Abstract: Electrochemoluminescent detector for analyzing a biochemical or biological substance, comprising at least a cell (11, 12) generating and detecting the electrogenerated chemoluminescence, which includes: at least a working electrode (16, 17) produced on a substrate (20); electric power supply (13) connected to the electrode; a photodiode (14) detecting the light generated by electrochemoluminescence; and a device for measuring the signal delivered by the photodiode. The photodiode (14) is produced by being integrated in the substrate (20). The cell comprises two interdigital working electrodes protected by a passivation layer (18) leaving part of their top surface in contact with outside. An intermediate layer (19) of dielectric material is inserted between the electrodes and the substrate (20).

Abstract: A microsensor for electrochemical measurements allowing the determination of concentration or concentration profile of at least one chemical compound with small size or molecular weight, under organic, inorganic, neutral or ionic form in an aqueous environment. The microsensor comprises an array (15) of microelectrodes (16), assembled on a chip (10) supported by an isolating substrate (7), and linked with at least one conductor protected by an insulating layer to a contact allowing the connection to a measuring apparatus. The said microsensor is totally coated with an hydrophilic gel (25) which is chemically inert with respect to the chemical compound, is hydrated at a level of at least 70 %, and has a thickness superior to 10 times the size of the microelectrodes (16). And an integrated electrochemical microsystem including the microsensor.