1. Center for Nanochemistry; Beijing Science and Engineering Center for Nanocarbons; Beijing National Laboratory for Molecular Sciences; College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 China
2. Department of Chemistry and Center for Nano and Micro Mechanics (CNMM); Tsinghua University; Beijing 100084 China
3. Division of Powder Graphene Technology; Beijing Graphene Institute; Beijing 100095 China