1. Department of Environmental System Engineering, Chonnam National University, Yeosu 59626, Jeollanam-do, Republic of Korea
2. NanoSD Inc., 11575 Sorrento Valley Rd., San Diego, CA 92121, USA
3. Department of Polymer Science and Engineering, Sunchon National University, Suncheon 57922, Jeollanam-do, Republic of Korea