1. Department of Physics; Technische Universität München; James-Franck-Strasse 1 85748 Garching Germany
2. Deutsches Museum; Museumsinsel 1 80538 München Germany
3. Nanosystems-Initiative-Munich and Center for Nanoscience; Schellingstrasse 4 80799 München Germany
4. Department of Physics, Chemistry and Biology; IFM Linköping University; 58183 Linköping Sweden
5. Institute for Materials Science-Multicomponent Materials; Christian-Albrechts-Universität zu Kiel; Kaiserstrasse 2 24143 Kiel Germany
6. Center of Micro- & Nanochemistry & Engineering, Organische Chemie I; Universität Siegen; Adolf-Reichwein-Strasse 2 57068 Siegen Germany