1. Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
2. Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
3. Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
4. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
5. General Education Center, National Tainan Junior College of Nursing, Tainan City 700, Taiwan
6. Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan