INVESTIGATION OF THE PERFORMANCE OF MICROELECTRODES WITH MICROMETER SIZE STRUCTURAL DIAMETERS

A microelectrode was fabricated by coating a silicon dioxide film on t he Pt wire surface. The fabricated electrode was then characterized by scanning electron micrographs, energy spectrum, cyclic voltammetry, d ifferential pulse voltammetry and AC impedance spectroscopy. A well-de fined sigmoidal response for reduction of potassium ferricyanide showe d that the electrode has a high mass transport rate, which is the feat ure of the microelectrode. The micrometer scale size permits it to be used in vivo, and the absence of epoxy resin (as insulator material) a lso makes the presented microdisk electrode suitable for electroanalys is in nonaqueous media.