Solid contact type ion-selective electrode based on nanoporous gold and preparation thereof

A nanoporous gold, ion-selective technology, applied in the direction of material analysis, measurement devices, instruments, etc. by electromagnetic means, can solve problems such as hindering the reuse of electrodes, restricting the development of miniaturized ion-selective electrodes, etc., and achieve good potential stability. Reproducibility and repeatability, saving production costs, the effect of large specific surface area

Inactive Publication Date: 2014-10-01
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these conductive layers are additionally added to the conductive substrate, and its weak adhesion to the conductive substrate hinders the repeated use of this type of electrode and limits the development of miniaturized ion-selective electrodes.

Method used

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  • Solid contact type ion-selective electrode based on nanoporous gold and preparation thereof
  • Solid contact type ion-selective electrode based on nanoporous gold and preparation thereof
  • Solid contact type ion-selective electrode based on nanoporous gold and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1 Preparation of Nanoporous Gold-Modified Electrode Substrate and Comparison with Bare Gold Wire Electrode

[0048] The preparation of the nanoporous gold-modified electrode substrate includes the following steps:

[0049] (1) Dissolve 1.6M zinc chloride in 50ml benzyl alcohol in an oil bath at 60°C;

[0050] (2) inserting the working electrode gold wire electrode (250 μm in diameter), the auxiliary electrode zinc sheet and the reference electrode zinc wire into the organic solvent prepared in step (1);

[0051] (3) Connect the three-electrode system in step (2) to an electrochemical workstation, apply a multi-cycle potential linear scan to the gold electrode, the scanning potential range is -0.72-1.88V, the scanning speed is 0.01V / s, and the number of cycles is 10 times, the temperature is 120℃;

[0052] (4) The electrode prepared in step (3) is sequentially washed with benzyl alcohol, ethanol and distilled water on the surface of the electrode to obtain a na...

Embodiment 2

[0057] Example 2 Potential response of potassium ion-selective electrode based on nanoporous gold

[0058] The preparation of potassium ion-selective electrodes based on nanoporous gold, including:

[0059] (1) According to the preparation steps of the electrode matrix in Example 1, a nanoporous gold-modified electrode matrix was obtained;

[0060] (2) drop-coating a polymer membrane solution containing potassium ion carrier on the surface of the electrode substrate prepared above, and drying at room temperature to form a potassium ion-selective polymer membrane, that is, to obtain a solid contact ion-selective electrode (see figure 1 ).

[0061] Among them, the polymer film solution contains 1.0% valinomycin by mass, 0.6% sodium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, 32.8% polyvinyl chloride, 65.8% % o-nitrophenyl octyl ether, the mass ratio of solvent tetrahydrofuran and all the above solutes is 8:2.

[0062] Investigate the potential response of the potassium io...

Embodiment 3

[0063] Example 3 Reusability of nanoporous gold-modified electrode substrates

[0064] The reusability of nanoporous gold-modified electrode substrates was investigated, including:

[0065] (1) The ion-selective electrode prepared in Example 2 was placed in a tetrahydrofuran solution and magnetically stirred for 2 hours to remove the potassium ion-selective polymer membrane, and then ethanol and ultrapure water were used to wash the recovered nanoporous gold for many times. the electrode substrate;

[0066] (2) The electrode substrate recovered above was placed in a 0.1M KCl solution to measure its cyclic voltammetry response diagram, the scanning potential range was -0.5-0.5V, and the scanning speed was 0.1V / s. Compared with the newly prepared nanoporous gold-decorated electrode substrates, such as Image 6 As shown, the electric double layer capacitance change of the two is less than 15%, indicating that the nanoporous gold-modified electrode substrate is reusable.

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Abstract

The invention relates to the technical field of electrochemical sensors, and particularly relates to a solid contact type ion-selective electrode based on nanoporous gold and a preparation method of the solid contact type ion-selective electrode. The electrode comprises an electrode substrate and an ion-selective polymer film, wherein the ion-selective polymer film coats the surface of the electrode substrate through a dropping manner, and the electrode substrate is an electrode modified by the nanoporous gold. The ion-selective electrode can be applied to detecting the ion concentration of a solution. The ion-selective electrode provided by the invention has the advantages of simplicity in preparation and good stability, and a new idea is provided for the development of miniaturized ion-selective electrodes.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to a solid contact ion selective electrode based on nanoporous gold and a preparation method thereof. Background technique [0002] Ion-selective electrodes are an important branch of electrochemical sensors, and their detection principle is based on the relationship between the response potential of the sensitive membrane and the analyte ion activity conforming to the Nernst equation. It has the advantages of convenience, rapidity, sensitivity, accuracy and low price, and has been widely used in the fields of environmental monitoring, clinical analysis and industrial testing. The traditional ion-selective electrode consists of a sensitive membrane, an internal filling liquid and an internal reference electrode. However, the existence of the inner filling liquid limits the widespread use of such sensors, such as the need for frequent maintenance to prevent the inner...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/333
Inventor 尹坦姬秦伟潘大为
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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