Abstract
In the present work, Ni-doped TiO2 nanorods were fabricated on indium tin oxide (ITO) coated glass substrate by a novel spray pyrolysis deposition route. The influence of pyrolytic temperature on the degree of crystallinity of the Ni:TiO2 films was clearly reflected in the X-ray diffractograms. The promoting effect of ITO seed layer on Ni:TiO2 film was reflected in the film prepared at 300 °C which show predominantly a (101) orientation corresponding to the c-axis of pure tetragonal anatase TiO2. The evaluated optical band gap (Eg) of the films prepared at different temperature was in the range of 3.3–3.62 eV. The high Eg values confirmed the existence of TiO2–Ni catalyst influence interaction. The morphology of the film optimized at 300 °C was almost rod shaped with large roughness favorable for sensing. The hydrogen sensing properties of the Ni:TiO2 nanorod sensor was investigated. The Ni doped TiO2 films exhibited a different p-type response to H2. It was found that the sensor based on Ni:TiO2 nanorod structure optimized at 300 °C exhibited good performance even at room temperature.
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