Interaction of water and carbon monoxide with MnO(001) thin films on Au(111)

Barreto, Jade; Nilius, Niklas; Tissot, Heloise; Shaikhutdinov, Shamil; Freund, Hans Joachim; Stavale, Fernando

doi:10.1039/d3cp04038k

Phys. Chem. Chem. Phys.

2023

DOI: 10.1039/d3cp04038k

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Interaction of water and carbon monoxide with MnO(001) thin films on Au(111)

Jade Barreto,

Niklas Nilius,

Heloise Tissot

et al.

Abstract: Atomically defined MnO(001) thin films were grown on an Au(111) substrate, and their interaction with water (D2O) was investigated by Infrared Reflection Absorption Spectroscopy (IRAS) and Thermal Desorption Spectroscopy (TDS)....

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2024

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Cited by 2 publications

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

Barreto,

Fickenscher,

Hohner

et al. 2024

J. Phys. Chem. C

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

Barreto,

Fickenscher,

Hohner

et al. 2024

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

Insights into the Reactivity of the Mn₃O₄(001) Thin Film with Water

Codeço,

Barreto,

Caetano

et al. 2024

J. Phys. Chem. C

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The correlation between the geometric structure and reactivity of an oxide surface is crucial to designing new catalytic materials. This work uses a wellordered Mn 3 O 4 (001) thin film phase to investigate water-oxide interaction. Based on scanning tunneling microscopy data, we propose that water molecule adsorption occurs at oxygen-defective sites and is followed by water dissociation. The vibrational modes related to the D 2 O (heavy water) physisorbed and the chemisorbed O s D on the surface were identified by infrared reflection absorption spectroscopy at the cryogenic temperature range. Photoelectron spectroscopy at near ambient pressure shows that the water adsorption at defective sites reaches a saturation condition. For water pressures lower than 1 × 10 −4 mbar, the crystalline structure of the Mn 3 O 4 (001) thin film is preserved. Temperature-programmed spectroscopy probed the desorption process and showed that the water interaction induces a phase transition from Mn 3 O 4 to MnO.

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Interaction of water and carbon monoxide with MnO(001) thin films on Au(111)

Abstract: Atomically defined MnO(001) thin films were grown on an Au(111) substrate, and their interaction with water (D2O) was investigated by Infrared Reflection Absorption Spectroscopy (IRAS) and Thermal Desorption Spectroscopy (TDS)....

Cited by 2 publications

References 62 publications

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

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

Insights into the Reactivity of the Mn₃O₄(001) Thin Film with Water

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Interaction of water and carbon monoxide with MnO(001) thin films on Au(111)

Abstract: Atomically defined MnO(001) thin films were grown on an Au(111) substrate, and their interaction with water (D2O) was investigated by Infrared Reflection Absorption Spectroscopy (IRAS) and Thermal Desorption Spectroscopy (TDS)....

Cited by 2 publications

References 62 publications

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

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

Insights into the Reactivity of the Mn3O4(001) Thin Film with Water

Contact Info

Product

Resources

About

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

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

Insights into the Reactivity of the Mn₃O₄(001) Thin Film with Water