1. Department
of Polymer-Nano Science and Technology, Chonbuk National University, Jeonju 561-756, Korea
2. Department
of BIN Fusion Technology, Chonbuk National University, Jeonju 561-756, Korea
3. Department
of Materials Science and Optoelectronic Engineering, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
4. Department
of Polymer Science, University of Akron, Akron, Ohio 44325, United States