Affiliation: | 1. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore), Fax: (+65)?67909081 http://www.ntu.edu.sg/home/qczhang/;2. Department of Chemistry, Northwestern University, Evanston, Illinois 60208 (United State);3. Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 90095 (USA) |