1. Physics Department & Shanghai Key Laboratory of Magnetic Resonance
2. School of Physics and Electronic Science
3. East China Normal University
4. 200062 Shanghai
5. P. R. China
6. Max-Planck-Institute for Polymer Research
7. 55128 Mainz
8. Germany
9. Shenzhen Key Laboratory of Polymer Science and Technology
10. Guangdong Research Center for Interfacial Engineering of Functional Materials
11. College of Materials Science and Engineering
12. Shenzhen University
13. Shenzhen 518055
14. Shanghai institute of Organic Chemistry
15. Chinese Academy of Sciences
16. Shanghai 200032
17. China