1. Research School of Electrical, Energy and Materials Engineering, The Australian National University, Canberra 2601, Australia
2. Flinders Institute for Nanoscale Science and Technology, Flinders University, Adelaide, South Australia 5042, Australia
3. Flinders Microscopy and Microanalysis, College of Science and Engineering, Flinders University, Adelaide, South Australia 5042, Australia
4. Central Facility of Electron Microscopy, Electron Microscopy Group of Materials Science, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany