Preparation method of integrated microarray electrode

Abstract

The invention provides a preparation method of an integrated microarray electrode, which comprises the following steps: inserting a first electrode material into glass capillaries to obtain first glass capillaries; sealing a second electrode material to one end of a first thin glass tube by fusing, adding a first conducting medium from the other end, and sealing by connecting with a first wire to obtain a reference electrode and counter electrode; and inserting the reference electrode and counter electrode and the first glass capillaries into a glass tube, filling a glass product in the gap, filling a second conducting medium, and sealing by connecting with a second wire to obtain the integrated microarray electrode. Compared with the prior art, the glass-tube-packagedd integrated microarray electrode is integrated and convenient to use, and has fixed electrode gap and small sample batch detection test errors; and by adopting glass tube packaging, the prepared microarray electrode has the advantages of high corrosion resistance, high stain resistance and favorable stability. The reference electrode and counter electrode is integrated, and thus, the integrated microarray electrode is simple to manufacture and convenient to maintain.

Description

technical field [0001] The invention belongs to the technical field of microelectrodes, in particular to a preparation method of an integrated microarray electrode. Background technique [0002] A microelectrode refers to an electrode smaller than 25 μm in at least one dimension, which is called the critical dimension. Electrodes with critical dimensions as small as 0.1 μm can now be prepared, and electrodes with even smaller critical dimensions are usually called nanoelectrodes. Due to the nature of the micro-electrode, the electrode only needs to be small enough in one dimension, so the micro-electrode can have many shapes: the most common is the micro-disk electrode, which is obtained by sealing a metal wire in an insulator. Disc-shaped microelectrodes; in addition, there are microstrip electrodes, which are obtained by sealing metal foil in an insulator; microcylindrical electrodes, obtained by simply exposing one end of a metal wire or carbon fiber. [0003] The tiny ...

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Problems solved by technology

[0005] H.X.He (Langmuir16, 2000, 9684) used soft printing template method, H.Kaden (Electrochem. The preparation method requires special precision instruments, the cost is high, it is difficult to prepare in ordinary laboratories, and the electrode wires are randomly distributed, which is easy to cause the capacitance and diffusion overlap between adjacent electrodes, resulting in the electrochemical behavior of the conventional large electrodes. , loses the excellent characteristics of the microelectrode, and the surface is difficult to handle after each test

[0006] The Chinese patent with the publication number CN1544928A discloses a method for preparing microdisk array electrodes, which uses quartz capillary tubes to encapsulate electrode materials to make array electrodes, but the cured material of this method is epoxy resin, which can also be used to make gold microarray electrodes, but the electrode electrodes Easy to pollute, limiting its scope of application

[0007] At present, the three-electrode system is generally composed of dispersed working electrodes, reference electrodes and counter electrodes, which is inconvenient for measurements in frequently moving environments, and the distance between electrodes is not easy to fix, resulting in relatively large errors

One of the recognized silver / silver chloride (Ag / AgCl) reference electrodes is made by placing silver / silver chloride in a glass tube with a ceramic core. Due to the method, this electrode is easy to pollute. And it is not easy to clean; and the direct use of silver wire as a reference electrode has the disadvantage of unstable potential, so that it cannot be accurately measured when using conventional electrochemical methods such as cyclic voltammetry

[0008] The Chinese patent application number ZL03137469.7 discloses a preparation method of a composite microelectrode and the Chinese patent application number ZL03266018.9 discloses a needle-type three-in-one microelectrode. These two patents mention the three-electrode Composite in one, although it has many advantages and a wide range of uses, the three electrodes are simply assembled together without organic fusion

The detection current on the microelectrode is usually at the nA level, and the detection of such a small current has high requirements on the detector. In practical applications, because the current of a single microelectrode is sometimes lower than the lower limit of detection of conventional electrochemical instruments, the application is limited. restricted

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