ZnO Nanostructure-Based Amperometric Biosensors

Abstract

ZnO pure thin films were prepared using the thermal chemical spray pyrolysis technique on glass substrates preheated at (450 o C) with a spray rate of 2–3 mL /min, for obtaining thicknesses of (150 nm). The investigation by XRD   indicates   that   the   (ZnO)   films   are a polycrystalline type with Wurtzite structure. The surface morphology of the prepared  films  were  studied by SEM, showing that  the surface of the ZnO thin films are smoother and the average grain size is less than 50 nm. The sensitivity behaviours of ZnO based on the amperometric biosensor to CaSO4.2H 2 O salt were investigated at 250 o C with different salts concentrations, the resistance of the film increased with increasing of concentration.