1. Institute of Material
Science and Engineering, Key Laboratory for Magnetism and Magnetic
Materials of the Ministry of Education, Key Laboratory of Special
Function Materials and Structure Design of Ministry of Education, Lanzhou University, Lanzhou 730000, China
2. Department of Chemical Engineering and Biointerfaces Institute, University of Michigan, Ann Arbor, Michigan 48109-2136, United States
3. No. 1 Middle School of Lanzhou, Lanzhou 730000, China