1. Department of Physics, The University of Texas at Arlington, Arlington, Texas 76019, United States
2. Laboratory on High-Strength Structural Materials, Central South University, Changsha 410083, P. R. China
3. School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China
4. Department of Chemistry, College of Sciences, Northeastern University, Shengyang 110819, China
5. Jilin University, Changchun, Jilin China