Preparation and Characterization of MoS_2 Microsphere by Hydrothermal Method

摘要

In this work, MoS_2 microsphere was synthesized by hydrothermal reaction, in which thiourea (CS(NH_2)_2) was used as S-source and reducing agent, ammonium heptamolybdate ((NH_4)_6Mo_7O_(24.4)H_2O) was used as Mo-source. The influence of temperature, as well as different dispersing agents, on the reaction product's morphology, structure and phase composition was discussed. X-ray diffraction results show that all the as-synthesized products are the hexagonal 2H-MoS_2 without impurity. SEM images of the as-prepared MoS_2 samples without adding any dispersing agent present spherical morphology with sheet-like structures shaped on the surface. A possible formation mechanism of the MoS_2 microsphere is that of self-assembly growth process; In addition, for the samples adding surfactant CTAB, SDBS or PVP in the reactants, the MoS_2 is confined to layered structure. Compared with SDBS and PVP, CTAB has the best dispersion effect which ensure the as-synthesized microsphere with about 300 nm average diameter, and the influence mechanism of which can be deduced as electrostatic interaction and stereo-hindrance effect.