1. Institut für Chemie neuer Materialien and CellNanOSUniversität Osnabrück Barbarastr. 7 Osnabrück 49076 Germany
2. Institute of Nanotechnology (INT) and KarlsruheNano Micro Facility (KNMF)Karlsruhe Institute of Technology (KIT) Hermann‐von‐Helmholtz‐Platz 1 Eggenstein‐Leopoldshafen 76344 Germany
3. Institute of Chemical TechnologyUniversität Leipzig Leipzig 04103 Germany
4. Physical Institute and Center for Nanotechnology (CeNTech)University of Münster Münster 48149 Germany