Abstract
Reactivity of water molecules on atomically flat SrTiO 3(0 0 1) surfaces was investigated with a wide range of the water partial pressure from 10 −4 to 10 3 Pa, by means of scanning probe microscopy (SPM) at room temperature. The reactivity on SrTiO 3(0 0 1) was observed by monitoring the microscopic friction contrast reflecting SrO and TiO 2 terraces, since the contrast is enhanced by a preferential water reaction on the SrO terraces. The remarkable enhancement of the water reactivity was observed at the partial pressure of 10 3 Pa. A simple estimation revealed that, at this pressure, a condensed water layer is formed on the surface, which was confirmed by the temperature dependence measurements. We conclude that the water reaction on SrTiO 3(0 0 1) is promoted by the condensation, and propose possible promotion mechanisms relating to the condensed water properties.
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