1. Department of Chemistry; National Tsing Hua University; Hsinchu 30013 Taiwan
2. Graduate Institute of Electronics Engineering and Department of Electrical Engineering; National Taiwan University; Taipei 10617 Taiwan
3. College of Metallurgy and Resources; Institute of Molecular Engineering and Applied Chemistry; Anhui University of Technology; Ma'anshan Anhui 243002 China
4. Department of Chemistry; National Taiwan University; Taipei 10617 Taiwan