In conclusion, a new protocol has been developed to produce colloidally stable, monodisperse and size-controlled 1T'-WS2 NMLs with nearly 90% chemical reaction yield. Three different alkanethiols were used as the tungsten coordinating agents, improving the colloidal stability and yield of the reaction by regulating the reactivity of the tungsten precursor. UV-Vis absorption spectroscopy and PXRD confirm that the NMLs produced are 1T'-WS2, and TEM images and SAXS support that the NMLs are well dispersed. A combination of PXRD, TGA, and ligand exchange supports that the surface chemistry is not changed, regardless of the thiol used, and implies that the NMLs are systematically stabilized with oleylamine/oleylammonium ligands. 1T'-WS2 NMLs with different mean sizes (10-60 nm) are then synthesized by changing the amount of thiol and reaction time to regulate the nucleation rate and the tungsten precursor reactivity. This new protocol yields the most stable WS2 monolayers that have been colloidally synthesized to date. We strongly believe this new colloidal protocol paves the way for other studies into the applications of 1T and 2H-WS2, such as electrocatalysis, sensors, and optoelectronic devices. This protocol could also potentially be extended to other group VI TMDCs to produce well-dispersed and sizecontrolled NMLs of all the members of this family.