1. School of Energy and Chemical Engineering, KIER-UNIST Advanced Center for Energy, Low Dimensional Carbon Materials Center; Ulsan National Institute of Science and Technology (UNIST); Ulsan 689-798 Republic of Korea
2. Department of Materials Science and Engineering and Graphene Research Center of KI For the NanoCentury; Korea Advanced Institute of Science and Technology (KAIST); Daejeon 305-701 Republic of Korea
3. NEXEN Tire Corporation R&D Center; Kyungnam 626-230 Republic of Korea
4. Division of Advanced Materials Engineering; Kongju National University; Chungnam 330-717 Republic of Korea