1. State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing 100029 China
2. Department of Chemical and Biomolecular Engineering (BK21 four) Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea
3. School of Chemical Engineering and the Environment Beijing Institute of Technology Beijing 100081 China
4. National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan
5. Department of Physics National Tsing Hua University Hsinchu 30013 Taiwan
6. Department of Applied Physics The Hong Kong Polytechnic University Hong Kong China