1. NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore
2. Singapore Synchrotron Light Source, National University of Singapore, Singapore 117603, Singapore
3. Department of Material Science and Engineering, National University of Singapore, Singapore 117575, Singapore
4. NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore 117456, Singapore
5. Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore