In the original protocol, OA has been used to form a tungsten oleate complex that regulate the reactivity of the tungsten precursor. This preliminary experiment highlights the strong dependence of this WS2 colloidal synthesis on the precursor activity. Strong activity leads to aggregated 2H-WS2 whereas lower precursors activity can lead to 1T'-WS2 monolayers or polymorphic samples if the activity is not low enough. As a conclusion, an oxygen-free coordinating agent is needed to coordinate further with tungsten hexachloride and regulate the reactivity of the tungsten precursor to improve the dispersion and produce pure 1T' monolayers.