Datensatz

Zusammenfassung

D₂O adsorption to well-ordered Cu₂O(111) thin films has been explored with scanning tunneling microscopy, thermal desorption and infrared absorption spectroscopy. The molecules bind associatively to the oxide surface, whereby the first D₂O layer experiences slightly stronger adhesion due to interfacial hydrogen bonds. At higher coverage, amorphous solid water (ASW) films condense on the Cu₂O(111) surface, as concluded from a dominant 155 K desorption peak and a broad vibrational band centered at 2540 cm^–1. Development of ASW is also observed on bare Au(111), being used as substrate for Cu₂O growth. In contrast to the oxide surface, no binding enhancement is detected for the D₂O monolayer and desorption is accompanied by dewetting and transformation to crystalline ice. The different binding schemes of water reflect the hydrophilic versus hydrophobic character of Cu₂O(111) and Au(111) supports, respectively.