Effect of the dimensions of titanium oxide nanotubes, synthesized via anodic oxidation, on hydrogen gas detection by this nanostructure

The electrical resistance of metal oxide semiconductor thin films varies with the composition of their surrounding gas. Titanium oxide nanotubes are sensitive to hydrogen gas and their electrical resistance are drastically decreased in hydrogen gas exposure. In this study, titanium oxide nanotubes were synthesized on a titanium foil by anodic oxidation method. Two types of electrolytes, containing aqueous and organic electrolytes, were used to obtain nanotube arrays with differentgeometries. The results demonstrated that the nanotube arrays with narrower wall thickness and shorter length were moresuitable choices for hydrogen gas detection and sensing by this nanoarchitecture. In this work, surface morphology was studied by field emission scanning electron microscopy (FESEM). Also, structural changes were evaluated by X-ray diffraction (XRD) analysis.