1. Max Planck Institute for Polymer Research Ackermannweg 10 55128 Mainz Germany
2. Organic and Carbon Nanomaterials Unit Okinawa Institute of Science and Technology Graduate University Kunigami-gun, Okinawa 904-0495 Japan
3. School of Science and Technology Nottingham Trent University Clifton Lane, Nottingham NG11 8NS UK
4. Department of Materials Science Fudan University Shanghai 200433 P.R. China
5. Department of Chemistry Johannes Gutenberg University Mainz Duesbergweg 10–14 55128 Mainz Germany