1. Department of Physics
2. Sogang University
3. Seoul 04107
4. Korea
5. School of Materials Science and Engineering
6. Ulsan National Institute of Science and Technology (UNIST)
7. Ulsan 44919
8. Center for Multidimensional Carbon Materials
9. Center for Nanophase Materials Sciences
10. Oak Ridge National Laboratory
11. Oak Ridge
12. USA
13. Department of Physics and Energy Harvest Storage Research Center
14. University of Ulsan
15. Ulsan 44610