1. Materials and Supercritical Fluid Group, Department of Chemistry and the Tyndall National Institute, University College Cork, Cork, Ireland
2. Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Dublin 2, Ireland
3. Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, United Kingdom
4. Electron Microscopy and Analysis Facility (EMAF), Tyndall National Institute, Lee Maltings, Prospect Row, Ireland