1. Institute of Physics; University of Freiburg; 79104 Freiburg Germany
2. Hermann Staudinger Graduate School; University of Freiburg; 79104 Freiburg Germany
3. School of Materials Science & Engineering; Zhengzhou University; Zhengzhou 450002 China
4. Chair of Chemical Materials Science; Department of Chemistry; University of Konstanz; 78464 Konstanz Germany
5. Institute of Macromolecular Chemistry; University of Freiburg; 79104 Freiburg Germany
6. Freiburg Materials Research Centre; University of Freiburg; 79104 Freiburg Germany