Unstable single-layered colloidal TiS2 nanodisks

A study was conducted to investigate the instability and dynamic structural changes of monolayered colloidal titanium sulfide nanodisks at room temperature. The single-layered nanodisks was prepared by dissolving titanium chloride in well-dried oleyamine under argon at room temperature. The dissolved mixture was poured into excess methanol and centrifuged to retrieve the nanomaterials. Transmission electron microscopy (TEM) analysis was applied to show the assembly of thin plates. Energy-dispersive spectroscopy (EDS) in association with scanning electron microscopy (SEM) exhibited the stoichiometric ratio of Ti and S in the mixture. Powder X-ray diffraction (PXRD) patterns were used to show a single peak of nanodisks at 53.8°. The sizes of the nanodisks could be managed by adjusting the experimental conditions, such as reaction time, concentration of precursors, and the rate of increase temperature. Results show that the nanodisks are unstable at room temperature.