1. Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, People's Republic of China
2. Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, USA
3. Inner Mongolia Key Laboratory of Carbon Nanomaterials, Nano Innovation Institute (NII), College of Chemistry and Materials Science, Inner Mongolia Minzu University, Tongliao 028000, People's Republic of China
4. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, People's Republic of China