Hydrogen sensing performance of TiO2 nanotubes at room temperature

We report the hydrogen sensing properties of a sensor using TiO₂ nanotube arrays. The TiO₂ nanotube arrays were fabricated by anodization on titanium foil, in an electrolyte containing 0.5 wt% hydrofluoric acid mixed with water, the electric potential being 15V. TiO₂ nanotube arrays were annealed at 600 Celsius for 1 h. The sensors were equipped with platinum electrodes. These two were connected with a metal wire using silver paste. The measurements of the sensor´s electrical resistance were performed in NTP. The hydrogen sensor using TiO₂ nanotube arrays shows a linear sensitivity with various hydrogen concentrations. After repeating exposure to hydrogen at room temperature, the sensor´s resistance indicated a stable recovery to its initial resistance. The reproducibility of this exam is reliable.