1. School of Materials Science and Engineering
2. Lanzhou Jiaotong University
3. Lanzhou
4. P. R. China
5. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication
6. CAS Center for Excellence in Nanoscience
7. National Center for Nanoscience and Technology
8. Beijing
9. China
10. Shanghai Synchrotron Radiation Facility
11. Shanghai Advanced Research Institute
12. Chinese Academy of Sciences
13. Shanghai 201204