1. College of Chemistry and Chemical Engineering
2. Xi’an University of Science and Technology
3. Xi’an 710054
4. P. R. China
5. CAS Center for Excellence in Nanoscience
6. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication
7. Division of Nanophotonics
8. National Center for Nanoscience and Technology (NCNST)
9. Beijing 100190