Structural Characterization of Mn3O4(001) Thin Films and Their Interaction with CO

Barreto J, Fickenscher G, Hohner C, Ramos MI, Annese E, Archanjo B, Achete CA, Libuda J, Stavale F (2024)


Publication Type: Journal article

Publication year: 2024

Journal

DOI: 10.1021/acs.jpcc.4c03828

Abstract

In this study, we investigated the atomic-level interaction between CO molecules and a well-ordered Mn3O4(001) thin film. The oxide film, initially grown on a single-crystal Au(111) substrate, was characterized using X-ray photoelectron spectroscopy (XPS) to determine its oxidation state. Further examination of the film structure through scanning transmission electron microscopy (STEM) and low-energy electron diffraction (LEED) revealed its growth orientation along the [001] direction, with three domains rotated by 60° and aligned with the ⟨110⟩Au directions. Notably, the termination of the film features a layer of Mn3+ cations covered with oxygen atoms. The study then focused on the interaction of the film with CO, employing infrared reflection absorption spectroscopy (IRAS) and temperature-programmed IRAS (TP-IRAS). The results unveiled two distinct IR peaks related to CO adsorption: one at 2140 cm-1, signifying that CO molecules weakly adsorbed on the oxygen-terminated surface of Mn3+ cations, and another at 2105 cm-1, indicative of CO molecules bound to Mn2+ cations at oxygen vacancies.

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APA:

Barreto, J., Fickenscher, G., Hohner, C., Ramos, M.I., Annese, E., Archanjo, B.,... Stavale, F. (2024). Structural Characterization of Mn3O4(001) Thin Films and Their Interaction with CO. Journal of Physical Chemistry C. https://doi.org/10.1021/acs.jpcc.4c03828

MLA:

Barreto, Jade, et al. "Structural Characterization of Mn3O4(001) Thin Films and Their Interaction with CO." Journal of Physical Chemistry C (2024).

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