The growth and structure of two-dimensional iron silicate and iron germanate films on Ru(0001) are studied. We investigate in detail the temperature-dependent film formation of ultrathin layers of iron silicate and iron germanate. These two-dimensional films can be seen as model systems for more complex catalytically active structures, such as zeolites, which can be used as selective catalysts or molecular sieves. The experimental methods of XPS, LEED, LEEM, LEEM-IV, and XPEEM are applied for correlated chemical and physical characterization in situ and in real time, and DFT is applied for theoretical consideration. We show that both systems can be considered as two-layered systems, with a monolayer of iron oxide at the Ru interface and a monolayer of silica or germania on top, respectively. The Fe-Fe distance in the iron oxide layer is influenced by the Si-O-Si or Ge-O-Ge bond length, in agreement with those of unstrained silicates or germanates. Moreover, iron silicate can be prepared using different preparation methods. The actual loading of Fe atoms is three per unit cell for FeGeOx and only two for FeSiOx

Peschel, G., Fuhrich, A., Menzel, D., Varjovi, M., Tosoni, S., Freund, H. (2024). Growth and Structure of Ultrathin Iron Silicate and Iron Germanate Films. JOURNAL OF PHYSICAL CHEMISTRY. C, 128(45), 19423-19435 [10.1021/acs.jpcc.4c05601].

Growth and Structure of Ultrathin Iron Silicate and Iron Germanate Films

Varjovi M. J.;Tosoni S.;
2024

Abstract

The growth and structure of two-dimensional iron silicate and iron germanate films on Ru(0001) are studied. We investigate in detail the temperature-dependent film formation of ultrathin layers of iron silicate and iron germanate. These two-dimensional films can be seen as model systems for more complex catalytically active structures, such as zeolites, which can be used as selective catalysts or molecular sieves. The experimental methods of XPS, LEED, LEEM, LEEM-IV, and XPEEM are applied for correlated chemical and physical characterization in situ and in real time, and DFT is applied for theoretical consideration. We show that both systems can be considered as two-layered systems, with a monolayer of iron oxide at the Ru interface and a monolayer of silica or germania on top, respectively. The Fe-Fe distance in the iron oxide layer is influenced by the Si-O-Si or Ge-O-Ge bond length, in agreement with those of unstrained silicates or germanates. Moreover, iron silicate can be prepared using different preparation methods. The actual loading of Fe atoms is three per unit cell for FeGeOx and only two for FeSiOx
Articolo in rivista - Articolo scientifico
Oxide Thin Films, Iron Silicates, Iron Germanates, 2D Zeolites, DFT, STM, XPS
English
31-ott-2024
2024
128
45
19423
19435
open
Peschel, G., Fuhrich, A., Menzel, D., Varjovi, M., Tosoni, S., Freund, H. (2024). Growth and Structure of Ultrathin Iron Silicate and Iron Germanate Films. JOURNAL OF PHYSICAL CHEMISTRY. C, 128(45), 19423-19435 [10.1021/acs.jpcc.4c05601].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/544741
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