1. Department of Chemical EngineeringPohang University of Science and Technology (POSTECH) 77 Cheongam-ro, Nam-gu Pohang Gyeongbuk 37673 Republic of Korea
2. Division of Electron Microscopic Research GroupKorea Basic Science Institute (KBSI) 169-148 Gwahak-ro, Yuseong-gu Daejeon 34133 Republic of Korea
3. Carbon Resources InstituteKorea Research Institute of Chemical Technology (KRICT) 141 Gajeong-ro, Yuseong-gu Daejeon 34114 Republic of Korea