1. School of Chemical and Biomedical EngineeringNanyang Technological University Singapore 639798 Singapore
2. Singapore Centre on Environmental Life Sciences EngineeringNanyang Technological University Singapore 639798 Singapore
3. Interdisciplinary Graduate SchoolNanyang Technological University Singapore 639798 Singapore
4. Centre for Biomimetic Sensor ScienceSchool of Materials Science & EngineeringNanyang Technological University Singapore 639798 Singapore
5. Center for Polymers and Organic SolidsDepartments of Chemistry & Biochemistry and MaterialsUniversity of California Santa Barbara CA 93106 USA
6. Department of ChemistryChemical EngineeringBiomedical Engineering,and Materials Science & EngineeringUniversity of California Davis CA 95616 USA