1. Empa, Swiss Federal Laboratories for Materials Science and Technology, nanotech@surfaces Laboratory, 8600 Dübendorf, Switzerland
2. Max Planck Institute for Polymer Research, 55128 Mainz, Germany
3. Institute of Physical Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
4. Organic and Carbon Nanomaterials Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa 904-0495, Japan
5. Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland