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Integrated ultramicro electrode, preparation method thereof and application

An ultra-micro electrode and electrode technology, applied in the direction of electrochemical variables of materials, material analysis by electromagnetic means, measurement devices, etc., can solve the problems of limiting test time, slow change of concentration, etc., to enhance spatial resolution and reduce sample size. The effect of simple consumption, preparation method

Inactive Publication Date: 2020-05-12
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the device still needs milliliter-level support electrolyte solution to connect to the three-electrode system, and the slow diffusion of redox substances in the detection solution to the support electrolyte solution will cause its concentration to change slowly, which limits its test time

Method used

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  • Integrated ultramicro electrode, preparation method thereof and application
  • Integrated ultramicro electrode, preparation method thereof and application
  • Integrated ultramicro electrode, preparation method thereof and application

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Embodiment Construction

[0030] The present invention is described in further detail below in conjunction with accompanying drawing:

[0031] Such as Figure 1 to Figure 3 As shown, an integrated ultra-microelectrode includes a θ-shaped glass microtube 4, and the θ-shaped glass microtube 4 is provided with a glass diaphragm 5 along the axial direction so that the θ-shaped glass microtube 4 forms two cavities, and the two cavities A counter electrode 2 and a working electrode 1 are respectively arranged inside, the two ends of the θ-shaped glass microtube 4 are sealed, the counter electrode 2 and the working electrode 1 at one end of the θ-shaped glass microtube 4 are connected to the testing instrument, and the other end of the θ-shaped glass microtube 4 The counter electrode 2 and the working electrode 1 protrude from the end face of the θ-shaped glass microtube 4 as the detection contact end.

[0032] The counter electrode 2 is a platinum wire electrode, and the protruding length at the detection c...

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Abstract

The invention discloses an integrated ultramicro electrode, a preparation method thereof and application. According to the integrated ultramicro electrode, an ultramicro working electrode and a counter electrode are integrated in a theta-type glass microtube, so that a two-electrode system can be formed; the minimum iR drop of the ultramicro electrode provides a basis and guarantee for the construction of the two-electrode system. According to an integrated ultramicro electrode probe, only microliters of solution is needed in single measurement, so that the consumption of samples is greatly reduced; meanwhile, the spatial resolution, portability and on-site detection capability of the probe are enhanced, so that the probe is suitable for the in-situ electrochemical detection of electroactive substances, enzyme activity and biological samples in a homogeneous solution with any microliter-level volume; a test process is not limited by the volume and measurement time of a supporting electrolyte solution in a three-electrode system micro electrochemical detection device; the assistance of the milliliter-level supporting electrolyte solution is not needed, measurement can be directly carried out, and therefore, detection efficiency is improved.

Description

technical field [0001] The invention belongs to the in-situ electrochemical detection technology of microliter volume samples, and in particular relates to an integrated ultramicro electrode and its preparation method and application. Background technique [0002] Ultramicro electrodes are smaller than 25 μm in at least one dimension. Compared with conventional electrodes, ultra-micro electrodes have new characteristics and unique advantages, including small electric double layer capacitance, fast response, and high signal-to-noise ratio; extremely small iR drop, which can be used for both Electrode system and non-aqueous or high-resistance system; high mass transfer rate, can quickly reach a steady state; steady-state current is quantitative; small physical size, high spatial resolution. Therefore, ultramicroelectrodes have greatly expanded the application range of electroanalytical chemistry methods in terms of space, time, chemical media and methodology, and are widely us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 张德文陈芳明王健周颖琳张新祥
Owner XI AN JIAOTONG UNIV
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