1. Graphene Research Institute
2. Sejong University
3. Seoul 143-747
4. Republic of Korea
5. Institute of Nano and Advanced Materials Engineering
6. Division of Electronics and Electrical Engineering
7. Dongguk University-Seoul
8. Seoul 04620
9. Thin Film Materials Research Center
10. Korea Research Institute of Chemical Technology
11. Daejon 305-600
12. Korea