Hydrogen sensing properties of doped and undoped TiO2 nanotubes

In this work, we fabricated undoped and doped TiO2 nanotubes for investigating H2 sensor properties of these structures. Ti foil was anodized in an aqueous HF electrolyte (0.5 wt %) to form TiO2 nanotube arrays. Carbon doped TiO2 nanotubes were fabricated by anodization of Ti foil using %0.5 polyvinylalcohol (PVA) in an aqueous HF electrolyte (0.5 wt %). For both doped and undoped TiO2 nanotubes anodization was performed at a constant potential of 20V and at constant temperature of 20 ºC. The two structures were characterized using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), X-ray photoelectron spectroscopy (XPS), and determined the H2 sensing properties at 100 ºC