1. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
2. Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, Harvard University, 665 Huntington Avenue, Boston, Massachusetts 02115, United States
3. School of Biological Sciences, Nanyang Technological University,Singapore 639798, Singapore
4. The Connecticut Agricultural Experiment Station, New Haven, Connecticut 06511, United States
5. Environmental Chemistry and Materials Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, 637141, Singapore
6. Singapore-HUJ Alliance for Research and Enterprise (SHARE), Singapore 138602, Singapore