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Water Ordering on the Magnetite Fe3O4 Surfaces
Eman Zaki1, Zdenek Jakub2, Francesca Mirabella1,2
1Abteilung Chemische Physik , Fritz-Haber-Institut der Max-Planck-Gesellschaft , Faradayweg 4-6 , 14195 Berlin , Germany.
The Journal of Physical Chemistry Letters
|May 2, 2019
Summary
Water interaction with iron oxide surfaces (Fe3O4) differs significantly between the (001) and (111) facets. Surface structure and water-water interactions dictate stable ice-like formations on these prominent iron oxide surfaces.
Area of Science:
- Surface science
- Materials science
- Physical chemistry
Background:
- Understanding water-surface interactions is crucial for various applications.
- Iron oxide (Fe3O4) is a prominent material with diverse surface properties.
- The distinct crystallographic facets of Fe3O4 exhibit unique characteristics.
Purpose of the Study:
- To compare the adsorption and structural behavior of water on Fe3O4(001) and Fe3O4(111) surfaces.
- To investigate the influence of surface reconstruction on water adsorption.
- To elucidate the role of water-water interactions in layer formation.
Main Methods:
- Utilized temperature-programmed desorption (TPD).
- Employed temperature-programmed low energy electron diffraction (TP-LEED).
- Applied scanning probe microscopies (SPM).
Main Results:
- Water adsorption on Fe3O4(001) is strongly influenced by its (√2 × √2)R45° reconstruction.
- A (2 × 2) superstructure forms on Fe3O4(001) near monolayer completion.
- A similar (2 × 2) superstructure on Fe3O4(111) appears over a wider range of conditions.
- Long-range order indicates significant water-water interactions before second layer nucleation.
Conclusions:
- Surface reconstruction significantly impacts water adsorption structures.
- Water-water interactions play a key role in pre-nucleation ordering.
- Fe3O4(111) facilitates more stable hexagonal ice-like structures due to its smaller unit cell and hexagonal substrate compatibility.
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