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

Journal of Physical Chemistry C American Chemical Society

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.

Authors with CRIS profile

Georg Fickenscher Lehrstuhl für Katalytische Grenzflächenforschung Chantal Hohner Lehrstuhl für Katalytische Grenzflächenforschung Jörg Libuda Lehrstuhl für Katalytische Grenzflächenforschung

Involved external institutions

Brazilian Center for Physics Research / Centro Brasileiro de Pesquisas Físicas (CBPF) BR Brazil (BR)

How to cite

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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