Hydrothermal Synthesis of Metal Sulfides (MS2; M = Mo and W) Nanostructures with their Structural and Optical Properties

Transition metal disulfides (MS2; 2 ; M = Mo and W) nanostructures were successfully synthesized by a hydrothermal methodology based on the reaction between transition metal (Mo/W) and S sources at 240OC O C for 24 hours. Detailed structural, morphological and optical analyses were performed using XRD, TGA/DSC, FESEM/EDX, HRTEM and UV-Vis spectroscopy. Gross structural investigations reveal that the crystalline nature of MS2 2 materials with flake-like and rod-like morphologies. MoS2 2 in 2D flake-like morphology with thickness of about 15 nm (+/- 2nm) +/- 2nm) and WS2 2 in 1D rod-like morphology with width between 7-9nm (+/- 0.5nm) +/- 0.5nm) were achieved. The UV-Vis spectroscopy data elucidate two different optical band gaps 1.88 eV and 2.29 eV were achieved for MoS2 2 nanoflakes, and for WS2 2 nanorods it was 1.84 eV. The simple and cost-effective synthesis approach with detailed microstructure analyses and optical properties indicate a great potential of nanostructured MoS2 2 and WS2 2 as a vital component in new-generation semiconductor and optoelectronics devices.