Preparation of WS2 films with (002) plane preferred orientation and its formation mechanism

Materials with oriented structures exhibit excellent mechanical, electrical, and tribological properties. In this study, WS 2 films with a preferred orientation along the (002) plane were prepared using shear flow technology, and the influence of polyvinyl alcohol (PVA) concentration and wedge angle on the oriented structure of the WS 2 films was systematically studied. The results indicated that the diffraction peak intensity ratio of the (002) and (103) planes of the WS 2 films (I (002) /I (103) ), increased from 46.68 to 116.11 when the PVA concentration increased from 5 to 25 g/L. When the wedge angle increased from 5° to 40°, I (002) /I (103) showed a similar trend, increasing from 80.99 to 347.22. Thus, the higher I (002) /I (103) value confirmed a preferred (002) plane orientation of WS 2 in the films, indicating that an increase in PVA concentration and wedge angle significantly enhanced the shear stress of the slurry. Under shear stress, the WS 2 particles had a tendency to orient along the shear stress direction, forming a preferred (002) plane-oriented structure. Therefore, this research may provide theoretical and technical support for preparing preferred orientation 2D materials .