1. National Synchrotron Radiation Research Center; 101 Hsin-Ann Road, Hsinchu Science Park Hsinchu 30076 Taiwan
2. Department of Chemical Engineering; National Tsing Hua University; Hsinchu 30013 Taiwan
3. Department of Materials Science and Engineering; National Chiao Tung University; 1001 Ta Hsueh Road Hsinchu 30050 Taiwan