1. Department of Physics Chemistry and Biology, IFM Linköping University 58183 Linköping Sweden
2. nanotech@surfaces Laboratory Empa, Swiss Federal Laboratories for Materials Science and Technology Überlandstrasse 129 8600 Dübendorf Switzerland
3. ESISNA group Materials Science Factory Institute of Material Science of Madrid (ICMM–CSIC) Sor Juana Inés de la Cruz 3 28049 Madrid Spain
4. Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
5. Current address: Department of Chemistry University of Oxford Chemistry Research Laboratory Oxford OX1 3TA UK
6. Faculty of Chemistry and Food Chemistry & Center for Advancing Electronics Dresden Technische Universität Dresden 01062 Dresden Germany
7. Organic and Carbon Nanomaterials Unit Okinawa Institute of Science and Technology Graduate University 1919-1 Tancha, Onna-son, Kunigami-gun Okinawa 904-0495 Japan
8. Department of Chemistry Biochemistry and Pharmaceutical Sciences University of Bern Freiestrasse 3 3012 Bern Switzerland