1. Process Technology Division, Display Technology Center, Industrial Technology Research Institute, Hsinchu, Taiwan (Republic of China)
2. Department of Chemistry, National Central University, Jhong‐Li, Taiwan 32054 (Republic of China)
3. Department of Chemical & Biomolecular Engineering, Sogang University, 1 Shinsoo‐Dong, Mapo‐Gu, Seoul 121‐742 (Republic of Korea)