1. College of Advanced Interdisciplinary Studies National University of Defense Technology Changsha 410073 P. R. China
2. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and Engineering National University of Defense Technology Changsha 410000 P. R. China
3. Powder Metallurgy Research Institute Central South University Changsha 410073 P. R. China
4. 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
5. National Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources College of Chemistry and Chemical Engineering Hunan Normal University Changsha 410081 P. R. China
6. School of Physics and Electronics Central South University Changsha 410083 P. R. China