1. Department of Chemistry; Dongguk University; Pil-dong 3-ga Jung-gu Seoul 100-715 South Korea
2. ARC Centre of Excellence for Electromaterials Science; Intelligent Polymer Research Institute; AIIM Facility, Innovation Campus; University of Wollongong; Wollongong NSW 2522 Australia
3. School of Chemical Engineering; Sungkyunkwan University (SKKU); Suwon 440-746 South Korea