Bulk-TiS2 is commercially available and investigation of its morphology by scanning electron microscopy (SEM) reveals mainly flake-like particles with lateral sizes in the range of tens of micrometers (Fig. ). The particle size of bulk-TiS2 is then reduced by ball-milling for 8 h. The resulting particles with flake-like morphology show a reduced particle size, ranging from several hundreds of nanometers to a few micrometers (Fig. ).