1. Institute of Biological Interfaces IBG2, ‡Institute of Functional Interfaces IFG, §Institute of Applied Materials, Energy St. Sys. IAM-ESS, #Institute of Biological Interfaces IBG1, Karlsruhe Institute of Technology (KIT), D-76021 Karlsruhe, Germany
2. Laboratory for Electron Microscopy LEM, ⊥Institute of Organic Chemistry, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany