1. Department of Chemistry, Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon 34141, Republic of Korea
2. Department of Mechanical Engineering, Rose-Hulman Institute of Technology, 5500 Wabash Ave., Terre Haute, IN 47803, USA
3. Department of Aerospace Engineering and Mechanics, University of Minnesota, 110 Union St. SE, Minneapolis, MN 55455, USA
4. School of Physics and Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455, USA
5. Department of Polymer Engineering, Pukyong National University, Nam-gu, Busan 48513, Republic of Korea