Principle of microelectrochemical measurements

A new electrochemical technique with a current detection limit of <10 fA enables investigations in the micrometer range [6].

Fig. 2. Schematic of microeiectrochemical measurements on inhomogeneous substrates using various capillary sizes.

The use of an electrochemical microcell allows to reduce the size of the exposed surface area (Fig. 2).

Small-area measurements have two great advantages:

(1) The electrochemical background noise is considerably reduced. Therefore.pro-cesses and can be detected which otherwise would not be seen within the noise spectrum [7, 8].

(2) The reduction of the sample area enables the study of single heterogeneities.

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