1. Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania
19104-6323, United States
2. Materials and Manufacturing
Directorate, Air Force Research Laboratory, Wright Patterson Air Force Base, Ohio 45433, United States
3. Institute of Advanced Composite
Materials, Korea Institute of Science and Technology, Dunsan-ri 864-9, Bondong-eup, Wanju-gun, Jeollabuk-do, Republic
of Korea
4. School of Materials
Engineering
and Birck Nanotechnology Center, Purdue University, 1205 West State Street, West Lafayette, Indiana 47907, United States