The previous WS2 synthetic protocol developed by our group consisted of a slow precursor injection at high temperature, where oleylamine (OAm) was the solvent and a mixture of oleic acid (OA) and OAm were used for the precursors injection. In this case, OAm is crucial for the reaction as it reacts with the sulfur precursor, CS2, during the injection mixture preparation and produces oleylammonium dithiocarbamate, which in turn decomposes at high temperature to oleylammonium sulfide. OA coordinates partially with tungsten hexachloride and regulates the reactivity of this tungsten source. But at high temperatures (depending on the environment, between 200°C to 350°C) OA can decompose or react with oleylamine, yielding water or hydroxides which can induce oxidation of the nanosheets. Hence, to eliminate this partial oxidation of tungsten disulfide, OA should be suppressed from the reaction. In a preliminary experiment, OA is totally suppressed from the protocol and WCl6 is dissolved directly in OAm in the injection mixture. The other synthetic parameters remained the same, with slow injection (30 min) of the precursor mixture at high temperature in OAm.