1. Institute of Materials
Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, #08-03, Singapore 138634, Singapore
2. School
of Electrical and Electronics Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
3. Department
of Mechanical Engineering, National University of Singapore, 21 Lower
Kent Ridge Road, Singapore 119077, Singapore