Novel carbon fiber microelectrode and preparation method thereof

Abstract

The invention belongs to the technical field of microelectrode preparation and relates to a novel carbon fiber microelectrode and a preparation method thereof. The novel carbon fiber microelectrode comprises carbon fiber wires and copper wires. One end of the carbon fiber wire and one end of the copper wire are connected and cured by a conductive adhesive. The cured carbon fiber wire-copper wire is sleeved by a glass capillary with a tip at one end. The thick end of the glass capillary and the copper wire are fixed through a short wax column. The gap between the tip end of the glass capillaryand the carbon fiber wire are sealed through a short wax column. Wax oil is used as a simple and efficient sealant. The carbon fiber microelectrode with good electrochemical performances can be prepared without a complicated instrument. The novel carbon fiber microelectrode has the characteristics of good sealing effects, high yield, no pollution, good electrochemical performance, etc. The carbonfiber microelectrode has no pollution to an analysis sample, good stability and high reproducibility, utilizes cheap and easily available raw materials, is prepared through simple processes and is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of microelectrode preparation, and relates to a novel carbon fiber microelectrode and a preparation method thereof. Background technique [0002] Ultrafine electrodes refer to electrodes with a size in the μm or nanometer range. When the one-dimensional size of the electrode is reduced from millimeters to μm, it exhibits many excellent electrochemical properties and is theoretically more suitable for electrochemistry than conventional electrodes. Thermodynamic and kinetic studies of chemical reaction processes. Due to its small size, it can be inserted into the cells of living tissue to measure the relevant components without causing damage, so it has attracted much attention as a special micro biochemical sensor, in the fields of microscopic electrochemical analysis and biological tissue analysis. with broadly application foreground. The diameter of the carbon fiber monofilament is only a few μm, which ca...

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Problems solved by technology

[0003] At present, most of the preparation methods of carbon fiber microelectrodes use epoxy resin insulation method and flame melting method, but these two methods still have shortcomings to a certain extent. Among them, the epoxy resin insulation method has poor sealing and harsh high-temperature curing conditions. Leakage of epoxy resin often occurs, resulting in high noise in the detector, low detection sensitivity, and easy contamination of analysis samples, etc.

The flame melting method is well sealed, and the prepared microelectrode has good electrochemical performance. However, during the 0.2-0.5s burning process of the outer flame of the gas lamp, the carbon fiber is easy to burn and is difficult to control, which greatly reduces the production yield.

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