1. Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore
2. Department of Physics & Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
3. Research Centre for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
4. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
5. Department of Material Science and Engineering, National University of Singapore, Singapore 117575, Singapore
6. Agency for Science Technology and Research, Institute of Materials Research and Engineering, 2 Fusionopolis Way, Singapore 138634, Singapore