1. School of Materials Science and Engineering; Jiangxi University of Science and Technology; 86 Hong Qi Road Ganzhou 341000 P. R. China
2. 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 P. R. China
3. Beijing Graphene Institute; Beijing 100094 P. R. China