1. Institute of Chemical Physics, University of Latvia, Riga, Latvia, Materials and Supercritical Fluids Group, Department of Chemistry and the Tyndall National Institute, University College Cork, Cork, Ireland, Electron Microscopy and Analysis Facility, Tyndall National Institute, Lee Maltings, Prospect Row, Cork Ireland, and Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Dublin 2, Ireland