1. Department
of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania
19104, United States
2. Department
of Materials Science
and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
3. Department of Nuclear Science
and Engineering, MIT, Cambridge, Massachusetts
02139, United States
4. Center
for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973,
United States
5. Department
of Electrical and
Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
6. Department
of Materials Science
and Engineering, MIT, Cambridge, Massachusetts
02139, United States
7. Department of Chemical and Biomolecular
Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States