1. School of Mechanical Systems Engineering; Chonnam National University; 77 Yongbong-ro Buk-gu Gwang-Ju 500-757 Republic of Korea
2. Graphene Research Center in KINC and Department of Mechanical Engineering; School of Mechanical and Aerospace Engineering; Korea Advanced Institute of Science and Technology (KAIST); 291 Daehak-ro Yuseong-gu Daejeon 305-338 Republic of Korea