Preparation method and application of a PDMS-based AG/AGCL microelectrode encapsulation film

An encapsulating film and microelectrode technology, applied in the field of electrochemistry, can solve the problems of unsolved storage of supporting electrolyte, easy detachment of Ag/AgCl layer, short sustainable and stable working time, etc., and achieves stable work, low cost, and sensitivity. high effect

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 short sustainable and stable working time of only 30 minutes.
This is also related to its direct contact with the solution to be tested. The prerequisite for the stable operation of the reference electrode is to provide it with a constant concentration of supporting electrolyte, and the problem of supporting electrolyte storage has not been solved in this field.

Method used

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  • Preparation method and application of a PDMS-based AG/AGCL microelectrode encapsulation film
  • Preparation method and application of a PDMS-based AG/AGCL microelectrode encapsulation film
  • Preparation method and application of a PDMS-based AG/AGCL microelectrode encapsulation film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of Ag / AgCl electrode:

[0022] The electrode substrate is prepared by mixing 90wt% PDMS and 10wt% silane coupling agent and curing at 100°C for 2 hours, and then hydrophilically modifying the electrode substrate. The modification solution consists of 5wt% (Gly) and 2wt% (PVA) Composition, soak the PDMS substrate in the modification solution for 20 minutes, take it out and dry it at 60°C for 2 hours and repeat the operation three times, and finally coat the silver nanowires evenly, dry at 60°C for 2 hours, then perform electrode oxidation treatment, soak in NaClO (20mg / mol) In the process, the Ag / AgCl electrode was obtained as the electrode working layer after being rinsed with deionized water and dried at 60 °C for 2 h.

[0023] The middle layer adopts PDMS (prepared by mixing 90wt% PDMS and 10wt% silane coupling agent and curing at 100°C for 2h, and finally hollows out according to the shape of the electrode. The upper layer is a PDMS film (made of 80wt% PD...

Embodiment 2

[0025] The three-electrode system consists of a glassy carbon electrode as the working electrode, Ag / AgCl as the reference electrode, and platinum wire as the auxiliary electrode.

[0026] 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.

[0027] Adopt the three-electrode system of this embodiment to carry out electrode test:

[0028] Place the electrode in the PBS (10×) buffer solution of the three-electrode system. Under the three-electrode system, adopt the chronopotentiometry, set the cathode current to 2μA, the anode current to 2μA, the cathode time to 2s, and the anode time to is 600s, the initial polarity is anode, the data storage interval is 0.01s, the number of segments is 2, and the electrode polarity switching method is time.

[0029] For the selectio...

Embodiment 3

[0032] The anion and cation exchange membranes were used as the reference electrode encapsulation material to carry out the impedance test, and the influence of different encapsulation materials on the working performance of the electrode was compared.

[0033] The test system is a three-electrode system, which consists of a glassy carbon electrode as a working electrode, an Ag / AgCl microelectrode as a reference electrode, and a platinum wire as an auxiliary electrode.

[0034] The three-electrode system was placed in KCl (10 -4 mol / L) solution, under the three-electrode system, adopt the impedance method, set the test time as 600s, the upper limit frequency as 10Hz, and the lower limit frequency as 100000Hz. The test results are attached image 3 .

[0035] Such as image 3 It is shown that the PDMS encapsulating membrane prepared by the present invention has the smallest impedance radius and the smallest resistance value in the low frequency region, compared with the anio...

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Abstract

The invention relates to the field of preparation of electrochemical electrodes, in particular to a preparation method and application of an Ag / AgCl (silver / silver chloride) micro-electrode packagingfilm based on PDMS (polydimethylsiloxane). The packaging film is prepared by the following steps of mixing 80wt% of PDMS and 20wt% of curing agent, curing at the temperature of 100 DEG C, and finallyperforating, so as to obtain the packaging film. The packaging film has the advantages that the PDMS is used as a reference electrode for the first time; the cost is low, the recycling and reutilization effects are realized, and the like; compared with the cationic exchange film and anionic exchange film, the working is more stable, the sensitivity is higher, and the measuring space is wider; theelectrode using the packaging film can be used for developing a biological sensor, and the good application prospect is realized.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a preparation method and application of a PDMS-based Ag / AgCl microelectrode encapsulation film. 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 t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
CPCG01N27/307
Inventor 孙晶王清翔申贵隽郎明非
Owner DALIAN UNIV
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