1. Applied Physics Graduate Program and Smalley-Curl Institute, Rice University, 6100 Main Street, Houston, Texas 77005, United States
2. Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
4. Department of Materials Science and NanoEngineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
5. Smalley-Curl Institute, the NanoCarbon Center, and the Rice Advanced Materials Institute, Rice University, 6100 Main Street, Houston, Texas 77005, United States
6. Department of Physics, Corban University, 5000 Deer Park Drive SE, Salem, Oregon 97317, United States
7. Department of Computer Science, Rice University, 6100 Main Street, Houston, Texas 77005, United States