1. Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences Qingdao 266101 P. R. China
2. Beijing National Laboratory for Molecular Sciences (BNLMS)Institute of ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
3. Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of Sciences Beijing 100049 P. R. China