The Transformation Pathways of Mo6S2I8 Nanowires into Morphology-Selective MoS2 Nanostructures

Nanomaterials prepared by the sulfurization of Mo6S2I8 nanowires and the time and temperature dependence of the transformation process are investigated by high-resolution transmission electron microscopy. X-ray powder diffraction, and wavelength-dependent Raman spectroscopy Depending on the temperature, coaxial MoS2 nanotubes or MoS2 "mama"-tubes are formed after 2 h of sulfurization. Using a few minutes of sulfurization time. core shell nanowires composed of well-ordered MoS2 layers covet mg a Mo6S2I8 core are formed, proving an outside-to-inside transformation process The crystallinity of the three MoS2 nanostructures increases with Increasing transformation temperature, i.e., in the sequence from MoS2/Mo6S2I8 core-shell structures via coaxial MoS2 tubes to the MoS2 "mama"-tubes. The analysis indicates a different nature of the defects in the MoS2-based nanomaterials, originating from the sulfurization of the Mo6S2I8 than in the conventional MoS2 platelike crystals A correlation between the Raman spectroscopic parameters and the defect density in MoS2 is identified.