1. Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore
2. Department of Chemistry, University of Southampton, Southampton SO17 1BJ, U.K.
3. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Block N4.1, Singapore639798, Singapore
4. Institute of High-Performance Computing, Agency for Science Technology and Research (A*STAR), Singapore 138632, Republic of Singapore