Fabrication of ultramicroelectrodes using a "teflon-like" coating material.

A new method was developed for the preparation of ultramicroelectrodes (UMEs). In this method, a photo-curable fluorinated functionalized perfluoropolyether, a liquid v-like polymer at room temperature, is used as the material for the insulation of metal microwires or carbon fibers. The UMEs prepared by this method were usually conical shaped and could be used both in aqueous solutions and with aprotic solvents. The relatively small thicknesses of the insulating sheath of the "Teflon-like"UME tips make them particularly useful for scanning electrochemical microscopy measurements.