1. Department of Chemistry, Graduate school of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
2. Research Center for Exotic Nanocarbons (JST), Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
3. Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Normalização e Qualidade Industrial (INMETRO), Duque de Caxias, RJ 25250-020, Brazil
4. Department of Physics, Department of Materials Science and Engineering, and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802-6300, United States
5. BEL Japan, Inc., Haradanaka 1-9-1, Toyonaka-shi, Osaka 561-0807, Japan