1. Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu 30010 Taiwan
2. Department of Engineering and System Science National Tsing Hua University Hsinchu 30013 Taiwan
3. Department of Material Science and Engineering National Tsing Hua University Hsinchu 30013 Taiwan
4. Department of Chemical Engineering National Tsing Hua University Hsinchu 30013 Taiwan
5. Department of Physics National Changhua University of Education Changhua 50007 Taiwan