1. Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
2. The Richard E. Smalley Institute for Nanoscale Science and Technology, Rice University, 6100 Main Street, Houston, Texas 77005, United States
3. Department of Mechanical Engineering and Materials Science, Rice University, 6100 Main Street, Houston, Texas 77005, United States
4. Technological Institute for Superhard and Novel Carbon Materials, 7a Centralnaya Street, Troitsk, Moscow, Russia 142190
5. Moscow Institute of Physics and Technology (State University), 9 Institutsky Lane, Dolgoprudny, Russia 141700
6. Emanuel Institute of Biochemical Physics RAS, 4 Kosigin Street, Moscow, Russia 119334