1. Department of Chemical and Environmental Engineering, University of California-Riverside, Riverside, California 92521, United States
2. Materials Science and Engineering Program, University of California-Riverside, Riverside, California 92521, United States
3. U.S. Army Research Laboratory, Adelphi, Maryland 20783, United States
4. Department of Physics and Astronomy, Hunter College of the City University of New York, New York, New York 10065, United States