Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 30: Inorganic/Organic Interfaces: Towards Application
O 30.5: Talk
Tuesday, March 17, 2015, 15:00–15:15, MA 043
Ultrathin Ionic Liquid Films on HOPG and on Ni(111)-supported graphene — •Florian Rietzler1, Jens Nagengast2, Hans-Peter Steinrück1, and Florian Maier1 — 1Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen — 2Lehrstuhl für Chemische Reaktionstechnik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen
Profound knowledge of the interfaces between ionic liquids (ILs) and carbonaceous surfaces is highly relevant in catalysis and electrochemistry. In this work, ultrathin films of the IL 1,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide ([C1C1Im][Tf2N]) were prepared under clean ultra high vacuum conditions by means of physical vapor deposition, and were analyzed by angle resolved XPS (ARXPS). The films were deposited onto highly oriented pyrolytic graphite (HOPG) as well-defined reference system, and onto nickel-supported graphene surfaces. Using ARXPS detailed information on the growth mode and on the molecular orientation of the IL is accessible.
For all investigated systems, clear evidence for three-dimensional growth was found. However, film morphology strongly depends on the nature of the substrate. In particular, the interaction of the IL with supported graphene seems to be stronger than with HOPG.
The results will be compared to ultrathin IL films deposited on well-defined metal surfaces such as Ni(111) and Au(111).