1. Department of Polymer Engineering; Graduate School; Chonnam National University; 77 Yongbong-ro, Buk-gu Gwangju 500-757 South Korea
2. Alan G. MacDiarmid Energy Research Institute; School of Polymer Science and Engineering; Chonnam National University; 77 Yongbong-ro, Buk-gu Gwangju 500-757 South Korea