1. Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
2. U.S. Army Research Laboratory, Sensors and Electron Devices Directorate, 2800 Powder Mill Road, Adelphi, Maryland 20783, United States
3. Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
4. Center for Computational Materials Science, Naval Research Laboratory, Washington, D.C. 20375, United States