1. School of Chemical and Biomedical Engineering Nanyang Technological University Singapore 639798 Singapore
2. Singapore Centre on Environmental Life Sciences Engineering (SCELSE) Nanyang Technological University Singapore 639798 Singapore
3. Department of Chemistry National University of Singapore Singapore 117543 Singapore
4. Centre for Biomimetic Sensor Science School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore
5. Interdisciplinary Graduate School Nanyang Technological University Singapore 639798 Singapore
6. Center for Polymers and Organic Solids Departments of Chemistry and Biochemistry and Materials University of California, Santa Barbara Santa Barbara CA 93106 USA