1. CAS Key Laboratory of Design and Assembly of Functional Nanostructuresand Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of Sciences Fuzhou Fujian 350002 P. R. China
2. University of Chinese Academy of Sciences Beijing 100049 P. R. China
3. Instrumentation Analysis and Research Center Fuzhou University Fuzhou Fujian 350002 P. R. China