Temperature effect on structural, morphological and optical properties of 2D-MoS2 layers: An experimental and theoretical study

In this work, we present experimental and theoretical studies of the effect of temperature on the structural, morphological and optical performance of 2D-MoS2 nanosheets. We have used X-ray diffraction, Raman, photoluminescence spectroscopies and electron transmission microscopy to study the structural, morphologic and optical properties of MoS2 synthesized by hydrothermal method. The results indicate that, the structuraland optical properties are significantly temperature-dependent. The number of MoS2-layers has been estimated from the Raman frequencies of the E-2g(1) and A(1g) vibration modes. For the theoretical study we have used k.p and density matrix to calculate the band structure and optical gain for the 2D-MoS2. It is found that the nanosheets exhibit a significant enhancement in the TE-polarized optical gain at room temperature. These results show that 2D-MoS2 layered is promoters for laser device.