1. State Key Laboratory of Superhard Materials Jilin University Changchun 130012 P. R. China
2. Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology College of Engineering Physics, and Center for Advanced Material Diagnostic Technology Shenzhen Technology University Shenzhen 518118 P. R. China
3. School of Advanced Materials and Nanotechnology Xidian University Xi'an 710126 P. R. China
4. College of Life and Environmental Science Wenzhou University Wenzhou 325035 P. R. China