1. Graduate School of Energy, Environment, Water and Sustainability (EEWS); Graphene Research Center; Korea Advanced Institute of Science and Technology (KAIST); Daejeon 305-701 South Korea
2. Nanomechanical Systems Research Division; Korea Institute of Machinery and Materials (KIMM); Daejeon 305-343 South Korea
3. Graduate School of Nanoscience and Technology (GSNT); KAIST; Daejeon 305-701 South Korea
4. Department of Chemistry; Center for Nanomaterials and Chemical Reactions; Institute for Basic Science; Korea Advanced Institute of Science and Technology (KAIST); Daejeon 305-701 South Korea
5. Department of Nanomechatronics; Korea University of Science and Technology (UST); Daejeon 305-350 South Korea