Preparation and hydrogen gas sensitive characteristics of highly ordered titania nanotube arrays

In this paper, we report the growth and characteristics of titania nanotube arrays prepared by anodic oxidation and then annealed in an oxygen atmosphere at 500°C. The titania nanotube arrays presented high sensitivity to hydrogen gas. The crystalline phase of the samples was checked by X-ray diffraction (XRD). The differences in the nanotubes morphology attributed to the etched samples due to anodization potential, reaction time and the electrolyte concentration were analyzed by scanning electron microscopy (SEM). The gas sensitive parameters of the samples were obtained from resistance, the response time and the recovery time at different temperatures.