Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.20: Poster
Dienstag, 1. April 2014, 18:30–22:00, P1
Comparison of the adsorption behavior of the ionic liquids [EMIM][TFSA] and [OMIM][TFSA] on Au(111) and Ag(111) — •Benedikt Uhl1,2, Hsinhui Huang1, Dorothea Alwast1,2, Florian Buchner2, and R. Jürgen Behm1,2 — 1Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm, Germany — 2Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage, D-89069 Ulm, Germany
Ionic liquids (IL) have attracted high interest because of their special chemical and physical properties; e.g., the application in electrolytes of Li-ion batteries is a promising concept. To gain a better understanding of the fundamental molecular processes at the electrode|electrolyte interface, the interaction of 1-ethyl-3-methylimidazolium-bis(trifluoromethylsulfonyl)imide ([EMIM][TFSA]) and 1-octyl-3-methylimidazolium-bis(trifluoromethyl-sulfonyl)imide ([OMIM][TFSA]) with Au(111) and Ag(111) was investigated by scanning tunneling microscopy (STM) under UHV conditions at temperatures between 80 K - 293 K. Since both ILs differ only in the length of their alkyl chains, differences in structure formation on the same surface can solely be caused by this. For Au(111) as well as for Ag(111), both ILs show a very similar behavior: long-range ordered (2D crystalline) domains/islands coexist with a short-range ordered (2D glass) phase. The 2D crystalline structures of both IL adsorbates showed the same space requirement per adsorbed molecule, which points to an adsorption geometry of the molecule with the alkyl chain sticking up from the surface.