Affiliation: | 1. Department of Chemistry & Environmental Science, Zhangzhou Normal University, Zhangzhou 363000 (P. R. China), Fax: (+86)?0596‐2592563;2. Laboratory for Nanomaterials, National Center for Nanoscience and Technology, Beijing 100190 (P. R. China), Fax: (+86)?010‐62656765 |