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Abstract
Purely amorphous germania bilayer films are grown on a reconstructed Au(111) surface. The presence of the film affects the native configuration of the Au soliton walls, as observed with scanning tunneling microscopy. They partly avoid the film islands, and partly penetrate under film patches. This behavior indicates a weaker film-substrate interaction than the one reported for other oxide films on reconstructed Au(111). Moreover, this new system highlights the impact of the metal support on the structure of ultrathin films of germania: With decreasing film-substrate interaction the amorphous phase is promoted. Density functional theory calculations confirm and rationalize the experimental observations. This work provides a useful generalization of the relationship between film structure and adhesion energy.
Highlights
Amorphous germania bilayer films are grown on a reconstructed Au(111) surface
The soliton walls that separate both domains are typically seen with a scanning tunneling microscope (STM) as bright parallel paired rows, as shown in Fig. 2(a) [6,7]
As the STM can sense any perturbation in the herringbone reconstruction, many organic-metal interface studies have been carried out on reconstructed Au(111)
Summary
The main reason for that is its combination of interesting properties ruled by its chemical inertness, high electronegativity, and large reconstructio√n Concerning the latter, the surface reconstructs with a (22 × 3) periodicity with the presence of an additional gold atom in the [110] direction of the topmost layer [1,2,3,4]. In the field of ultrathin oxide films, Au(111) represents an interesting metal substrate [30] Oxide films, such as MgO [31], TiO2 [32,33], ZnO [34], and MoO3 [35] lift the herringbone reconstruction. The strength of the film-substrate interaction is qualitatively estimated from the change of the herringbone reconstruction observed in STM and quantitatively determined by density functional theory (DFT) calculations.
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