The interaction mechanism of cesium with water on the SrTiO3(100) surface at room temperature

Abstract The interaction of water with cesium on the strontium titanate surface SrTiO 3 (100), was studied, mainly by means work function measurements and thermal desorption spectroscopy. catalytic role respect to dissociation investigated, applying two different adsorption processes at room temperature (RT): (1) covered (sequential adsorption), (2) co-adsorption process (simultaneous adsorption) surface. Based results adopting Lewis acid–base model, we conclude that during sequential molecules are mostly adsorbs non-dissociatively surface, without oxidizing alkaline overlayer. This seems be due, first strong between adatoms substrate, secondly limited maximum pre-deposited amount (≤ 0.45 ML). Instead, appears merely occur defective sites substrate in accordance previous studies. For a full layer adsorbed retracts metallicity due electrostatic interactions. In contrast adsorption, oxidation takes place above critical coverage (≥ It co-adsorbed modifies potential providing an effective template for oxide, Cs 2 O development. that, suggest reaction according Langmuir–Hinshelwood mechanism. Finally, propose atomistic models both adsorption.