1. Water reaction on SrTiO3(0 0 1): promotion effect due to condensation
- Author
-
Hiroyuki S. Kato, Masashi Nantoh, Maki Kawai, and Susumu Shiraki
- Subjects
Range (particle radiation) ,Chemistry ,Inorganic chemistry ,Condensation ,Promotion effect ,Analytical chemistry ,Surfaces and Interfaces ,Partial pressure ,Condensed Matter Physics ,Surfaces, Coatings and Films ,Scanning probe microscopy ,Materials Chemistry ,Molecule ,Reactivity (chemistry) ,Layer (electronics) - 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.
- Published
- 2003