E’’ Raman Mode in Thermal Strain-Fractured CVD-MoS 2

摘要

Molybdenum disulfide (MoS 2 ) has recently attracted considerable interests due to its unique properties and potential applications. Chemical vapor deposition (CVD) method is used widely to grow large-area and high-quality MoS 2 single crystals. Here, we report our investigation on thermal strain-fractured (SF) single crystalline MoS 2 , oxidation-fractured MoS 2 , and normal MoS 2 by atomic force microscopy (AFM), Raman and photoluminescence (PL) measurements. Several new Raman modes are observed for SF-MoS 2 . The band gap of SF-MoS 2 is enlarged by 150 meV and the PL intensity is reduced substantially. These results imply that a structural transformation occurs in SF-MoS 2 . Our findings here are useful for the design of MoS 2 -based nanocatalysts with relative high catalytic activity.