1. School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia
2. Department of Physics and Engineering, Centenary College of Louisiana, Shreveport, Louisiana 71104, United States
3. Electron Microscope Unit, Mark Wainwright Analytical Centre, University of New South Wales, Sydney, NSW 2052, Australia
4. ARC Centre of Excellence for Nanoscale Bio Photonics, School of Science, RMIT University, Melbourne, VIC 3004, Australia
5. BMIF, Mark Wainwright Analytical Centre, University of New South Wales, Sydney, NSW 2052, Australia
6. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
7. Electron Imaging and Spectroscopy Tools, PO Box
506, Sans Souci, NSW 2219, Australia
8. Physics, School of Science, RMIT University, Melbourne, Victoria 3001, Australia