Facile Synthesis of 1T-MoS<sub>2</sub> Nanoflowers Using Hydrothermal Method

Molybdenum disulfide (MoS 2 ) is one of the promising 2D materials thanks to its outstanding physicochemical properties and therefore is predicted to play a key role in optoelectronics devices and energy applications. MoS 2 exhibits three phases with distinctive crystal structure depending on its stacking order: 1T (metallic), 2H (semiconducting), and 3R (semiconducting). Among all of them, 1T-MoS 2 has become the center of interest due to its e.g., high catalytic activity. However, most of the methods to obtain 1T-MoS 2 are complex and costly, for example strain engineering, electron beam treatment, and plasmonic hot electron injection. As response, we here demonstrate a facile and cost-efficient hydrothermal route at 200 °C to synthesize MoS 2 with high content of 1T phase. MoS 2 -200 °C nanoflowers has an average diameter of 2.96 µm with the S/Mo atomic ratio of 1.50 and the band gap of 1.39 eV. It has an additional diffraction peak at 2θ = 9.22 o , indicating the transformation of semiconducting 2H into metallic 1T. Higher concentration of 1T phase in MoS 2 -200 °C is also indicated by high intensity of the E 1g Raman peak.