Copper microwire coated with a thin film of borosilicate glass can be used to provide a new and convenient method for fabricating high quality 7 μm diameter copper microdisk electrodes. The reversible reduction of the cobaltocenium cation to cobaltocene was studied in acetonitrile to assess the quality of electrode fabrication. If electrode polishing followed by potential, wave shape, and limiting current are all as theoretically expected for a reversible steady‐state voltammogram. However, if the nitric acid treatment is believed to remove a thin film of copper oxide which acts as an insulator with respect to the reduction of the cobaltocenium caton and, therefore, effectively decreases the electrode area. Studies on glycine which represents an example of a biologically important molecule previously determined by voltammetry at conventionally sized copper electrodes also were undertaken. An extremely well‐defined response is observed for glycine at a copper microelectrode, indicating the analytical usefulness of this new class of microelectrode. Additional aspects of the glycine mechanism which intimately involve the copper electrode surface are elucidated from the microelectrode studies.
- Copper fabrication