1. School
of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
2. Centre for Biomimetic
Sensor Science, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553, Singapore
3. School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore