1. Department of Chemistry and Research Center for Sustainable Energy and Nanotechnology; National Chung Hsing University; Taichung 402 Taiwan
2. Department of Chemical Engineering; National Tsing Hua University; Hsinchu 300 Taiwan
3. Center for MeasurementStandards; Industrial Technology Research Institute; Rm 213A, Bldg. 3, No. 321, Sec. 2, Kuang Fu Rd. Hsinchu 30011 Taiwan