Monolayer-by-monolayer stacked pyramid-like MoS2 nanodots on monolayered MoS2 flakes with enhanced photoluminescence

Abstract

The precise control of the morphology and crystal shape of MoS₂ nanostructures is of particular importance for their application in nanoelectronic and optoelectronic devices. Here, we describe a single step route for the synthesis of monolayer-by-monolayer stacked pyramid-like MoS₂ nanodots on monolayered MoS₂ flakes using a chemical vapor deposition method. First-principles calculations demonstrated that the bandgap of the pyramid-like MoS₂ nanodot is a direct bandgap. Enhanced local photoluminescence emission was observed in the pyramid-like MoS₂ nanodot, in comparison with monolayered MoS₂ flakes. The findings presented here provide new opportunities to tailor the physical properties of MoS₂via morphology-controlled synthesis.