Patent ID: 8552730

Claim:
A pH sensing apparatus comprising: a flexible polymer substrate; one or more amorphous iridium oxide film sensor electrodes disposed on the flexible polymer substrate; a reference electrode corresponding to each amorphous iridium oxide film sensor electrode, wherein each reference electrode is disposed on the flexible polymer substrate in close proximity to the corresponding amorphous iridium oxide film sensor electrode; a first electrical contact pad corresponding to each amorphous iridium oxide film sensor electrode, wherein each first electrical contact is disposed on the flexible polymer substrate and electrically connected to the corresponding amorphous iridium oxide sensor; a second electrical contact pad corresponding to each reference electrode, where each second electrical contact pad is disposed on the flexible polymer substrate and electrically connected to the corresponding reference electrode; and wherein the amorphous iridium oxide film sensor electrodes provide a potential in reference to the reference electrodes that varies according to a pH of a substance contacting the amorphous iridium oxide film sensor electrodes and the reference electrodes.