1. Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602
2. Institute of Chemical and Engineering Sciences, A*STAR (Agency for Science, Technology and Research), 1 Pesek Road, Jurong Island, Singapore 627833
3. Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
4. Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576