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The biosensors on basis of the pH sensor are widely utilized in the medical instruments.Zinc oxide (ZnO) has been demonstrated as a promising sensing material due to its inherent properties including wide bandgap (3.3 eV), stability, low toxicity, biocompatibility,high electron mobility and easy fabrication.In this work,ZnO nanorod (NR) arrays was deposited on the FTO glass through hydrothermal reaction.