Formation of a faceted MoO2 epilayer on Mo(112) studied by XPS, UPS and STM

Schroeder, Thomas; Zegenhagen, Jörg; Magg, Norbert; Immaraporn, Boonchuan; Freund, Hans-Joachim

doi:10.1016/j.susc.2004.01.010

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Formation of a faceted MoO₂ epilayer on Mo(112) studied by XPS, UPS and STM

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Magg, Norbert
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Immaraporn, Boonchuan
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund, Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Schroeder, T., Zegenhagen, J., Magg, N., Immaraporn, B., & Freund, H.-J. (2004). Formation of a faceted MoO₂ epilayer on Mo(112) studied by XPS, UPS and STM. Surface Science, 552(1-3), 85-97. doi:10.1016/j.susc.2004.01.010.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-0D27-5

Abstract

The open trough and row Mo(112) surface serves as substrate for the epitaxial growth of MoO2. XPS, UPS and STM studies of the oxygen adsorption allow to monitor step-by-step the transformation of the electronic and morphological properties during this process. XPS and UPS spectra reveal that a stable oxygen chemisorbed state precedes the formation of MoO2. STM topographs identify this oxygen chemisorbed phase as an oxygen-induced p(2x3) reconstruction of the missing row type. This precursor state evolves into a flat p(1x3) reconstructed (010) MoO2 layer which roughens by the formation of (110) facets under further oxygen exposure.