Phase transformation of 2D transition metal (TM) dichalcogenides during the in-situ high-temperature heating

Two-dimensional (2D) TM dichalcogenides demonstrate exceptional electronic and optical properties.  A previous study by researchers from the University of Pennsylvania on a few layers of 2D MoS2 has shown multiple phases with atoms occupying orientations within single/multiple layers (see npj 2D Materials and Applications here).

Here, the same group study different thin 2D dichalcogenide material and observe a unique conversion of phases from the parent crystalline substrate. The conversion is initiated when the temperature of the sample reaches around 500°C. The diffusion velocity of the new phase is dependent upon the stimulus applied to the sample.

Data provided by Pawan Kumar, Eric Stach and Deep Jariwala from the University of Pennsylvania.