A new form of nanosized SrTiO 3 semiconducting oxide material with an average crystal grain size of 27 nm has been synthesized using the physical high-energy ball milling technique. The unique presence of the singly charged “O - ” ions in the lattice oxygen sites of the nano-range crystal grain material has been observed in the XPS study. This unprecedented and interesting discovery has expounded on the new oxygen sensing mechanism for the near 1 / 2 slope gradient (the best value ever reported) in the logarithmic relationship of the electrical conductance with the oxygen partial pressure. The derived SrTiO 3 oxygen gas sensors were found to operate at 40 °C (the lowest temperature ever reported for an SrTiO 3 -based sensor) that is near to the human body temperature.
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Hu et al. (2004) studied this question.
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