1. Institute of Functional Interfaces (IFG), ‡Institute of Applied
Materials
(IAM), §Institute
for Nanotechnology (INT), and ∥Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Baden-Württemberg, Germany