1. Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005-1892, United States
2. Department of Civil and Environmental Engineering, Rice University, 6100 Main St., Houston, Texas 77005, United States
3. Smalley-Curl Institute, NanoCarbon Center, and the Rice Advanced Materials Institute, Rice University, Houston, Texas 77005, United States
4. Applied Physics Program, Rice University, Houston, Texas 77005, United States
5. Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005-1892, United States
6. Department of Mechanical Engineering, Rice University, 6100 Main Street,Houston, Texas 77005, United States