1. Centre for Biomimetic Sensor Science; Nanyang Technological University; 50 Nanyang Drive 637553 Singapore Singapore
2. School of Materials Science and Engineering; Nanyang Technological University; 50 Nanyang Avenue 639798 Singapore Singapore
3. Mechanobiology Institute; National University of Singapore; 117411 Singapore Singapore
4. Department of Chemistry; University of California; Berkeley CA 94720 USA
5. School of Chemical and Biomedical Engineering; Nanyang Technological University; 62 Nanyang Drive 637459 Singapore Singapore