Interfaces of ionic liquids and transition metal surfaces - Adsorption, growth, and thermal reactions of ultrathin [C 1C 1Im] [Tf 2N] films on metallic and oxidised Ni(111) surfaces

Cremer T, Wibmer L, Krick Calderon S, Deyko A, Maier F, Steinrück HP (2012)


Publication Type: Journal article

Publication year: 2012

Journal

Original Authors: Cremer T., Wibmer L., Calderon S.K., Deyko A., Maier F., Steinrück H.-P.

Publisher: Royal Society of Chemistry

Book Volume: 14

Pages Range: 5153-5163

Journal Issue: 15

DOI: 10.1039/c2cp40278e

Abstract

Ultrathin films of the ionic liquid 1,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide ([C C Im][Tf N]) were deposited on differently terminated Ni(111) single crystal surfaces. The initial wetting behaviour, the growth characteristics, the molecular arrangement at the interface, and thermal reactivity were investigated using angle-resolved X-ray photoelectron spectroscopy (ARXPS). On clean Ni(111), the initial growth occurs in a layer-by-layer mode. At submonolayer coverages up to at least 0.40 ML, a preferential arrangement of the IL ions in a bilayer structure, with the imidazolium cations in contact with the Ni surface atoms and the anions on top of the cation, is deduced. For higher coverages, a transition to a checkerboard-type arrangement occurs, which is most likely due to repulsive dipole-dipole interactions in the first layer. An overall preference for a checkerboard-type adsorption behaviour, i.e., anions and cations adsorbing next to each other, is found on the oxygen-precovered O(√3×√3)R30°Ni(111) surface. The thermal stability of adsorbed IL layers on Ni(111) and on a fully oxidised Ni(111) surface was studied by heating the layers to elevated temperatures. For clean Ni(111) reversible adsorption takes place. For the oxidised surface, however, only cation-related moieties desorb, starting at ∼450 K, while anion-related signals remain on the surface up to much higher temperatures. © 2012 the Owner Societies.

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APA:

Cremer, T., Wibmer, L., Krick Calderon, S., Deyko, A., Maier, F., & Steinrück, H.-P. (2012). Interfaces of ionic liquids and transition metal surfaces - Adsorption, growth, and thermal reactions of ultrathin [C 1C 1Im] [Tf 2N] films on metallic and oxidised Ni(111) surfaces. Physical Chemistry Chemical Physics, 14(15), 5153-5163. https://dx.doi.org/10.1039/c2cp40278e

MLA:

Cremer, Till, et al. "Interfaces of ionic liquids and transition metal surfaces - Adsorption, growth, and thermal reactions of ultrathin [C 1C 1Im] [Tf 2N] films on metallic and oxidised Ni(111) surfaces." Physical Chemistry Chemical Physics 14.15 (2012): 5153-5163.

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