Search

Graphene-like WS2 nanosheets at large scale were successfully synthesized via a facile gas-solid reaction route, using tungsten trioxide (WO3) and thiourea as starting materials, and then calcined at 850 °C under N2 atmosphere for 1 h. The final products were characterized by XRD, EDS, SEM and TEM. TEM and SEM images showed that the thickness of the obtained WS2 nanosheets was ~5 nm. The influence of temperature on the formation of WS2 nanosheets was discussed. A possible three-step conversion mechanism of WS2 nanosheets, which including decomposition, sulfurization, and subsequent exfoliation, was proposed to explain the formation of WS2 nanosheets on the basis of observations of a temperature-dependent morphology evolution process.

Three-dimensional (3D) flower-like MoS 2 microspheres with diameter of about 4 μm were successfully synthesized by a facile hydrothermal solution reaction method, using hexaammonium heptamolybdate tetrahydrate ((NH 4 ) 6 Mo 7 O 24 ) and thiourea as the precursors. As-prepared MoS 2 samples were characterized by XRD, EDS, SEM, and TEM. SEM results showed that the obtained 3D flower-like MoS 2 microspheres are comprised of very thin nanosheets with the thickness about 20 nm. The influence of reaction time on the formation of MoS 2 microspheres was investigated. A possible growth mechanism is proposed to explain the formation of MoS 2 microspheres on the basis of observations of a time-dependent morphology evolution process.