1. Department of Chemistry, Rice University, Houston, Texas 77005, United States
2. Department of Chemical and Biomolecular Engineering, Rice University, Houston, Texas 77005, United States
3. Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106, United States
4. Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106, United States
5. Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, United States
6. Smalley-Curl Institute, Rice University, 6100 Main Street, Houston, Texas 77005, United States