Preparation method of a gold disc submicron electrode with controllable geometry

Abstract

The invention discloses a preparation method of a gold disc sub-micron electrode with a controllable geometrical shape. The method mainly comprises the following steps: placing a gold wire into a capillary glass tube, the capillary glass tube is firstly refined by use of a laser drawing instrument, then the capillary glass tube is enabled to be completely attached to the gold wire, finally, the capillary glass tube is snapped off, an ultramicroelectrode is obtained, then the tip of the ultramicroelectrode is heated by use of a needle grinding instrument, through controlling the heating process, the diameter of the capillary glass tube and the RG of the electrode are controlled, finally, the cross section of the tip of the ultramicroelectrode is truncated by use of a focusing icon beam electron microscope, and thus the gold disc sub-micron electrode is obtained. The electrode obtained by use of the method has the following advantages: the end surface is flat, the insulation layer is uniform and compact, the sensitivity is high, and the electrochemical performance is excellent. Therefore, the electrode is especially applied to basic electrochemistry, biological electrochemical sensors and scanning probes.

Description

technical field [0001] The invention relates to a preparation method of a gold disc submicron electrode with controllable geometric shape and size, and the disc submicron electrode can be widely used in electrochemical basic kinetics, bioelectrochemistry and ultra-high resolution scanning electrochemical microscopy ( High Solution scanning electrochemical microscopy, HS-SECM) research. Background technique [0002] Compared with the traditional macroscopic electrodes (generally considered to be more than 1 mm in size), ultramicro electrodes with a size of less than 25 microns have a smaller time constant and are easier to reach a steady state because of their different diffusion methods from the larger electrodes. Therefore, ultramicroelectrode electrochemistry is an important direction in the development of electrochemical research in the past 30 years. Compared with spherical, strip or columnar ultramicroelectrodes, disc ultramicroelectrodes are relatively easy to prepare...

AI Technical Summary

Problems solved by technology

[0003] (1) It is difficult to prepare ultramicro electrodes smaller than 5 microns, especially submicron electrodes smaller than 1 micron;

[0004] (2) The surface roughness of the electrode obtained by mechanical or manual polishing is relatively large, and gaps are easily generated between the glass and the gold wire;

[0005] (3) The repeatability is relatively poor, especially the control repeatability of RG

[0007] (1) The size of the electrode is difficult to control. The ultra-micro electrode used directly is pulled off by laser melting, and the surface of the electrode is very uneven;

[0008] (2) The controllability of the RG value is poor, and the mechanical or manual grinding has poor controllability for the appearance and geometry of the micro-nano electrode;

[0009] (3) Due to mechanical or manual grinding, it is easy to generate a gap between the electrode and the glass seal

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