Microring electrode and production method thereof

Abstract

The invention discloses a gold film material-based microring electrode and a production method thereof. The method comprises the following steps: self-assembling a polydopamine layer on the inner wall of a hydroxylated capillary tube, self-assembling a single layer of gold or platinum nanoparticles through using electrostatic effect, Van der Waals force and hydrogen bond between amino and hydroxy groups and nanogold, and introducing a chemical plating solution containing auric chloride acid and hydroxylamine hydrochloride into the tube to grow the gold or platinum film. The method for producing the gold film or platinum film microelectrode is simple, is easy to operate, and allows the uniform thickness-controllable gold film or platinum film to be formed on the inner wall of a glass or quartz tube. The single microelectrode produced through the method can be potentially applied to release analysis of in vivo in-situ or cell surface chemical substances.

Description

technical field [0001] The invention belongs to the field of microelectrode preparation, and relates to a microring electrode and a preparation method thereof. Background technique [0002] Ultramicroelectrode, also known as microelectrode, refers to a type of electrode whose one-dimensional size is micron or nanoscale (usually at least one dimension is less than 25 microns), which was introduced into the field of electroanalytical chemistry by Wightman and Fleischmann et al.[ Wightman R M, Microvoltammetric Electrodes [J]. Anal. Chem. 1981, 53 (9): 1125A-1134A; Fleischmann M, Pons S. The Behavior of Microelectrodes [J]. Anal. Chem., 1987, 59 (24): 1391A-1399A]. Microelectrode has characteristics that cannot be compared with conventional electrodes, such as small charging current, fast mass rate, high electron transport rate, small RC constant, small ohmic drop, and high signal-to-noise ratio, so it can meet the requirements of electrochemical analysis in special occasiona...

AI Technical Summary

Problems solved by technology

Noble metal ultra-micro electrodes can be used in research in many fields such as chemical analysis, environmental science, and biomedicine. However, due to its difficulty in preparation, especially the preparation of electrodes with a tip of only a few microns or submicrons, there are not many reports on the preparation of electrodes, making their research and application difficult. severely restricted

[0003] At present, the preparation of small-sized noble metal microelectrodes is mainly to fix different electrode materials such as gold, platinum, silver, nickel, tungsten and other materials inside the insulating support to form microelectrodes, and then use the plasma bombardment method [Zhang X, Zhang W , Zhou X, et al.Fabrication, characterization, and potential application of carbon fiber cone nanometer-size electrodes[J].Anal.Chem.1996,68(19):3338-3343] or alternating current etching method [Woo D H, Kang H, Park S M, et al.Fabrication of nanoscale gold disk electrodes using ultrashort pulse etching[J].Anal.Chem.2003,75(23):6732-6736] a thicker metal wire (such as tens Micron diameter) "cut off" a part to become a micro- or nano-scale microelectrode, this "top-down" preparation method requires special equipment and devices, and at the same time only disc-shaped microelectrodes can be obtained.

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