TiO₂ nanotube arrays via electrochemical anodic oxidation: Prospective electrode for sensing phenyl hydrazine

The TiO₂ nanotube (NT) arrays were grown on Ti foil substrate by electrochemical anodic oxidation and utilized as working electrode to fabricate a highly sensitive and reproducible chemical sensor for the detection of harmful phenyl hydrazine chemical. The fabricated chemical sensor based on TiO₂ NT arrays electrode exhibited high sensitivity of ∼40.9μA mM^-1 cm^-2 and detection limit of ∼0.22 μM with short response time (10 s). The enhanced sensing properties were attributed to the presence of depleted oxygen layer on the surface of grown TiO₂ NT arrays and its high electron transfer process via good electrocatalytic activity towards phenyl hydrazine chemical.