1. Materials
Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, New Jersey 08854, United States
2. Department
of Chemistry and Chemical Biology, Rutgers University, 610 Taylor
Road, Piscataway, New Jersey 08854, United States
3. WPI
Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
4. JST, PRESTO, 4-1-8 Honcho
Kawaguchi, Saitama 332-0012, Japan
5. Department
of Chemical and Biochemical Engineering, Rutgers University, 98 Brett Road, Piscataway, New Jersey 08854, United States
6. Department
of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
7. Physics
Department and Graphene Research Centre, National University of Singapore, 2 Science Drive 3, Singapore 117542
8. Chemistry
Department, National University of Singapore, 3 Science Drive 3, Singapore 117543