1. Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore.
2. Photosciences and Photonics Group, Chemical Sciences and Technology Division, Council of Scientific and Industrial Research–National Institute for Interdisciplinary Science and Technology, Trivandrum 695019, India.
3. School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, 637459 Singapore, Singapore.
4. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore.