1. Department
of Chemistry, National University of Singapore 3 Science Drive 3, 117543, Singapore
2. Department
of Physics National University of Singapore 2 Science Drive 3, 117542 Singapore
3. Chinese
Education Ministry Key Laboratory of Resource Chemistry, Shanghai Normal University, Shanghai 200234, China
4. Institute of Materials Research & Engineering, 3 Research Link, 117602, Singapore
5. National University of Singapore (Suzhou) Research Institute, 377 Lin Quan Street, Suzhou Industrial Park, Suzhou, Jiang Su 215123, China