Abstract
The recent trend in gas sensor research is to achieve higher gas sensitivity and shorter response time at low operating temperatures. In the present study, titanium dioxide was studied as an oxygen gas sensor at different chromium (Cr) dopant concentrations. The sensitivity and response time measurements were carried out as a function of operating temperature and oxygen partial pressure. A higher sensitivity and shorter response time was observed at 700 °C in 0.40 wt % Cr doped sensor as compared to an undoped sensor, which showed higher sensitivity at 800 °C. The 0.40 wt % Cr doped sensor shows 13 times higher sensitivity as compared to undoped sensor. The porosity of the material decreases as Cr concentration increases. A large number of operation cycles were performed on the sensor, which shows the stability of the device over long period. The sensitivity and response time of the sensor were also correlated with electronic structure results obtained from x-ray photoelectron spectroscopy.
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