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Hydrogen sensors, intending to operate at low temperatures (around 25°C), based on TiO2 nanotube arrays were fabricated and characterized in N2/H2 atmosphere with different nitrogen concentrations. The nanotube arrays were obtained through Ti anodic oxidation in a NH4F in ethylene glycol (0, 5 % in weight) and 2 % H2O bath, magnetically stirred at room temperature. The TiO2 nanotube hydrogen sensors...