013-04-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of liquid film electrodes include: larger size, fragile, prone to signal drift, and short service life

Method used

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  • Solid hydrogen ion concentration electrode based on conductive polyaniline and preparing method thereof

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preparation example Construction

[0038] The steps of the preparation method of the solid pH electrode based on conductive polyaniline are as follows:

[0039] 1) The metal wire 1 with a length of 5-15 cm is ultrasonically cleaned in acetone solution to remove surface oil, then ultrasonically cleaned in 1-2M dilute hydrochloric acid to remove oxides, then ultrasonically cleaned with deionized water and dried ;

[0040] 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 conductive polyaniline 2 on the surface of the metal wire 1; among them, the scanning potential is 0-0.45V, the scanning speed is 50mV / s, the sampling interval is 1mV, and the sensitivity is 10 -4 A / V; metal wire 1 is used as anode, the auxiliary electrode is Pt electrode, and the reference electrode...

Embodiment 1

[0060] 1) The metal wire 1 with a length of 10 cm was ultrasonically cleaned in acetone solution to remove surface oil, then ultrasonically cleaned in 1M dilute hydrochloric acid to remove oxides, then ultrasonically cleaned with deionized water and dried;

[0061] 2) Weigh 1.9439g of commercial aniline hydrochloride flaky solid and dissolve it in 15ml of deionized water to prepare a 1M aniline hydrochloride solution; use CHI760D electrochemical workstation to electroplate a layer of conductive polyaniline on the surface of metal wire 1 by cyclic voltammetry 2.

[0062] The experimental parameters are: scanning potential 0-0.45V, scanning speed 50mV / s, sampling interval 1mV, sensitivity 10 -4 A / V; metal wire 1 is used as anode, the auxiliary electrode is Pt electrode, and the reference electrode is commercial Ag / AgCl electrode; insert the three electrodes into 1M aniline hydrochloride solution at the same time, scan continuously for 20 cycles, and use anhydrous Rinse the elec...

Embodiment 2

[0072] 1) The metal wire 1 with a length of 8 cm was ultrasonically cleaned in acetone solution to remove surface oil, then ultrasonically cleaned in 2M dilute hydrochloric acid to remove oxides, then ultrasonically cleaned with deionized water and dried;

[0073] 2) Weigh 10.1388g of hydrochloric acid and 9.313g of aniline respectively, and add water to the scale in a 100ml volumetric flask to obtain a solution of hydrochloric acid:aniline=1M:1M; Plating a layer of conductive polyaniline 2;

[0074] The experimental parameters are: scanning potential 0-0.45V, scanning speed 50mV / s, sampling interval 1mV, sensitivity 10 -4 A / V; metal wire 1 is used as anode, the auxiliary electrode is Pt electrode, and the reference electrode is commercial Ag / AgCl electrode; insert the three electrodes into 1M aniline hydrochloride solution at the same time, scan continuously for 20 cycles, and use anhydrous Rinse the electrode with alcohol, and use it after the alcohol evaporates;

[0075] ...

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Abstract

The invention discloses a solid hydrogen ion concentration (PH) electrode based on conductive polyaniline and a preparing method thereof. The solid PH electrode based on the conductive polyaniline comprises a metal wire, the conductive polyaniline, soluble conductive polyaniline, hydrogen ion sensitive film and a heat shrink tube, wherein a layer of the conductive polyaniline is electroplated on the surface of the lower portion of the metal wire, a layer of the soluble conductive polyaniline is wrapped on the outer surface of the conductive polyaniline, the hydrogen ion sensitive film is wrapped on the outer surface of the soluble conductive polyaniline, and the heat shrink tube is wrapped on a portion located in the middle of the metal wire and with a distance greater than 0.5-1cm from the end portion of the hydrogen ion sensitive film. The solid PH electrode based on the conductive polyaniline has the advantages of being high in mechanical strength, large in toughness, high in sensitivity, small in size, quick in detection response, low in detection limit, long in service life and the like. When matched with a solid reference electrode for use, the solid PH electrode based on the conductive polyaniline is applicable to on line detection and long-term in situ monitoring of PH value of seawater, aquaculture water and chemistry or chemical industry water.

Description

technical field [0001] The invention relates to electrochemical detection technology, in particular to a solid pH electrode based on conductive polyaniline and a preparation method thereof. Background technique [0002] The pH value in water is an important parameter for environmental assessment, and it is of great significance for understanding the activities of organisms and microorganisms in water, and monitoring environmental pollution. The commercial pH electrodes currently used for such purposes are all liquid membrane electrodes, that is, the inside of the electrode needs to be filled with an electrolyte solution, the so-called "salt bridge", whose function is to conduct the detected response between the ion-sensitive membrane and the metal wire Signal. The main disadvantages of liquid film electrodes include: larger size, fragile, prone to signal drift, and short service life. [0003] Compared with traditional liquid film electrodes, solid electrodes have comprehe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/333
Inventor 叶瑛丁茜黄元凤潘依雯郑豪李俊殷天雅陈雪刚夏枚生刘舒婷
Owner ZHEJIANG UNIV
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