1. Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 05006, Republic of Korea
2. GRI−TPC International Research Center, Sejong University, Seoul 05006, Republic of Korea
3. Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
4. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
5. Department of Materials Science and Engineering, The University of Texas at Dallas, Richardson, Texas 75080, United States
6. Graphene Research Institute, Department of Physics, Sejong University, Seoul 05006, Republic of Korea
7. Department of Display Materials Engineering, Soonchunhyang University, Asan, Chungnam 31538, Republic of Korea
8. Science Research Center (SRC) for Novel Epitaxial Quantum Architectures, Institute of Applied Physics, Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
9. Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
10. School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea