1. Department of Chemistry; National Taiwan University; Taipei 10617 Taiwan
2. Institute of Atomic and Molecular Sciences; Academia Sinica; P.O. Box 23-166 Taipei 106 Taiwan
3. Nano Science and Technology Program; Taiwan International Graduate Program; Academia Sinica; Taipei 11529 Taiwan
4. Department of Applied Physics and Chemistry; University of Taipei; Taipei 10048 Taiwan
5. Department of Engineering and System Sciences; National Tsing-Hua University; Hsinchu 30013 Taiwan
6. Department of Chemical Engineering; National Taiwan University; Taipei 10617 Taiwan