Ultrathin [C1C1Im][Tf2N] Layers on Supported Mn3O4(001) Films
Barreto J, Talwar T, Steinrück HP, Maier F (2025)
Publication Type: Journal article
Publication year: 2025
Journal
Article Number: 147034
DOI: 10.1007/s11244-025-02053-8
Abstract
In the Solid Catalyst with Ionic Liquid Layer concept, activity and selectivity of a solid catalyst such as metal particles supported on porous oxides can be tuned and optimized by ultrathin ionic liquid (IL) coatings. In this context of ILs interacting with oxide surfaces, we report on the adsorption behavior and thermal stability of the IL 1,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide ([C1C1Im][Tf2N]) on well-ordered Mn3O4(001) thin films grown on Au(111) using angle-resolved X-ray photoelectron spectroscopy. We observe the formation of a two dimensional IL wetting layer for IL coverages ≤ 0.5 ML, while multilayers on top of the closed wetting layer (≥ 0.5 ML) grow in 3D islands. For both coverage regimes, the IL anion is preferentially oriented in a cis conformation with the CF3 groups preferentially pointing to the vacuum and SO2 groups towards the oxide surface. Temperature-programmed XPS shows that the multilayer starts to desorb at around 300 K as neutral ion pairs. Above 400 K, the IL wetting layer decomposes, which is characterized by the disappearance of cation-related XPS signals until ~ 450 K, while anion signals remain until 500 K. In comparison to [C1C1Im][Tf2N] films on reactive metal surfaces such as Cu(111) and Pt(111), the IL exhibits a higher thermal stability on Mn3O4(001).
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How to cite
APA:
Barreto, J., Talwar, T., Steinrück, H.-P., & Maier, F. (2025). Ultrathin [C1C1Im][Tf2N] Layers on Supported Mn3O4(001) Films. Topics in Catalysis. https://doi.org/10.1007/s11244-025-02053-8
MLA:
Barreto, Jade, et al. "Ultrathin [C1C1Im][Tf2N] Layers on Supported Mn3O4(001) Films." Topics in Catalysis (2025).
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