Conical ultramicroelectrodes

Figure 6.13.1 Different shapes of ultramicroelectrodes (UMEs). (A) A perfect microdisk electrode. (B) A conical disk-type planar UME due to sealing of the tnicrowire at an angle relative to the insulating shroud. (C) An irregular cylindrical protruding from the insulator. (D) A recessed microdisk electrode. (E) A recessed electrode in which the cavity in the insulator is large than the...

Conical-shaped ultramicroelectrodes (UMEs) are of special interest in connection with the imaging of surfaces, in kinetic studies, in probing thin films, and in probing minute environments, such as single cells. The most common fabrication procedure is by the etching of platinum wire or carbon fibers followed by coating with an insulating material except at the apex of the electrode. In this section, the fabrication of both blunt and sharp conical electrodes are discussed. 

Britz D, Strutwolf J (2006) Electroanalytical response of an ultramicroelectrode at the bottom of an insulating conical well digital simulation. Electrochim Acta 52 33 1... 

Penner, R. M., Hehen, M. J., Lewis, N. S. Preparation and electrochemical characterization of conical and hemispherical ultramicroelectrodes, Anal. Chem. 1989, 61, 1630-1636. 

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