An interdigitated microelectrode (2) comprising a substrate (4), a first layer (6) of a first metal on the substrate (4), and a second layer (8) of a second metal on the substrate (4), the first layer (6) comprising a plurality of line microelectrodes (10) which are connected at a first end (12) and are not connected at a second end (14), the second layer (8) comprising a plurality of line microelectrodes (16) which are connected at a first end (18) and are not connected at a second end (20), the line microelectrodes (10) of the first layer (6) and the line microelectrodes (16) of the second layer (8) being such that they extend into each other but do not touch each other thereby to form an interdigititated microelectrode array (22), and the first metal being different from the second metal. A process for producing the interdigitated microelectrode (2) is also disclosed.
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