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Uhl B, Huang H, Alwast D, et al. Interaction of ionic liquids with noble metal surfaces: structure formation and stability of [OMIM][TFSA] and [EMIM][TFSA] on Au(111) and Ag(111). Phys Chem Chem Phys. 2015;17(37):23816-32doi: 10.1039/c5cp03787e.
Uhl, B., Huang, H., Alwast, D., Buchner, F., & Behm, R. J. (2015). Interaction of ionic liquids with noble metal surfaces: structure formation and stability of [OMIM][TFSA] and [EMIM][TFSA] on Au(111) and Ag(111). Physical chemistry chemical physics : PCCP, 17(37), 23816-32. https://doi.org/10.1039/c5cp03787e
Uhl, Benedikt, et al. "Interaction of ionic liquids with noble metal surfaces: structure formation and stability of [OMIM][TFSA] and [EMIM][TFSA] on Au(111) and Ag(111)." Physical chemistry chemical physics : PCCP vol. 17,37 (2015): 23816-32. doi: https://doi.org/10.1039/c5cp03787e
Uhl B, Huang H, Alwast D, Buchner F, Behm RJ. Interaction of ionic liquids with noble metal surfaces: structure formation and stability of [OMIM][TFSA] and [EMIM][TFSA] on Au(111) and Ag(111). Phys Chem Chem Phys. 2015 Oct 07;17(37):23816-32. doi: 10.1039/c5cp03787e. Epub 2015 Aug 25. PMID: 26305417.
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Phys Chem Chem Phys. 2015 Oct 07;17(37):23816-32. doi: 10.1039/c5cp03787e. Epub 2015 Aug 25.

Interaction of ionic liquids with noble metal surfaces: structure formation and stability of [OMIM][TFSA] and [EMIM][TFSA] on Au(111) and Ag(111).

Physical chemistry chemical physics : PCCP

Benedikt Uhl, Hsinhui Huang, Dorothea Alwast, Florian Buchner, R Jürgen Behm

Affiliations

  1. Institute of Surface Chemistry and Catalysis, Ulm University, Albert-Einstein-Allee 47, D-89081 Ulm, Germany. [email protected].

PMID: 26305417 DOI: 10.1039/c5cp03787e

Abstract

Aiming at a comprehensive understanding of the interaction of ionic liquids (ILs) with metal surfaces we have investigated the adsorption of two closely related ILs, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [EMIM][TFSA] and 1-methyl-3-octylimidazolium bis(trifluoromethylsulfonyl)imide [OMIM][TFSA], with two noble metal surfaces, Au(111) and Ag(111), under ultrahigh vacuum (UHV) conditions using scanning tunneling microscopy (STM). At room temperature, the ILs form a 2D liquid on either of the two surfaces, while at lower temperatures they condense into two-dimensional (2D) islands which exhibit ordered structures or a short-range ordered 2D glass structure. Comparison of the adlayer structures formed in the different adsorption systems and also with those determined recently for n-butyl-n-methylpyrrolidinium [TFSA](-) adlayers on Ag(111) and Au(111) (B. Uhl et al., Beilstein J. Nanotechnol., 2013, 4, 903) gains detailed insight into the adsorption geometry of the IL ions on the surface. The close similarity of the adlayer structures indicates that (i) the structure formation is dominated by the tendency to optimize the anion adsorption geometry, and that (ii) also in the present systems the cation adsorbs with the alkyl chain pointing up from the surface.

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