Two-dimensional materials have been increasingly investigated over the last decade for their ease of exfoliation from van der Waals’ solids and the drastic change in properties when they transition from bulk to monolayer thickness. Transition metal dichalcogenides (TMDCs) are a prominent class of such materials whose prototypical monolayers have been shown to exhibit various stacking phases, electronic and optical properties, mechanical strength, improved catalytic activity, etc. Equally interesting albeit not so exhaustively explored are alloys of such 2D TMDC materials. This work focuses on monolayer molybdenum tungsten diselenide (Mo1-xWxSe2) alloy. The general properties of single phase TMDC materials are discussed, followed by alloys and their synthesis and investigation of their properties. Finally, two experiments are discussed: the photoluminescence of 2D Mo1-xWxSe2 at low temperatures and the strain induced in-situ structural phase transformation of the alloy.