Cremer T, Stark MW, Deyko A, Steinrück HP, Maier F (2011)
Publication Type: Journal article
Publication year: 2011
Original Authors: Cremer T., Stark M., Deyko A., Steinrück H.-P., Maier F.
Publisher: American Chemical Society
Book Volume: 27
Pages Range: 3662-3671
Journal Issue: 7
DOI: 10.1021/la105007c
Ultrathin films of two imidazolium-based ionic liquids (IL), [C CIm][TfN] (= 1,3-dimethylimidazolium bis(trifluoromethyl)imide) and [CCIm][TfN] (= 1-methyl-3-octylimidazolium bis(trifluoromethyl)imide) were prepared on a Au(111) single-crystal surface by physical vapor deposition in ultrahigh vacuum. The adsorption behavior, orientation, and growth were monitored via angle-resolved X-ray photoelectron spectroscopy (ARXPS). Coverage-dependent chemical shifts of the IL-derived core levels indicate that for both ILs the first layer is formed from anions and cations directly in contact with the Au surface in a checkerboard arrangement and that for [CC Im][TfN] a reorientation of the alkyl chain with increasing coverage is found. For both ILs, geometry models of the first adsorption layer are proposed. For higher coverages, both ILs grow in a layer-by-layer fashion up to thicknesses of at least 9 nm (>10 ML). Moreover, beam damage effects are discussed, which are mainly related to the decomposition of [TfN] anions directly adsorbed at the gold surface. © 2011 American Chemical Society.
APA:
Cremer, T., Stark, M.W., Deyko, A., Steinrück, H.-P., & Maier, F. (2011). Liquid/solid interface of ultrathin ionic liquid films: [C 1C1Im][Tf2N] and [C8C 1Im][Tf2N] on Au(111). Langmuir, 27(7), 3662-3671. https://dx.doi.org/10.1021/la105007c
MLA:
Cremer, Till, et al. "Liquid/solid interface of ultrathin ionic liquid films: [C 1C1Im][Tf2N] and [C8C 1Im][Tf2N] on Au(111)." Langmuir 27.7 (2011): 3662-3671.
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