Beschreibung
Iron oxides are used in a wide range of applications in which their surfaces interact with water. Recent studies have found significant complexity with mixed-mode adsorption and coverage dependent hydrogen bonding. This study focuses on Fe3O4(001) and its interaction with water. Temperature programmed desorption (TPD) and non-contact atomic force microscopy (ncAFM) are ombined with density functional theory (DFT) based calculations.Quantitative TPD spectra reveals 4 distinct peaks for the desorption of the first monolayer of water, suggesting that stable configurations of water exist. Surfaces with the in the TPD relevant water coverages were prepared and studied in a CO functionalised tip ncAFM experiment. These results will be presented in a previous talk.
DFT predicts partially dissociated dimers and trimers located on Fe cations to be found to be the most stable configurations, in-line with the known concept of cooperativity. The ring-like networks observed in ncAFM, correspond to merged trimers which are connected via additional hydrogen bonded water molecules. The formation of these features is motivated by optimizing available hydrogen bonds.
| Zeitraum | 14 März 2018 |
|---|---|
| Ereignistitel | DPG-Frühjahrstagung und EPS-CMD27 |
| Veranstaltungstyp | Konferenz |
| Ort | Berlin, DeutschlandAuf Karte anzeigen |
| Bekanntheitsgrad | International |