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Universal two-electrode modified electrode unit and preparation method and application thereof

A technology for modifying electrodes and electrodes, which is applied in the field of electrochemical analysis and detection to achieve excellent electrocatalytic activity and stability, simple operation, good sensitivity and reproducibility

Active Publication Date: 2018-05-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a general-purpose two-electrode graphene-modified electrode unit has not been reported yet.

Method used

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  • Universal two-electrode modified electrode unit and preparation method and application thereof
  • Universal two-electrode modified electrode unit and preparation method and application thereof
  • Universal two-electrode modified electrode unit and preparation method and application thereof

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Embodiment 1

[0039] This embodiment is aimed at the small-batch preparation of electrode units, which is achieved through the following technical solutions, including etching and cutting of electrode units, fabrication of liquid storage pools, protective modification of cathodes of electrode units and modification of anodes. In this embodiment, indium tin oxide conductive glass (ITO) is selected as the electrode substrate, and electrodeposited gold nanomaterials are selected as the inert metal modified cathode, so as to figure 1 Take the etching pattern as an example to make electrode units.

[0040] (1) The ITO electrode is etched by photolithography, which needs to go through the steps of cleaning, glue coating, pre-baking, exposure, development, etching, glue removal and inspection. details as follows:

[0041] (1.1) Sonicate the ITO electrode sheet with acetone, absolute ethanol and distilled water for 10 minutes respectively, rinse with distilled water and dry for later use.

[0042] ...

Embodiment 2

[0057] This embodiment is aimed at the small-batch preparation of electrode units, and the technical solution is the same as that of Embodiment 1. In this embodiment, indium tin oxide conductive glass (ITO) is selected as the electrode substrate, and electrodeposited gold nanomaterials are selected as the inert metal-modified cathode.

[0058] ITO etching method is identical with embodiment 1 step (1), obtains figure 1 After the pad shown, press the image 3 Cut into an array chip 31 with three electrode units connected in parallel, and make a liquid storage pool according to step (2) of Embodiment 1. After connecting three electrode units in parallel, the cathode and anode modification were carried out. The anode modification selected graphite oxide buffer solution with a concentration of 0.01 mg / mL (the buffer solution was 0.5 M phosphate buffer, pH 8), and the scanning potential was 0 V~-1.0 V , the scanning speed is 1000 mV / s, scanning 50 circles, the other is the same a...

Embodiment 3

[0061] This embodiment is aimed at the small-batch preparation of electrode units, and the technical solution is the same as that of Embodiment 1. In this embodiment, indium tin oxide conductive glass (ITO) is selected as the electrode substrate, and electrodeposited gold nanomaterials are selected as the inert metal-modified cathode.

[0062] ITO etching method is identical with embodiment 1 step (1), obtains figure 1 After the electrode sheets shown, and according to step (2) of Example 1, a liquid storage pool was made. Graphite oxide buffer solution with a concentration of 1 mg / mL (0.2 M phosphate buffer, pH 6.5) was used for anode modification. circle, the others are the same as step (3) of embodiment 1. After connecting two electrode units in series, we can get Figure 4 The isolated bipolar electrode chip shown.

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Abstract

The invention discloses a universal two-electrode modified electrode unit and a preparation method and application thereof. A conductive electrode material substrate is prepared by a photoetching method, a polydimethylsiloxane chip serves as a liquid storage tank, and a cathode and an anode are respectively modified by an electrochemically deposited inert metal protective film and reduced grapheneoxide to obtain the modified electrode unit. The modified electrode unit has outstanding electrocatalytic activity and stability, has very good sensitiveness and reproducibility when used for detecting such biomolecules as hydrogen peroxide and ascorbic acid, and can be connected in parallel into an electrode assembly for batch detection or connected in series into an isolated bipolar electrode to be applied to such fields as bipolar electrochemiluminescence.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis and detection, and in particular relates to a general two-electrode type modified electrode unit and its preparation method and application. Background technique [0002] Electrochemical analysis methods have the advantages of high sensitivity, good selectivity, simple equipment, low cost, etc., and are easy to realize automation and continuous analysis, so they are gradually widely used in the fields of environment, food, clinical, medicine, and biology. Traditional electrochemical analysis often uses a three-electrode system consisting of a working electrode, a counter electrode and a reference electrode. The instrument structure is relatively complex, and the life of the reference electrode is short, and it is easy to pollute samples in some environments. In order to meet the requirements of simplifying the instrument system, reducing the cost and versatility, electrochemical a...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/42
CPCG01N27/30G01N27/42
Inventor 叶建山戴琬琳鲁志伟刘柏辰
Owner SOUTH CHINA UNIV OF TECH
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