1. Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
2. Institute of Organic Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
3. Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz, D-76344 Eggenstein-Leopoldshafen, Germany
4. Microscopy of Nanoscale Structures & Mechanisms (MNM), Laboratory for Electron Microscopy (LEM), Karlsruhe Institute of Technology (KIT), Engesserstr. 7, Karlsruhe 76131, Germany
5. Institute of Biological and Chemical Systems (IBCS-FMS), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
6. Biointerfaces Institute and Departments of Biomedical Engineering and Chemical Engineering, University of Michigan, 2800 Plymouth Road, Ann Arbor, Michigan 48109, United States