Water reaction on SrTiO3(0 0 1): Promotion effect due to condensation

Hiroyuki S. Kato, Susumu Shiraki, Masashi Nantoh, Maki Kawai

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    Reactivity of water molecules on atomically flat SrTiO3(00 1) surfaces was investigated with a wide range of the water partial pressure from 10-4 to 103 Pa, by means of scanning probe microscopy (SPM) at room temperature. The reactivity on SrTiO3(00 1) was observed by monitoring the microscopic friction contrast reflecting SrO and TiO2 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 103 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 SrTiO3(0 0 1) is promoted by the condensation, and propose possible promotion mechanisms relating to the condensed water properties.

    Original languageEnglish
    Pages (from-to)L722-L728
    JournalSurface Science
    Volume544
    Issue number2-3
    DOIs
    Publication statusPublished - 2003 Oct 20

    Keywords

    • Atomic force microscopy
    • Low index single crystal surfaces
    • Solid-liquid interfaces
    • Surface chemical reaction
    • Water

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Materials Chemistry

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