1. Nano-Device Laboratory (NDL) and Phonon Optimized Engineered Materials (POEM) Center, Department of Electrical and Computer Engineering, University of California, Riverside, California 92521, United States
2. Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521, United States
3. Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States
4. Material Science and Engineering Program, University of California, Riverside, California 92521, United States