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O: Fachverband Oberflächenphysik

O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)

O 35.17: Poster

Dienstag, 12. März 2013, 18:15–21:45, Poster B1

STM investigation on the structure formation of the ionic liquid BMP-TFSA on different metal surfaces — •Dorothea Alwast^{1, 2}, Benedikt Uhl^{1, 2}, Florian Buchner^{1, 2}, and R. Jürgen Behm¹ — ¹Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm, Germany — ²Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage, D-89069 Ulm, Germany

The application of ionic liquids in electrolytes is a promising concept for the improvement of Li-Ion batteries. Therefore, a detailed knowledge of the behavior of ionic liquids on the electrode electrolyte interface is crucial for further development. As a model system, adlayers of 1-butyl-1-methylpyrrolidinium-bis(trifluoromethylsulfonyl)imide (BMP-TFSA) have been investigated by scanning tunneling microscopy (STM). Measurements were carried out under UHV conditions in the submonolayer and monolayer regime, with particular emphasis on the structure formation of the first adsorbate layer. On Ag(111), BMP-TFSA forms a 2D liquid at room temperature, whereas at 100 K an ordered structure is observed on this surface. High-resolution STM images have been acquired and the sub-molecular features will be discussed. Details on structure formation of BMP-TFSA on Ag(111) as well as a comparison to surface structures of BMP-TFSA on Au(111) and Cu(111) surfaces are presented.