Synthesis And Performance Study Of MoS₂ Micro/Nano- Spheres And MoS₂@ ZnO Nano-heterostructures

In this paper, the combinations of hollow MoS₂ micro@nano-spheres were fabricated through a one-tep hydrothermal route. Thioacetamide （C₂H₅NS） and sodium molybdate （Na₂MoO₄.2H₂O） were as Mo and S sources, respectively. Based on experimental facts, the formation mechanism of the hollow micro@nano-spheres is depicted. Its photocatalytic activities were measured. The hollow MoS₂ micro@nano-spheres, the efficient photocatalyst, can effectively degrade MB. Furthermore, the humidity sensing performances of the MoS₂-based sensors were investigated for the first time and the results indicate that the sensors possess pronounced sensitivity in high RH environment, very small humidity hysteresis, fast response and recovery time, and good stability. Moreover, MoS₂ nanoflowers and ZnO nanoparticles were fabricated via the hydrothermal route. The influence of different S sources on the MoS₂ morphology was discussed. Furthermore, MoS₂@ZnO nano-heteroj unctions were successfully synthesized fabricated and its photocatalytic activities and field emission properties were measured. The innovations of main contents are as follows:1. The combinations of hollow MoS₂ micro@nano-spheres were fabricated through a one-tep hydrothermal route. Thioacetamide （C₂H₅NS） and sodium molybdate （Na₂MoO₄.2H₂O） were as Mo and S sources, respectively. And the oxalic acid （H₂C₂O₄） was used to adjust the pH value. The hollow MoS₂ micro@nano-spheres are composed of microspheres and nanospheres with the diameters of ～1 μm and ～200 nm, respectively. Every microsphere is dispersedly surrounded by nanospheres. Based on experimental facts, the growing process of the hollow micro@nano-spheres is depicted.2. The humidity sensing performances of the MoS₂-based sensors were investigated for the first time and the results indicate that the sensors possess pronounced sensitivity in high RH environment, very small humidity hysteresis, fast response and recovery time, and good stability.3. MoS₂ nanoflowers and ZnO nanoparticles were fabricated via the hydrothermal route. The influence of different S sources on the MoS₂ morphologies was discussed. Furthermore, MoS₂@ZnO nano-heterojunctions were successfully synthesized fabricated. ZnO nanoparticles tightly adhered to the upper surfaces, lower surfaces, the edges and inner space of the MoS₂ nanopetals, increasing the specific surface area and tips.4. The photocatalytic activities and field emission properties of MoS₂ nanoflowers and MoS₂@ZnO nano-heterojunctions were measured. Compared with MoS₂ nanoflowers, MoS₂@ZnO nano-heterojunctions possess enhanced photocatalytic activities and field emission properties due to the increased specific surface area and heterojunction structure.