A preparation method and application of a reproducible PDMS-based microsoft Ag/AgCl electrode

A repeatable, electrode-based technology, applied in the field of electrochemistry, can solve the problems of Ag/AgCl layer easy to fall off, low sensitivity, etc., and achieve the effect of low cost, wide application and easy storage

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

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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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  • A preparation method and application of a reproducible PDMS-based microsoft Ag/AgCl electrode
  • A preparation method and application of a reproducible PDMS-based microsoft Ag/AgCl electrode
  • A preparation method and application of a reproducible PDMS-based microsoft Ag/AgCl electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 prepares Ag / AgCl reference electrode:

[0027] 1. Preparation of electrode substrate mold:

[0028] (1) Prepare two gluing machines and adjust them to 65°C and 200°C for standby respectively. Take a new silicon wafer and blow it clean with nitrogen, place it on a hot plate, and heat it on the 200°C gluing machine for 5 minutes. The wafer was then cooled at room temperature.

[0029] (2) Place the center of the silicon wafer in alignment with the center of the turntable of the homogenizer, drop the photoresist on the center of the silicon wafer, no air bubbles can be generated during the dropping process, and slowly shake the glue at a speed of 500r / min for 20s , and then place the silicon wafer on a 65° C. baker for 5 minutes, and heat it at 95° C. for 20 minutes. After the heating, the silicon wafer is cooled at room temperature for 10 minutes.

[0030] (3) Place the silicon wafer in the mask and expose it under a UV exposure machine with a wavelength of...

Embodiment 2

[0038] The Ag / AgCl electrode prepared in Example 1 was used as a reference electrode, the glassy carbon electrode was used as a working electrode, and the platinum wire was used as an auxiliary electrode to form a three-electrode system.

[0039] Pretreatment of glassy carbon electrodes: Grinding and activating glassy carbon electrodes, using Al with different particle sizes 2 0 3 The powder, from large to small, is placed on the buckskin and dripped with less than deionized water to polish the electrode.

[0040] Adopt the three-electrode system of this embodiment to carry out electrode test:

[0041]The three-electrode system is placed in the PBS (10x) buffer solution. Under the three-electrode system, the chronopotentiometry is used to set the cathodic current to 2 μA, the anode current to 2 μA, the cathodic time to 2 s, and the anodic time to 600 s , the initial polarity is anode, the data storage interval is 0.01s, the number of segments is 2, and the electrode polarity...

Embodiment 3

[0044] The three-electrode system consists of a glassy carbon electrode as a working electrode, the nanowire Ag / AgCl prepared in Example 1 as a reference electrode, and a platinum wire as an auxiliary electrode.

[0045] Pretreatment of glassy carbon electrodes: Grinding and activating glassy carbon electrodes, using Al with different particle sizes 2 0 3 The powder, from large to small, is placed on the buckskin and dripped with less than deionized water to polish the electrode.

[0046] Adopt the three-electrode system of this embodiment to carry out electrode test:

[0047] The three-electrode system was placed in potassium ferricyanide (10 -6 mol / L) solution, under the three-electrode system, using cyclic voltammetry, set the scanning potential range from -0.8 to 1.0v, the scanning speed is 0.1v / s, and the number of cycles is 1 cycle. The cyclic voltammetry curve is shown in Figure 15 .

[0048] The process parameters for the preparation of the reference electrode Ag / ...

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Abstract

The invention relates to the field of electrochemical electrode preparation, and in particular to a preparation method and application of a PDMS-based (polydimethylsiloxane-based) flexible Ag / AgCl microelectrode capable of being repetitively used. The invention adopts flexible PDMS as an electrode substrate material, the electrode substrate material undergoes surface hydrophilic modification, a silver nanowire is then evenly applied, and the electrode substrate material is then immersed in an NaClO solution and oxidized, so that the Ag / AgCl microelectrode is prepared. When adopted as a reference electrode, the Ag / AgCl microelectrode disclosed by the invention shows good working stability and sensitivity, moreover, the working potential is lower than working potentials of conventional electrodes, and the Ag / AgCl microelectrode can continuously work for one hour or longer. The electrode disclosed by the invention can be repetitively used, the material is poison-less and high in biocompatibility, and can be widely applied in microchannel systems, and the electrode can be developed into a biosensor.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to the preparation and application of a reusable PDMS-based microfluidic electrode Ag / AgCl electrode. 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, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
CPCG01N27/30G01N27/308
Inventor 孙晶王清翔申贵隽郎明非
Owner DALIAN UNIV
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