1. Center for Multidimensional
Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan 689-798, Republic of Korea
2. Center for Functional
Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
3. Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
4. Chemistry Department,
Brookhaven National Laboratory, Upton, New York 11973, United States
5. Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
6. Department
of Chemistry and School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea
7. Department of Electrical & Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States