1. School of Materials Science and Engineering
2. Gwangju Institute of Science and Technology
3. Gwangju 61005
4. Republic of Korea
5. Photo-electronic Hybrids Research Center
6. Korea Institute of Science and Technology
7. Seoul 02792
8. Carbon Nanomaterials Design Laboratory
9. Graduate School of Analytical Science and Technology
10. Chungnam National University
11. Daejeon 34134
12. Division of Electron Microscopic Research
13. Korea Basic Science Institute
14. Daejeon 34133
15. Department of Energy Science