1. Institute of Fundamental and Frontier Sciences
2. University of Electronic Science and Technology of China
3. Chengdu 610054
4. P. R. China
5. Institut National de la Recherche Scientifique
6. State Key Laboratory of Bio-Fibers and Eco-Textiles & College of Physics
7. Qingdao University
8. Qingdao 266071
9. Division of Materials Science
10. Department of Engineering Sciences and Mathematics
11. Luleå University of Technology
12. SE-97187 Luleå
13. Sweden