Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 67: Poster Wednesday: Solid-Liquid Interfaces

O 67.6: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B2

X-Ray photoelectron spectroscopic study of the near surface composition of [TfO] and [Tf2N] based Ionic Liquids at different electrode surfaces — Aleksandr Baranov, •Fabian Ullmann, Anna Dimitrova, and Stefan Krischok — Institut für Physik und IMN MacroNano, Technische Universität Ilmenau, Deutschland

With this contribution we will discuss the electronic structure and the ion assembly of four Ionic Liquids (ILs): 1-Ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMim]TfO), 1-butyl-1-methylpyrrolidinium trifluoromethanesulfonate ([BMP]TfO), 1-ethyl-3-methylimida-zolium-bis-(trifluoromethylsulfonyl) imide ([EMim][Tf2N]) and 1-butyl-1-methyl pyrrolidinium-bis-(trifluoromethyl-sulfonyl)imide ([BMP][Tf2N]).

By using spin-coating technique and X-Ray Photoelectron spectroscopy we were able to prepare an IL*layers in *m and nm * range and to elucidate the chemical composition at the near surface and at the interface with three metal substrate: Ni, Ti and Au.

The results reveal that the cation/anion distribution depends on both: the IL used and the metal substrate. Moreover, a spectroscopic evidence demonstrate an existence of an anion*cation interaction, when TfO is present in the molecular structure.