We investigate the oxidation mechanism of the layered model system GeAs. In situ X-ray photoelectron spectroscopy experiments performed by irradiating an individual flake with synchrotron radiation in the presence of oxygen show that while As leaves the GeAs surface upon oxidation, a Ge-rich ultrathin oxide film is being formed in the topmost layer of the flake. We develop a theoretical model that supports the layer-by-layer oxidation of GeAs, with a logarithmic kinetics. Finally, assuming that the activation energy for the oxidation process changes linearly with coverage, we estimate that the activation energy for As oxidation is almost twice that for Ge at room temperature.

Camilli, L., Capista, D., Tomellini, M., Sun, J., Zeller, P., Amati, M., et al. (2022). Formation of a two-dimensional oxide via oxidation of a layered material. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 24(22), 13935-13940 [10.1039/d2cp00863g].

Formation of a two-dimensional oxide via oxidation of a layered material

Camilli L.
;
Tomellini M.;
2022-01-01

Abstract

We investigate the oxidation mechanism of the layered model system GeAs. In situ X-ray photoelectron spectroscopy experiments performed by irradiating an individual flake with synchrotron radiation in the presence of oxygen show that while As leaves the GeAs surface upon oxidation, a Ge-rich ultrathin oxide film is being formed in the topmost layer of the flake. We develop a theoretical model that supports the layer-by-layer oxidation of GeAs, with a logarithmic kinetics. Finally, assuming that the activation energy for the oxidation process changes linearly with coverage, we estimate that the activation energy for As oxidation is almost twice that for Ge at room temperature.
2022
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/03 - FISICA DELLA MATERIA
Settore FIS/01 - FISICA SPERIMENTALE
English
Con Impact Factor ISI
Camilli, L., Capista, D., Tomellini, M., Sun, J., Zeller, P., Amati, M., et al. (2022). Formation of a two-dimensional oxide via oxidation of a layered material. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 24(22), 13935-13940 [10.1039/d2cp00863g].
Camilli, L; Capista, D; Tomellini, M; Sun, J; Zeller, P; Amati, M; Gregoratti, L; Lozzi, L; Passacantando, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/302188
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