1. Institute
of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, #08-32, Singapore 138634
2. Department
of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585
3. Environmental
and Water Technology Centre of Innovation, Ngee Ann Polytechnic, 535 Clementi Road, Singapore 599489
4. Centre
for Nanofibers and Nanotechnology, Nanoscience and Nanotechnology
Initiative, National University of Singapore, Singapore 117576
5. National Synchrotron
Radiation Research Center, Hsinchu 30076, Taiwan
6. School
of Engineering, Royal Melbourne Institute of Technology, Melbourne, Victoria 3001, Australia