1. Department
of Chemistry, National Taiwan University, Taipei 106, Taiwan
2. Nanoscience
and Technology Program, Taiwan International Graduate Program, Institute
of Physics, Academia Sinica and National Taiwan University, Taipei 106, Taiwan
3. Department
of Physics, National Taiwan Normal University, Taipei 116, Taiwan
4. Department
of Mechanical Engineering and Graduate Institute
of Manufacturing Technology, National Taipei University of Technology, Taipei 106, Taiwan