We cut the CFMs leaving only the visible carbon fiber tip, which was then scatter coated with 60%:40% Pt: Au prior to imaging on SEM using Zeiss Sigma 300 VP Field-Emission Scanning Electron Microscope (Zeiss, Oberkochen, Germany). We utilized an excitation energy of 10 keV and adjusted the working distance to ensure that striations of the carbon fibres was in focus.