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Toward a Crystalline MnO2-Like Planar Model Surface on Au Substrates
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DOI：10.1007/s11244-026-02336-8.png)
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Abstract
En 中文
Manganese dioxide is an earth-abundant and environmentally benign material with broad relevance to catalytic reactions. Here, we explore the preparation of crystalline MnO2-like planar model surfaces on Au(111) and Au(001) by molecular beam epitaxy (MBE), using O2 and NO2 as oxygen sources. The resulting MnOx structures depend jointly on substrate symmetry, oxygen chemical potential, and the Mn coverage. Under strongly oxidizing NO2 atmosphere, low nominal Mn coverage, defined here as less than 0.8 monolayer equivalent (MLE), produces a hexagonal oxygen-rich MnOx phase, whereas increasing the total Mn coverage to 1.2-2.0 MLE leads to the formation of a higher-coverage MnO2-like overlayer. High-resolution Scanning Tunneling Microscope (STM) and Scanning Tunneling Spectroscopy (STS) measurements, combined with DFT energetics, support oxygen-terminated O–Mn–O trilayer-related structures, with Au–O–Mn–O and Au–O–Mn–O–Mn–O as the most plausible models for the low- and high-coverage phases, respectively. These epitaxially stabilized phases provide atomically defined model surfaces for investigating manganese-oxide structure-property relationships.
Keywords:
Model catalysis
Scanning tunneling microscopy
Thin film
Manganese oxides
Manganese dioxide
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