Growth of epitaxial thin Pd(111) films on Pt(111) and oxygen-terminated FeO(111) surfaces

Growth of cobalt on a VO(111) surface: Template, surfactant or encapsulant role of the oxide nanolayer?

“…Recently, a similar behaviour as communicated here has been reported for a Pd film deposited on a structurally similar FeO monolayer supported on Pt(1 1 1) [13,14], where the annealing in UHV causes the diffusion of the Pd film underneath the FeO(1 1 1) layer. These findings together with the results of the present study suggest that the encapsulation of metal films by a supporting ultrathin oxide layer is a more general phenomenon, with important consequences for the use of oxide nanolayers, which goes far beyond their traditional use as templates for metal particles growth.…”

“…For Pd deposits on FeO(1 1 1), in contrast, a wetting behaviour of the metal overlayer has been reported by STM experiments [12], which has been attributed to the strong interaction between Pd and the FeO(1 1 1) film. However, subsequent studies [13,14] have shown that there is a substantial diffusion of Pd through the oxide overlayer, towards the underlying metaloxide interface, implying that the STM images originally assigned to two-dimensional Pd islands in Ref. [12] corresponded instead to an encapsulating FeO layer.…”

Reactivity of FeO(111)/Pt(111) with Alcohols

“…29, 30 The FeO(111) prepared by the above procedure was found to show a single, well-defined Kr desorption peak as observed in our previous studies. 31 The FeO(111) thin film is stable upon heating to 1100 K but can be completely removed by annealing to 1300 K.…”

“…We have employed this technique previously to follow dewetting of Pd overlayers from FeO(111) and the growth of water films on FeO(111). 22,31 Kr TPD spectra obtained after dosing 1 ML of Kr at 30 K on clean Pt(111), 3 ML thick Fe film on Pt(111), and FeO(111) monolayer on Pt(111) are shown in Figure 3 to illustrate the sensitivity of Kr physisorption to the chemical nature of the substrate. 31 The Kr TPD from the Fe film is included to show the spectrum expected after oxygen removal from the FeO(111) during the alcohol adsorption/desorption cycles shown in Figure 2.…”

Low-dimensional oxide nanostructures on metals: Hybrid systems with novel properties

“…141 The observed metal wetting has been attributed to the strong interaction between Pd and the oxide film, which arises in order to reduce the polar character of the FeO͑111͒ surface. However, subsequent studies 142,143 have shown that upon heating in UHV there is a substantial diffusion of Pd through the oxide layer, toward the underlying metal/oxide interface, implying that the STM images originally assigned to two-dimensional Pd islands in Ref. 141 correspond instead to an encapsulating FeO layer.…”