Coaxial compound oxygen microelectrode and preparation method thereof

An oxygen microelectrode and a composite technology, which are applied in the field of coaxial composite oxygen microelectrodes and their preparation, can solve the problems of difficulty in obtaining the diameter of the microelectrode tip, limited application range of the microelectrode, complicated and difficult control process, and the like. The effect of simplifying the electrode fabrication process, increasing electrode drawing power, and high spatial resolution

Active Publication Date: 2015-08-26
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the protective cathode added in this form also brings a series of disadvantages
Including: In order to leave space for the protective cathode, the tip diameter of the glass outer tube must be increased. Therefore, it becomes very difficult to obtain a microelectrode tip diameter within 10 μm, and the application range of the microelectrode is greatly limited; precise adjustment work The distance between the cathode and the tip of the protective cathode is completely dependent on the microscope and manual operation, the adjustment process is complex and difficult, and the drawing efficiency is low

Method used

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  • Coaxial compound oxygen microelectrode and preparation method thereof
  • Coaxial compound oxygen microelectrode and preparation method thereof
  • Coaxial compound oxygen microelectrode and preparation method thereof

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Embodiment 1

[0057] Example 1. Preparation of coaxial composite oxygen microelectrode and its performance test:

[0058] 1. Preparation of coaxial composite oxygen microelectrodes:

[0059] according to figure 1 The schematic diagram of the structure is shown to prepare the coaxial composite oxygen microelectrode:

[0060] 1) Making a working cathode: using boiling aqua regia (H 2 O:HNO 3 :HCl=4:1:3, volume ratio) corrode the tip of a platinum wire with a diameter of 0.1mm (purity 99.95%, purchased from China Pharmaceutical (Group) Shanghai Chemical Pharmacy Company) to 5-10 μm, specifically, put aqua regia Put it in a 100mL beaker and raise the temperature in a water bath, then insert the platinum wire into aqua regia 2cm, and corrode for 90min, the tip of the platinum wire can be corroded to 5μm.

[0061] Take a white glass tube (hard neutral glass, with an outer diameter of 3.33 mm and an inner diameter of 2.69 mm, purchased from Beijing Aote Glass Tube Research Institute) and a gre...

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Abstract

The invention discloses a coaxial compound oxygen microelectrode and a preparation method thereof. The oxygen microelectrode includes an external casing, a working cathode column located at the central part, and a reference electrode located between the external casing and the working cathode column, the central part of the working cathode column is provided with a platinum wire, an electrolyte solution is filled between the external casing and the working cathode column, the outer wall of the working cathode column or the inner wall of the external casing is plated with a layer of silver layer, and the upper end surface of the silver layer is welded with a conductive metal wire to form a protection cathode. The electrode making process is simple, and high in control success rate, the results show that the protection cathode switches on to reduce residual current of the coaxial compound oxygen microelectrode by about 80%, dissolved oxygen response linear dependence R2 is more than 0.99, and the dissolved oxygen resolution is about 0.03 mg O2 / L.

Description

technical field [0001] The invention relates to a microelectrode and a preparation method thereof, in particular to a coaxial composite oxygen microelectrode and a preparation method thereof. Background technique [0002] Oxygen microelectrode is the most mature electrode so far, and it can be divided into composite type and separated type from the structure. The separated oxygen microelectrode has a simple structure, usually a glass capillary wrapped with a platinum wire or a low melting point alloy, and the tip is plated with gold. Since the linear expansion coefficients of general glass capillary and platinum wire are different, the process of directly wrapping platinum wire is not easy, and cracks often appear between the two, which affects the performance of the electrode. The most common method of split oxygen microelectrodes is to pour low-melting point alloys into glass blanks, and then plate gold or platinum on the tip of the electrodes to act as an oxygen reductio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
Inventor 周小红施汉昌
Owner TSINGHUA UNIV
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