A device for detecting cells and/or molecules on an electrode surface is
disclosed. The device detects cells and/or molecules through measurement
of impedence changes resulting from the cells and/or molecules. A
disclosed embodiment of the device includes a substrate having two
opposing ends along a longitudinal axis. A plurality of electrode arrays
are positioned on the substrate. Each electrode array includes at least
two electrodes, and each electrode is separated from at least one
adjacent electrode in the electrode array by an expanse of non-conductive
material. The electrode has a width at its widest point of more than
about 1.5 and less than about 10 times the width of the expanse of
non-conductive material. The device also includes electrically conductive
traces extending substantially longitudinally to one of the two opposing
ends of the substrate without intersecting another trace. Each trace is
in electrical communication with at least one of the electrode arrays.