1. Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
2. Smalley-Curl Institute, Rice University, 6100 Main Street, Houston, Texas 77005, United States
3. Technical Chemistry I and Center for Nanointegration, Duisburg-Essen, University of Duisburg-Essen, Universitätsstraße 7, 45141 Essen, Germany
4. Applied Physics Program, Rice University, 6100 Main Street, Houston, Texas 77005, United States
5. Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
6. Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States