1. Materials Physics and Applications Division; Los Alamos National Laboratory; Los Alamos NM 87545 USA
2. Department of Chemistry; Harbin Institute of Technology; Harbin 150001 PR China
3. Department of Chemical Engineering; University of South Carolina; Columbia SC 29208 USA
4. Department of Sciences; John Jay College of the City University of New York; New York NY 10019 USA
5. Interdisciplinary School of Green Energy; Ulsan National Institute of Science and Technology; Ulsan 689-798 Republic of Korea