Layered transition metal dichalcogenides (TMD) have attracted significant research attention due to their potential application in electronics and optoelectronics devices. Monolayer molybdenum disulfide (MoS2) is 0.65 nm thick and is similar to graphene, except that it is a direct gap semiconductor. Figure 8: Structure of 2D molybdenum disulfide (Source: Wang et al. / MIT). Properties