Colloidal Synthesis Protocol of Shape- and Dimensionally-Controlled Transition-Metal Chalcogenides and Their Hydrodesulfurization Activities

We present a single-step ligand-directed colloidal synthesis protocol for the selective growth of dimensionally-and shape-controlled niobium disulfide (NbS2) nanostructures. A systematic modulation of the reaction conditions resulted in the development of monolayer nanosheets, which alternatively grew as laterally confined (<100 nm) 2D nanostructures using an appropriate mixture of coordinating ligands with different functional groups. The lateral size reduced to similar to 50 nm by increasing the amount of a chalcogen source (carbon disulfide, CS2), which promoted planar growth to form OD nanohexagons and 1D hexagonal nanorods. A noncoordinating solvent suppressed anisotropic growth and resulted in the formation of OD nanospheres. Nanohexagons with the highest fraction of corner and edge active sites delivered the highest activity in dibenzothiophene hydrodesulfurization.