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Porous gold-modified interdigital electrode as well as preparation method and application thereof

An interdigital electrode and surface modification technology, applied in the field of porous gold-modified interdigital electrodes and their preparation, can solve problems such as large noise and errors, skin allergic reactions, redness and swelling, and achieve increased active surface area, increased sensitivity, high The effect of stability

Inactive Publication Date: 2018-11-13
广州钰芯传感科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, because conductive gel is often used in detection, and the electrical impedance of conductive gel is unstable, it is easy to introduce large noise and errors in high-precision experiments, resulting in inaccurate measurement results and greatly reducing the fork. Refers to the conductivity of the electrode
In addition, before using the Ag / AgCl electrode, the skin must be effectively treated, and the stratum corneum on the skin surface must be wiped off as much as possible. A certain amount of preparation time is required, otherwise the conductive gel may cause skin allergic reactions, redness, swelling, etc. making certain measurements difficult to perform

Method used

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  • Porous gold-modified interdigital electrode as well as preparation method and application thereof
  • Porous gold-modified interdigital electrode as well as preparation method and application thereof
  • Porous gold-modified interdigital electrode as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Nanoporous gold-modified interdigitated electrodes:

[0039] (1) Soak the surface of the commercialized interdigitated electrode with 1%wt citric acid solution for 10 minutes, clean it with deionized water and set aside;

[0040] (2) Immerse the surface-treated interdigital electrode into gold citrate 10g / L, stannous sulfate 20g / L, ascorbic acid 10g / L, potassium sulfate 20g / L, dipotassium hydrogen phosphate 20g / L, and the pH value is at 4- 6, the temperature is between 45-55°C, the current density is 1.0-1.5ASF, the electrodeposition time is 5min, and then the gold-tin alloy coating is obtained.

[0041] (3) The obtained gold-tin-containing interdigitated electrode sample was immersed in 10 mol / L potassium hydroxide and 5 mol / L hydrogen peroxide for 3 hours to obtain a nanoporous gold-modified interdigitated electrode.

[0042] attached figure 1 It is the scanning electron microscope picture of the interdigitated electrode modified by nanoporous gold in Example 1 at 1...

Embodiment 2

[0044] Nanoporous gold-modified interdigitated electrodes:

[0045] (1) Soak the surface of the commercialized interdigitated electrode with 1.5%wt citric acid solution for 10 minutes, then clean it with deionized water and set aside;

[0046] (2) Immerse the surface-treated interdigital electrode into 20g / L of gold citrate, 20g / L of stannous sulfate, 10g / L of ascorbic acid, 20g / L of potassium sulfate, 20g / L of dipotassium hydrogen phosphate, and the pH value is about 5 , the temperature is between 45-55°C, the current density is 2.0-2.5ASF, the electrodeposition time is 5min, and then the gold-tin alloy coating is obtained.

[0047](3) The obtained gold-tin-containing interdigitated electrode sample was immersed in 5 mol / L potassium hydroxide and 10 mol / L hydrogen peroxide for 3 hours to obtain a nanoporous gold-modified interdigitated electrode.

[0048] attached figure 2 It is the scanning electron microscope picture of the interdigitated electrode modified by nanoporous...

Embodiment 3

[0050] Mass production of nanoporous gold-modified interdigitated electrodes:

[0051] (1) Magnetron sputtering Ti / Pt / Au on the alumina ceramic plate to form a ceramic substrate whose outer surface is gold, and the thickness of each sputtered layer is

[0052] (2) A suspension coating photoresist is used, and the thickness of the photoresist is 2 μm.

[0053] (3) Develop and expose under a photolithography machine to form interdigital electrode patterns.

[0054] (4) In potassium carbonate solution, the photoresist is developed.

[0055] (5) electroplating with glue or soaking in citric acid solution to form gold-tin alloy by electroplating, the solution is composed of gold citrate 8g / L, tin methanesulfonate 10g / L, ascorbic acid 10g / L, potassium sulfate 20g / L, Dipotassium hydrogen phosphate is 20g / L, the pH value is between 4-6, the temperature is between 45-55°C, the current density is 1.0-1.5ASF, and the electrodeposition time is 5min.

[0056] (6) Remove the photoresis...

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Abstract

The invention discloses a porous gold-modified interdigital electrode as well as a preparation method and application thereof. The porous gold-modified interdigital electrode is prepared by modifyinga surface of a common interdigital electrode with a porous gold layer, wherein the interdigital electrode is an alumina ceramic-based or polymer-based or silicon-based or metal-based interdigital electrode. The preparation method comprises the following steps: electro-depositing a gold-tin alloy layer on the surface of the interdigital electrode after treatment; removing tin in the alloy by a chemical etching method or an electrochemical etching method; washing with pure water; and drying to obtain the porous gold-modified interdigital electrode. The interdigital electrode provided by the invention has high sensitivity and stability for low-concentration biological detection and pollutant monitoring, and can be used for biological detection, electrochemical analysis or sensitive gas detection, and has wide application prospects.

Description

technical field [0001] The invention relates to the detection field of chemical or biological substances, in particular to the preparation and application of an interdigital electrode, in particular to a porous gold-modified interdigital electrode and its preparation method and application, belonging to the technical field of compound detection. Background technique [0002] Biosensor technology is a very active field of engineering technology research. It is in the intersection area of ​​life science and information science together with bioinformatics, biochip, biocybernetics, bionics, biocomputer and other disciplines. An indispensable advanced detection and monitoring device. Electrochemical sensors are a very important class of biosensors. Electrochemical sensors work by reacting with the target analyte to be measured and generating an electrical signal proportional to the concentration of the target analyte. A typical electrochemical sensor consists of a sensing elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/30G01N27/48
Inventor 奚亚男崔皓博
Owner 广州钰芯传感科技有限公司
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