Biosensor for point-of-care diagnostic and on-site measurements

Disclosed herein is a biosensor for detection of a target substance in a sample with impedance spectroscopy, the biosensor comprising 1) a first non-conducting substrate comprising a primary substrate surface; 2) a conducting polymer electrode layer comprising one or more conducting polymers layers, the conducting polymer electrode layer comprising a primary electrode surface and a secondary electrode surface, wherein the secondary electrode surface covers part of the primary substrate surface; 3) a probe layer bonded to part of the primary electrode surface; and 4) a second non-conducting substrate comprising a secondary substrate surface, wherein the secondary substrate surface of the second substrate and the primary substrate surface of the first substrate are interconnected such that the electrode layer and the probe layer are confined within an area defined by the first substrate and the second substrate; wherein the electrode layer comprises at least a first electrode pair, the first electrode pair comprising a primary electrode and a secondary electrode, where the probe layer is bonded to the primary electrode and the secondary electrode of the at least first electrode pair, the probe layer being adapted for selectively binding of the target substance.