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Preparation method and application of a reproducible PDMS-based Ag/AgCl microelectrode

A micro-electrode, repeatable technology, applied in the field of electrochemistry, can solve the problems of Ag/AgCl layer easy to fall off, low sensitivity, etc., achieve the effect of low cost, simple preparation method and good application prospect

Active Publication Date: 2020-05-19
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Ag / AgCl layer on the surface of the inkjet printed Ag electrode is easy to fall off after oxidation, resulting in a sustainable and stable working time of only 30 minutes.
And Rius-Ruiz [2] The Ag / AgCl reference electrode modified by carbon nanotubes can work stably after 3 minutes, and the sensitivity is low

Method used

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  • Preparation method and application of a reproducible PDMS-based Ag/AgCl microelectrode
  • Preparation method and application of a reproducible PDMS-based Ag/AgCl microelectrode
  • Preparation method and application of a reproducible PDMS-based Ag/AgCl microelectrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) The ITO glass was ultrasonically cleaned with deionized water, acetone and ethanol for 20-40 minutes respectively. After cleaning, put it into an ozone cleaner for surface hydroxylation. Then the ITO glass was self-assembled layer by layer in a solution of 1 mg / mL PDDA (polydiallyl dimethyl ammonium chloride) and 1 mg / mL PSS (sodium polystyrene sulfonate). The number of self-assembled layers is 6 layers.

[0018] (2) On the assembled ITO glass, the chronoamperometry method is used to electrochemically deposit silver. After electrochemical deposition, a layer of white dendritic nano-silver is deposited on the ITO glass, which is called ITO-Ag. The electrolyte used for electrochemical deposition has a concentration of 0.01mol / LAgNO 3 and concentration 0.05mol / LNaNO 3 The mixed solution, the reference electrode is a saturated mercurous sulfate electrode, the counter electrode is a platinum wire, and the working electrode is an assembled ITO glass. The electrochemic...

Embodiment 2

[0022] The Ag / AgCl reference electrode was prepared by the method of Example 1, the difference from Example 1 is that the deposition time of nano-silver is 1600s.

Embodiment 3

[0024] The Ag / AgCl reference electrode was prepared by the method of Example 1, the difference from Example 1 is that the deposition time of nano-silver is 2400s.

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Abstract

The invention relates to a preparation method and an application of a reusable Ag / AgCl microelectrode based on PDMS. The Ag / AgCl electrode is prepared by a chemical oxidation method by taking PDMS asa substrate of a reference electrode, and nano silver in a dendritic structure as a working layer of the electrode. PDMS serves as the substrate of the reference electrode, has the advantages of low cost, recycling and the like, is a flexible and nontoxic material, and allows the electrode to be biocompatible. The nano silver in the dendritic structure is embedded and attached onto the flexible PDMS substrate as the working layer of the electrode, so that the electrode has higher working stability (delta E (1mv)) and sensitivity (t approximately equal to 59.32s); a potential of the electrode is less than that of the traditional commercial electrode by about 40.95%; a measurement interval of the reference electrode is greatly enlarged. The prepared electrode can operate continuously for above 1h. The preparation method is simple and easy to operate, and the obtained electrode can be widely applied to a micro-channel system and used for organism sensor development, and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a preparation method and application of a reusable PDMS-based Ag / AgCl microelectrode. Background technique [0002] In the recent research of electrochemistry, the research of miniature reference electrode has been paid much attention. Ag / AgCl electrode is one of the most widely used reference electrodes. Because of its stable operation, simple preparation process and no safety hazards, it will be of great significance to use it in biological monitoring and microfluidic detection. At present, the preparation of micro-Ag / AgCl electrodes mainly adopts screen printing technology, using PET as the electrode substrate, silver ink as the conductive paste, and printing the silver paste on the substrate to make the electrode. Although the method is simple to operate and can be mass-produced industrially, the state of the electrode surface is not easy to control, and the perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/327G01N27/416C25D3/46
CPCC25D3/46G01N27/301G01N27/327G01N27/416
Inventor 孙晶王清翔申贵隽郎明非
Owner DALIAN UNIV