1. School of Materials Science and Engineering; Nanyang Technological University Singapore; 639798 Singapore Singapore
2. Temasek Laboratories @NTU; Nanyang Technological University Singapore; Research Techno Plaza, 50 Nanyang Drive 637553 Singapore Singapore
3. Computational Center for Molecular Science; College of Chemistry; Nankai University; Tianjin 300071 China
4. Department of Materials Science and Engineering; Tokyo Institute of Technology, 2-12-1 Ookayama; Meguro-ku Tokyo 152-8552 Japan
5. Division of Chemistry and Biological Chemistry, School of Physical and Mathematics Science; Nanyang Technological University Singapore; 637371 Singapore Singapore