1. Institute of Applied Physics (APH); Karlsruhe Institute of Technology (KIT); Wolfgang-Gaede-Str. 1 76131 Karlsruhe Germany
2. Institute of Functional Interfaces (IFG); Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
3. Department of Micro- and Nanotechnology; Technical University of Denmark (DTU); Ørsteds Plads 2800 Kgs. Lyngby Denmark
4. Nano-BioScience Research Group; Technical University of Denmark (DTU); DTU Food, Søltofts Plads 2800 Kgs. Lyngby Denmark
5. Biointerfaces Institute & Chemical Engineering; University of Michigan; Ann Arbor MI 48109 USA